Sslc science question bank 2014 cmpiled by d n manjunath bhatt nrpura

Science Question Bank Science Question Bank

Science Question Bank

Science Question Bank

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SCIENCE MULTIPLE CHOICE QUESTIONS [Compilation By D N MANJUNATH, G.P.U.College, Narasimharajapura] 1. “A current carrying conductor experiences a mechanical force in a magnetic fielD.” The device which works on this principle is a/an A. electric motor B. A.C. dynamo C. D.C. dynamo D. commutator.

2. ‘Volt’ is the unit of which of the following quantities ?

A. Electric current and potential difference B. Potential difference and electromotive force C. Electromotive force and electrical resistance D. Electrical resistance and electric current.

3. Dr. Sahana has to treat her patient who is suffering from rickets. The electromagnetic radiation to be used for this treatment is A. ultraviolet radiations of high frequency B. infrared rays of high frequency C. ultraviolet radiations of low frequency D. infrared rays of low frequency.

4. North pole of a bar magnet is continuously thrust in and pulled out of the coil of conductor connected to a galvanometer several times, then the pointer of the galvanometer A. remains at zero B. deflects on either side of the zero C. moves towards the left side of the zero D. deflects towards the right side of the zero.

5. A reverse biased p-n junction offers a high resistance, because A. charge carriers flow across the junction B. the cell used supplies direct current C. charge carriers flow in the same direction D. charge carriers are repelled away from the junction.

6. The two major parts in total radio broadcasting system are A. microphone and mixer B. speaker and detector C. transmitter and receiver D. speaker and receiving antennA. 7. If there is voltage fluctuation in domestic circuit, the device that you use to regulate voltage in an electrical appliance is A. a transducer B. an oscillator C. a diode D. a detector.

8. A cyclist while going round a curve leans towards the centre of the curve to get necessary A. centrifugal force B. centripetal force C. gravitational force D. centrifugal reaction.

9. The device that can be fitted to the engine of a bus to prevent the driver from driving it with overspeed is A. centrifugal pump B. centrifuge C. centrifugal drying machine D. centrifugal governor.

10. For a satellite orbiting the earth, centripetal force is provided by A. the place of launch B. gravitational force C. the size of the satellite D. mass of the satellite.

11. The value of ‘g’ A. does not depend on the mass of the object B. is proportional to the mass of the object C. does not depend on the mass of the earth D. does not depend upon the radius of the earth.

12. A cyclist riding a cycle fitted with a dynamo to a tyre gets bright light in the bulb connected, when he pedals fast. This is because, A. magnet becomes powerful, when wheel rotates faster and current flows fast B. current flows easily when cycle goes fast C. more magnetic lines of force change with respect to the coil and leading to more current D. coil becomes hot due to friction and produces more current.

13. A person wrongly uses infrared rays to detect a flaw in a machine part. The correct radiation he should be using is, A. X-ray B. ultra-violet ray C. micro-wave D. visible light.

14. The factor that does not contribute for the dispersion of light in a glass prism, is A. the prism is transparent B. double refraction takes place C. light gets reflected by the prism D. white light is made of several colours.

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15. A student wants to get a band of distinct seven colours occupying their respective positions using a glass prism. The device that he can select for this purpose is a A. Telescope B. Spectroscope C. Microscope D. Binocular.

16. Doppler effect in sound is observed as a change in its A. pitch B. velocity C. amplitude D. speeD. 17. The ultrasound signal sent in water by sonar takes 3 seconds to return. If the velocity of sound in water is 1·5 kms/sec, the distance travelled by the signal is A. 2·25 kms B. 4·5 kms C. 6 kms D. 9 kms.

18. The red shift of galaxies show that the A. universe is contracting B. galaxies are coming towards us C. velocity of light changes D. universe is expanding.

19. The matter that streams out of the sun’s surface in bursts like thunderstorms is A. granulation B. spicule C. solar flare D. solar prominence.

20. The magnitudes of four stars P, Q, R and S are respectively 0, – 5, + 5 and – 10. The brightest star among them is A. S B. R C. Q D. P. 21. Machine parts in an industry are to be checked for defects. The radio-isotope used for this purpose is A. Radio-Iodine B. Radio-Iridium C. Radio-Carbon D. Radio-Phosphorous.

22. Which of the following has 146 neutrons ?

A. 92 U 235 B. 88 Ra 226 C. 86 Rn 222 D. 92 U 238 23. Tritium nucleus contains A. three protons B. one proton and two neutrons C. two protons and one neutron D. three neutrons.

24. The light absorbing material used in a solar cell is A. silicon B. phosphorous C. carbon D. radium.

25. The technique which established that the sun is made of mostly hydrogen is A. spectrum analysis B. chemical analysis C. scanning D. laser ranging.

26. The fuel used in gobar gas plant is A. animal dung B. firewood C. coal D. charcoal.

27. Brass, German silver and Gunmetal are the alloys of copper. Apart from copper the other common metal in them is A. zinc B. tin C. iron D. nickel.

28. You are required to arrange Fe, Zn and Mg in the increasing order of their reactivity.The correct arrangement is A. Mg, Zn, Fe B. Fe, Mg, Zn C. Fe, Zn, Mg D. Zn, Mg, Fe. 29. Sodium aluminium silicate is also called A. washing soda B. silicone C. water glass D. zeolite.

30. Name of this structure is A. propyne B. propane C. cyclopropane D. propene.

31. During the extraction of silicon from quartz, unchanged silica is removed by using A. Hydrochloric acid B. Hydrofluoric acid C. Nitric acid D. Sulphuric aciD. 32. The permitted level of emission of carbon monoxide of my vehicle is 3%. My vehicle is A. a scooter B. a lorry C. an auto-rickshaw D. a car.

33. The chemical which is mixed with L.P.G. to detect the leakage of the gas is A. Methyl Mercaptan B. Benzyl Mercaptan C. Ethyl Mercaptan D. Propyl Mercaptan.

34. During the manufacture of glass, molten glass is cooled slowly to make it A. more brittle B. colourful C. withstand high temperature D. lose brittleness.

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35. The polymer that can be used as gasket of a pressure cooker is A. Thiokol B. Teflon C. nylon D. neoprene.

36. Raw materials used in the manufacture of cement are A. clay and washing soda B. clay and limestone C. washing soda and limestone D. calcium silicate and clay.

37. Which of the following is a soap ?

A. Sodium sulphate B. Sodium stearate C. Sodium chloride D. Sodium nitrate.

38. Which among the following is not a method of conservation of water ?

A. Growing trees and conserving soil B. Using improved method of farming C. Removing the forests and constructing lakes D. Collecting the roof water and using it.

39. During the preparation of soap the liquid separated by distillation is A. sodium hydroxide B. oil C. stearic acid D. glycerol.

40. Two chambered heart is found in A. pisces B. amphibians C. reptiles D. aves.

41. Which one of the following is deliberate adulteration ?

A. Coating of pesticides on fruits B. Rice like stones in rice C. Grass in coriander D. Dust in foodgrains.

42. Prothallus is an independent structure of A. gametophyte of bryophytes B. sporophyte of bryophytes C. gametophyte of pteridophytes D. sporophyte of pteridophytes.

43. Embryonic cells which always divide and form new cells are found in A. meristem B. parenchyma C. collenchyma D. sclerenchymA. 44. Which one of the following is an imperfect cycle ?

A. Carbon cycle B. Oxygen cycle C. Phosphorus cycle D. Nitrogen cycle.

45. The type of leaf venation shown in the figure is found in plants of A. ragi B. mustard diA. C. wheat D. maize.

46. While developing a good public hospital, the management gives priority to A. large open field around the hospital B. parking space for all types of public vehicles C. a garden with good number of shady trees D. space for caterer who supply food at cheap rates.

47. Epithelium tissue in Alveoli and blood capillaries referred as endothelium is A. columnar epithelium B. squamous epithelium C. ciliated epithelium D. cuboid epithelium.

48. Adulteration of food means A. processing of food B. transportation of food C. storage of food D. removing nutritive value of fooD. 49. Denitrification is the process of A. fixing nitrogen in the soil B. changing proteins into ammonium salts C. conversion of ammonium salts into nitrates D. changing nitrates into free nitrogen.

50. Due to low secretion of insulin in the body, a person will have A. low blood pressure B. high blood pressure C. high sugar level in the blood D. low sugar level in the blooD. 51. Now the government policy is to discourage use of plastic bags. The scientific reason for this is that they are A. non-biodegradable but non-toxic B. biodegradable C. non-biodegradable D. biodegradable but toxiC. 52. One of the main symptoms of Hepatitis-B is A. body weight loss B. profuse sweating C. burning sensation in trachea D. indication of jaundice.

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53. When concentrated nitric acid is added to a sample of cooking oil to detect the adulteration it turns A. yellow in colour B. black in colour C. reddish brown in colour D. yellowish brown in colour.

54. Production of genetically similar organisms inside or outside the body is A. tissue culturing B. cloning C. genetic engineering D. recombinant DNA technology.

55. The tissue that helps in defence of the body by engulfing bacteria and digesting toxic substances is A. adipose tissue B. reticular tissue C. areolar tissue D. cartilage tissue.

56. Cerebrum controls which one of the following functions ?

A. Reasoning B. Mastication C. Walking D. Vomiting.

57. HIV ultimately destroys which one of the following ?

A. Liver and pancreas B. Production of proteins C. Defence mechanism D. Enzyme secretion.

58. Genetic relation between a father and a son is determined by a technique of A. genetic engineering B. DNA fingerprint technology C. tissue culturing D. cloning.

59. The outermost layer of the eyeball is A. conjunctiva B. sclera C. choroid D. retinA. 60. An HIV positive mother should not A. kiss the child B. breast-feed the child C. carry the child D. bathe the chilD. 61. The frequency of a radiowave, having a wavelength of 300 m is A. 10 6 Hz B. 10 6 kHz C. 10 6 km D. 10 6 m.

62. In the radio transmission the process of superimposing A.F. signals on R.F. wave is called A. modulation B. demodulation C. rectification D. amplification.

63. Which one of the following is an application of centrifugal reaction ?

A. Separating butter from curds with a churner B. Separation of petroleum products C. Concentration of haematite ore D. Drying clothes in sun.

64. If a string whirling with a stone snaps, then the motion of the stone will be A. in the direction of the circular motion B. towards the centre of the circular path C. tangential to the circular path D. opposite to the direction of the circular path.

65. If the distance between two heavenly bodies increases by two times then the gravitational force between them A. decreases by 4 times B. increases by 4 times C. decreases by 12 times D. increases by 2 times.

66. Which one of the following is true if an object is falling freely under gravity ?

A. Its mass decreases B. It experiences weightlessness C. Its weight increases D. Its mass becomes zero.

67. Rayleigh scattering of light is called coherent because A. there is change in the wavelength of light B. there is change in the frequency of light C. there is no change in the wavelength of light D. there is change in both frequency and wavelength of light.

68. While studying Raman effect, a person uses light from the fluorescent lamp. To correct this mistake, he must use light from the source, A. tungsten filament lamp B. sun C. sunlight passed through a lens D. monochromatic sodium vapour lamp.

69. Rainbow is an example for the spectrum of the type A. pure B. impure C. line emission D. line absorption.

70. Ultrasound signal sent by a sonar situated at the surface of ocean takes 6 seconds to return from the floor of the ocean. The depth of the ocean floor is A. 4路5 km B. 0路45 km C. 9路5 km D. 45 km.

71. The radar gun used by traffic police to detect the overspeeding vehicles, works on the principle of Doppler effect. The wave used is A. Radiowave B. Soundwave C. Visible light D. UltrasoniC.

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72. The colour of the star having highest temperature is A. red B. yellow C. yellowish white D. bluish white.

73. Relatively low temperature regions on the surface of the sun are caused by A. magnetic activities below photosphere B. thermonuclear fusion reaction C. nuclear fission reaction D. ionisation of gases.

74. In the evolution of stars, heavy elements like iron are formed during the stage, A. Protostar B. Red giant C. Steady state D. SupernovA. 75. 100 X 300 is a radioactive element. It transmutates into element Y after emitting an alpha particle.

The element Y can be written as A. 101 Y 300 B. 102 Y 296 C. 98 Y 296 D. 98 Y 304 .

76. The moderator in a nuclear plant is usually made of A. graphite B. cadmium C. water D. sodium.

77. Radiation hazard may cause the disease, A. Leukemia B. Cholera C. Typhoid D. Night blindness.

78. In a solar water heater the copper pipe is painted black because it helps A. in better absorption of light B. to prevent corrosion C. to radiate heat to the surrounding D. in the absorption of heat by water.

79. The reason for the enormous output of energy from the sun is A. combustion of hydrogen gas B. fission of helium nuclei C. fusion of hydrogen nuclei D. friction between hydrogen atoms.

80. Which one of the following is a method of increasing the weight of the body on earth without changing the mass ?

A. Taking the body to the poles B. Powdering the body C. Cooling it below 0째C D. Magnetising the body.

81. Now-a-days people prefer to use compact fluorescent tube more because A. they can be easily produced B. they save electrical energy C. they are produced in the small scale industries D. they give more light with less heat.

82. Which of the following ores is a carbonate ore of iron ?

A. Haematite B. Magnetite C. Limonite D. Siderite.

83. The best combination of metal and an acid to prepare hydrogen gas is A. copper and nitric acid B. copper and dilute hydrochloric acid C. zinc and dilute hydrochloric acid D. copper and dilute sulphuric aciD. 84. In the extraction of amorphous silicon, magnesium is used as a reducing agent. The product is washed with hydrofluoric acid, to remove A. extra magnesium B. unchanged silica C. amorphous silicon D. extra quartz.

85. Though silicon is a non-metal, when warmed it becomes a semiconductor due to A. electrons released by breaking of covalent bonds B. electrons released by breaking of ionic bonds C. movement of electrons of innermost orbitals D. formation of covalent bonds.

86. An officer during an emission test on a car, detects more than 10% of carbon monoxide.

This could be due to A. the quantity of oxygen supplied is more B. heat released is more C. complete combustion of fuel D. incomplete combustion of fuel.

87. A benzene ring structure could be changed to toluene by A. adding CH 3 group B. replacing H by CH 3 group C. replacing H by CH group D. adding NO 2 group.

88. A manufacturer of cooking utensils wants to fix plastic handles to them. The plastic he can select is A. PVC B. Polythene C. Bakelite D. Nylon.

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89. The gaseous product released during the manufacturing of soda glass is A. Carbon dioxide B. Sulphur dioxide C. Nitrogen dioxide D. Nitric oxide.

90. Cement containing higher percentage of gypsum than required, A. sets slowly B. sets rapidly C. does not set at all D. gets higher strength.

91. The ion which can be removed by Permutit process is A. Lead B. Calcium C. Iron D. Manganese.

92. The by-product of the process of saponification is A. Methanol B. Glycol C. Glycerol D. Sodium hydroxide.

93. In the process of preparation of detergents, the organic acids produced are neutralized with A. sodium hydroxide B. sodium sulphate C. sodium chloride D. sodium nitrate.

94. The plant that possesses Reticulate Venation is A. Paddy B. Mustard C. Ragi D. Jowar.

95. An example for Pteridophyta is A. Adiantum B. Funaria C. Riccia D. MarchantiA. 96. The number of chambers in the heart of tortoise is A. two B. three C. four D. five.

97. The type of epithelial tissue found in the inner layer of the small intestine is A. Squamous epithelium B. Columnar epithelium C. Ciliated epithelium D. Cuboidal epithelium.

98. Meristematic tissue is not found in A. Bark B. Root tip C. Stem apex D. Buds.

99. The tissue which gives shape, support, protection and helps in movement is A. Epithelial tissue B. Muscular tissue C. Bone tissue D. Nervous tissue.

100. In nervous system, spinal nerves are the basic components of A. central nervous system B. peripheral nervous system C. sympathetic system D. para-sympathetic system.

101. The excess secretion of growth hormone in adults causes A. Acromegaly B. Gigantism C. Dwarfism D. Cretinism.

102. The part of the inner ear, concerned with balancing of the body is A. Utriculus B. Sacculus C. Cochlea D. Organ of Corti.

103. HIV is covered with double layered membrane which is made up of A. Carbohydrates B. Fats C. Proteins D. Minerals.

104. HIV is transmitted by A. sharing food with AIDS patient B. shaking hands with AIDS patient C. using common toilets D. sharing unsterilized syringes used by AIDS patient.

105. The part of the digestive system which is affected by Hepatitis-B, is A. Stomach B. Pancreas C. Intestine D. Liver.

106. Food adulteration means A. weighing less quantity B. adding substances of inferior quality C. adding more vital components D. weighing with polythene cover.

107. Which is an accidental adulteration ?

A. Stones in rice B. Talcum powder in wheat flour C. Jaggery in honey D. Vegetables with traces of insecticides.

108. The common adulterant found in Red Chilli powder is A. coloured saw dust B. used tea powder C. metanil yellow D. papaya seeds powder.

109. A biotic component of environment is A. Bacteria B. Water C. Air D. Soil.

110. The organism that does not involve directly in the fixation of nitrogen, is A. Anabaena B. Diatom C. Nostoc D. Leguminous plant.

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111. The gaseous pollutant, more responsible for acid rain, is A. sulphur dioxide B. carbon dioxide C. carbon monoxide D. nitrogen oxide.

112. The biodegradable pollutant is A. DDT B. glass C. wood D. plastiC. 113. The world’s first clone is A. Sheep B. Hen C. Cow D. Buffalo.

114. The type of Biotechnology applied in Forensic Science is A. Genetic Engineering B. DNA fingerprint technology C. Tissue culture D. Cloning.

115. The important application of electromagnetic radiation of wavelength 400 mm to 750 mm is, A. sterilization B. to detect fracture of bones C. photosynthesis D. to detect artificial gems 116. In the device used in exposure meters the electrons are ejected by the following energy A. heat energy B. friction energy C. chemical energy D. light energy 117. If the efficiency of a heat engine which uses 800 kJ heat energy to do a work is 40%. Then the loss of heat energy is, A. 320 kJ B. 480 kJ C. 200 kJ D. 400 kJ 118. The device used in separating proteins, harmones, viruses from a liquid medium is A. Fractionating column B. Centrifugal governor C. Centrifuge D. Filtration apparatus.

119. Doppler effect of light can be applied in the study of the following A. The velocity of submarines B. Speed of galaxies C. Pollutants in the atmosphere D. Crystal structure.

120. An example for a reaction in which the nucleus of an atom undergoes change is A. Photosynthesis B. Combustion of carbon in air C. Reaction of Sodium in water D. Fission chain reaction of uranium.

121. 2C4H10 + 13O2 → 8CO2 + 10 H2O + Energy. In this reaction the mass of oxygen required for the complete combustion of one mole of butane is A. 16 B. 416 C. 208 D. 32 122. The acid related to the preparation of detergent is A. Stearic acid B. Hydrochloric acid C. Nitric acid D. Sulphuric acid 123. The following is not used to manufacture soap, A. Coconut oil B. Kerosine oil C. Castor oil D. Palm oil.

124. Cement is used as building material because it A. is a good binding agent B. sets rapidly C. is prepared from cheap raw materials D. withstands high temperature.

125. Which of the following group of plants bear Inflorescence.

A. Bryophytes B. Pteridophytes C. Gymnosperms D. Angiosperms 126. The egg shell of birds may break easily if one of the following is insufficient.

A. Magnesium carbonate B. Ferrous sulphate C. Calcium carbonate D. Calcium bicarbonate.

127. One of the main function of Parenchyma tissue is, It A. Supports other tissues B. Takes part in Photosynthesis

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C. Gives tensile strength to the plant body D. Conducts water to different parts of the plant body.

128. The function of Adipose tissue can be compared to, Heat A. Regulator B. Insulator C. Conductor D. Generator 129. Which of the following life processes may be affected if the two cells around the stomata not function.

A. Respiration and Growth B. Transpiration and Respiration C. Respiration and Reproduction D. Transpiration and Food conduction.

130. In an external combustion engine the part which converts linear motion into rotation is A. crankshaft B. cylinder C. piston D. connecting roD. 131. The efficiency of diesel engine is usually expressed as A. heat supplied B. work done × 100 C. work done × 100 D. work done work done heat supplied heat released heat released

132. Kiran who is reading in the classroom finds out whether a teacher is coming near the classroom or not even if he cannot see the teacher. It is because he A. knows about sonar B. knows about ultrasonics C. is aware of Doppler effect D. knows about frequency and wavelength.

133. The ill-effect experienced by the people of Japan even today after the explosion of atom bomb during Second World War is A. Premature cataract B. Skin cancer C. Genetic disorder D. Hepatitis.

134. When X-rays are passed through a body one can know about broken bones because A. bones are opaque to X-rays B. X-rays give pain when fallen on the broken part C. the broken part of the bone shines D. the broken part of the bone vibrates when X-rays fall on it.

135. In modern drinking water purifiers bacteria-free water is obtained by which of the following electromagnetic radiations ?

A. Radio waves B. Ultraviolet rays C. Gamma rays D. X-rays.

136. Emission test should be conducted for vehicles which use liquefied petroleum gas to detect which poisonous gas ?

A. Carbon dioxide B. Sulphur dioxide C. Carbon monoxide D. Nirogen dioxide.

137. Lead glass is used in the preparation of lenses because it has good transparent nature in addition to which of the following properties ?

A. It has high refractive index B. It can withstand stress C. It can tolerate variation of temperature D. It is light and strong.

138. Another chemical substance that should be heated with fatty oil in the manufacture of soap is A. Sodium chloride B. Sodium sulphate C. Calcium sulphate D. Sodium hydroxide.

139. Sodium N-dodecyl Benzene Sulphonate, which is prepared from petroleum, can A. produce scum in hard water B. clean in hard water C. not cause water pollution D. remove salt from water.

140. A plant which has multicellular cone like structure is A. Angiosperm B. Gymnosperm C. Bryophyte D. Pteridophyte.

141. An animal tissue structured to engulf micro-organism and foreign bodies is A. Connective tissueB. Areolar tissue C. Adipose tissue D. Bone tissue.

142. The part of the brain which controls mastication and facial expression is A. Cerebrum B. Cerebellum C. Pons D. Hypothalamus.

143. A person has defective teeth and protruded tongue. This is due to the hypo-secretion of the hormone namely A. Thyroxine B. Parathormone C. Insulin D. Glucagon.

144. In a protected forest if all the carnivores are transferred, then the significant change would be A. increase in vegetation B. decrease in vegetation C. no change in the number of herbivoresD. tourism will improve.

145. The photograph of the dense material in the human body is to be taken. The characteristic of the rays used for this purpose is A. low frequency B. higher wavelength C. short wavelength D. less velocity than light.

146. Metal sheet A is exposed to one type of radiation and metal sheet B is exposed to another type of radiation. The velocity of the photoelectrons emitted by A is more than that of B. Then which one of the following possibilities is true ?

A. A is exposed to visible light and B to ultraviolet rays B. A is exposed to ultraviolet rays and B to visible light C. A is exposed to infrared rays and B to X-rays D. A is exposed to radio waves and B to gamma rays.

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147. When creamy curd is churned in a centrifuge the butter particles congregate at the centre of the rotating medium. This is because A. butter particles experience greater centrifugal reaction B. butter particles experience less centrifugal reaction C. butter particles experience no centrifugal reaction D. butter particles and the particles of the medium experience the same centrifugal reaction.

148. A traffic police has to detect the vehicle crossing the speed limit. Which of the following units is related to the characteristic of the wave used ?

A. hertz B. parsec C. angstrom D. newton.

149. The remnant at the end of supernova of a star with mass 30 times that of the sun gets compressed to a small volume. Then it is a A. White dwarf B. Pulsar C. Neutron star D. Black hole.

150. The process of converting benzene to toluene is by the substitution of A. CH2 in place of C B. CH2 in place of H C. CH3 in place of C D. CH3 in place of H. 151. An automobile owner should prefer C4H10 to C8H18 as a fuel, because C4H10 has a A. low molecular mass and is more volatile B. high molecular mass and is more volatile C. high molecular mass and is less volatile D. low molecular mass and is less volatile.

152. A supervisor in a factory forgets to add gypsum to cement while manufacturing cement. If the cement so produced is mixed with water, then it A. sets slowly B. sets rapidly C. loses setting property D. loses its colour slowly.

153. Detergent mixed water should not be allowed to mix with river water, because, detergents are A. lather producer with water B. bio-degradableC. non-biodegradable D. insoluble in water.

154. During saponification, the method of separating glycerol is A. filtration B. crystallization C. distillation D. decantation.

155. A vertebrate having a diaphragm is A. Seahorse B. Ichthyophis C. Pigeon D. Bat. 156. The part of an eye responsible for the colour of the eye is A. Vitreous humour B. Aqueous humour C. Iris D. CorneA. 157. A person has watery fluid collected in some parts of the body with paralysed limbs. This is the symptom of the disease A. Simple goitre B. Myxedema C. Dropsy D. Diabetes.

158. The possibility of developing Jaundice is high in the Hepatitis-B patient. This is because A. the bilirubin discharged from the liver is released to the blood B. W.B.C.s in blood turn to yellow colour C. platelets undergo chemical reaction causing Jaundice D. the quantity of serum increases in the blooD. 159. The scientist who developed the world’s first clone of sheep is A. Edward Jenner B. Wilmut C. Louis Pasteur D. Robert Hooke.

160. It is a good practice to make children play for sometimes in the morning sunlight. By this practice body gains A. Vitamin B B. Vitamin C C. Vitamin D D. Vitamin A. 161. The distance between moon and the earth can be determined by which of the following techniques A. Laser ranging B. Radiography C. Sonar D. Holography.

162. In which of the following strokes of the working of an internal combustion engine the inlet valve is closed and the outlet valve is open ?

A. Intake stroke B. Compression stroke C. Power stroke D. Exhaust stroke.

163. One disadvantage of internal combustion engine is A. it has low efficiency B. there are chances of break-down of engine C. it releases more carbon monoxide D. it releases more carbon dioxide.

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164. Under which of the following circumstances it is more suitable to use ultrasound scanner ?

A. To find fractured bone B. To detect the metallic articles in a suitcase C. To study the working of heart D. To find the defects of teeth.

165. The number of hydrogen atoms that should be removed from butane to make it butene is A. 2 B. 4 C. 6 D. 8.

166. Which of the following raw materials do you select to reduce the cost of manufacturing soap ?

A. Crude oil B. Coconut oil C. Groundnut oil D. Non-edible vegetable oil.

167. Raw materials used in the manufacture of detergents are A. vegetable oil, sodium hydroxide, long chain hydrocarbon B. long chain hydrocarbon, sodium hydroxide, sulphuric acid C. long chain hydrocarbon, vegetable oil, sulphuric acid D. vegetable oil, sodium hydroxide, sulphuric aciD. 168. Pre-matured cataract in human beings is caused by A. radiowaves B. ultrasonics C. infrared rays D. ultravoilet rays.

169. The bending of black absorber pipe in the form of coil in solar water heater A. increases the efficiency B. enables water to flow easily C. retains water for long time in the pipe D. increases area of absorption.

170. Which one of the following contains xanthophyll in excess ?

A. Polysiphonia B. Ectocarpus C. Spirogyra D. Ulothrix.

171. Individual can be identified using A. DNA fingerprint technology B. Recombinant DNA technology C. Genetic engineering D. Cloning technique.

172. A person is advised vitrectomy surgery. The gland which is not functioning properly is A. thyroid B. islet of Langerhans C. gonads D. adrenal.

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173. Fill in the box selecting the appropriate life process : C O, Death Plants, Animals A. Respiration B. Nutrition C. Growth D. Reproduction.

174. A person stammers. Part of the brain affected is A. thallamus B. hypothalamus C. cerebellum D. cerebrum.

175. A, B and C are the three coils of conductor having different number of turns, wound around a soft iron ring as shown in the figure. Ends of coils B and C are connected to the galvanometers. The observation that can be made when ends of coil A are connected to an A.C. source is A. same electric current is induced in B and C B. no electric current is induced in B and C C. induced electric current is more in B than in C D. induced electric current is less in B than in C.

176. The induced electromotive force increases when a magnet is moved fast in a stationary coil of wire because, A. magnetic field increases B. rate of change of magnetic field increases C. rate of change of magnetic field decreases D. magnetic field decreases.

177. A photoelectric cell emits electrons when illuminated by a 60 W bulB. If the same cell is illuminated by replacing it with a 40 W bulb, the observation that can be made is A. no photoelectric effect takes place B. number of photoelectrons increases C. the kinetic energy of photoelectrons decreases D. number of photoelectrons decreases.

178. The defect in an engine is detected by using X-rays. The gamma radiation can also be used for the same purpose because gamma radiation has, A. higher frequency than X-ray B. same frequency as that of X-ray C. higher wavelength than X-ray D. same wavelength as that of X-ray.

179. The transducer used in television transmission works on the principle of A. electromagnetic induction B. photoelectric effect C. Raman’s effect D. Rayleigh’s effect.

180. The source that gives line emission spectrum when subjected to dispersion is A. Molten iron B. Sun C. Mercury vapour D. Candle flame.

181. The application of Doppler effect of microwave among the following is A. Ultrasound scanner B. Echocardiography C. Tracking of artificial satellites D. Determining velocity of submarine.

182. Which of the following is not a good practice to conserve fuel ?

A. Using public transport system B. Using motor bike to travel short distances C. Using bicycle to travel short distances D. Walking the short distances.

183. The ratio of number of moles of butane to the number of moles of oxygen necessary for complete combustion of butane is A. 1 : 2 B. 2 : 3 C. 1 : 5 D. 2 : 13.

184. Human beings are interfering in bio-geochemical cycle by using A. soaps B. detergents C. paper D. cotton.

185. The blue pigment present in red algae along with phycoerythrin is A. Chlorophyll-c B. Phycocyanin C. Chlorophyll-b D. Xanthophyll.

186. If reverse transcriptase enzyme is absent in HIV then it A. cannot survive B. can synthesise DNA C. cannot synthesise DNA D. cannot adapt itself to the host.

187. Concentrated hydrochloric acid is added to a sample taken in a test-tube. After some time, it turns to crimson reD. The sample is adulterated A. cooking oil B. ghee C. turmeric powder D. honey.

188. The microbe present in paddy fields which has the capacity to absorb and store atmospheric nitrogen is A. Rhizobium B. Nitrobacter C. Anabaena D. Pseudomonas.

189. The technique of breaking DNA into fragments using specific enzymes and gel electrophoresis is A. recombinant DNA technology B. DNA fingerprint technology C. tissue culture D. cloning.

190. Water is to be sterilized for drinking, without using any chemicals, this can be done by using, A. UV rays B. visible light C. Radio waves D. ultrasonic waves 191. An engineer wants to design an engine to convert 800 kJ of heat into 840kJ of useful mechanical work. The correct statement related to the above engine is that A. It is less efficient B. It is more efficient C. It cannot be designed D. It is 100% efficient.

192. In a nuclear reactor, the numbers of cadmium rods used are less than the required number, then one of the possibilities is A. the reactor may explode B. the chain reaction stops C. number of fissions will decrease D. the number of neutrons decrease 193. In soap industry, the chemist forgets to add sodium chloride, during soap manufacturing, the possible effect is A. soap cannot be easily separated B. chemical composition of soap changes C. soap will not get required colour D. the solubility of soap decreases 194. Using sodium hydroxide, as one of the raw materials it is possible to prepare A. soaps & detergents B. cement & ceramics C. glass & plastics D. cement & glass

DNM

195. Unstability of a nucleus is because of A. high proton-neutron ratio B. high proton-electron ratio C. high electron-neutron ratio D. low proton-electron ratio 196. Silicon is an insulator at absolute zero, because A. the covalent bond is broken B. the electron becomes delocalised C. all the electrons are bound to nucleus D. it is an intrinsic semiconductor 197. Borosilicate glass is used in making laboratory equipments because, A. it has high refractive index B. it is highly transparent C. it can withstand temperature fluctuations D. it fuses easily at low temperature 198. In a centrifuge, the particles of larger density, A. move away from the axis B. move towards the axis C. gets mixed with lighter particles D. remain suspended 199. If the distance of the sun from the earth would have been twice the existing value then, the time taken by light to reach earth would be about A. 4 minutes B. 8 minutes C. 16 minutes D. 80 seconds 200. When composite light is passed through a prism the colour in the spectrum with least deviation is A. red B. violet C. blue D. green 201. The metallic salt that comes n the way of forming lather with soap water is A. magnesium chloride B. sodium chloride C. sodium carbonate D. aluminium chloride.

202. Chloroprene is used in A. medical articles B. films C. gaskets D. coating vessels 203. In intrinsic semi-conductors A. number of holes are more than charges B. both holes and charges are equal C. number of holes are less than charges D. only charges are present 204. The functional group in toluene is A. OH B. CHO C. NH2 D. CH3 205. The device used to obtain a pure spectrum of composite light is A. Telescope B. Collimeter C. Prism D. Spectroscope 206. The star of highest apparent brightness among the following is A. Magnitude -1 B. Magnitude 100 C. Magnitude 1 D. Magnitude 0 207. The main energy source for artificial satellites is A. solar heaters B. solar furnace C. solar cells D. solar plant 208. An example for denitrifying bacteria is A. rhizobium B. nitrosomonas C. nitrobacter D. pseudomonas 209. A large part of the body weight in man is due to A. bone tissue B. cartilage tissue C. nervous tissue D. blood tissue 210. The animal tissue responsible to store fat as reserve food is A. Areolar tissue B. Adipose tissue C. Reticular tissue D. Cartilage tissue 211. One of the hormones secreted by adrenal cortex is A. adrenalin B. insulin C. cortisone D. thyroxin 212. Which of the following is not a quality guarantee mark for food products?

A. FPO B. AGMARK C. FPA D. ISI 213. The part of the brain that regulates body temperature, water balance, appetite and sleep is A. cerebrum B. cerebellum C. thalamus D. hypothalamus 214 Ravi is a regular dialysis patient, he may get infected with A. brain fever B. tuberculosis C. AIDS D. Hepatitis-B 215 The algae having chlorophyll a and c along with xanthophylls belongs to A. red algae B. green algae C. brown algae D. yellow algae

DNM

216 Fleming’s right hand rule is also called A. Screw Rule B. Motor Rule C. Thumb rule D. Dynamo rule 217 A photon is a A. Quantum of light energy B. Neutral particle C. Positively charged particle D. Negatively charged particle 218 If a semi-conductor is p-type, then which of the following impurity can be added to it A. Germanium B. Phosphorus C. Boron D. Silicon 219 A merry-go-round has a radius 3m and completes a revolution in 3 seconds, its acceleration is A. 4π2 B. 2 π/3 C. 4 π2/3 D. 4 π/3 220. The planets move in elliptical orbits around the sun, with sun at one focus. This is A. Ist Law of Newton B. Hubble’s Law C. Kepler’s Law D. IIIrd Law of Newton 221. The minimum velocity which is required for a body to escape the gravitational attraction of the earth is about A. 11.2 m/s B. 11.2 km/s C. 11.2 m/h D. 9.8 m/s 222. Which of the following has a carburettor?

A. Steam engine B. diesel engine C. diesel & petrol engine D. petrol engine 223. The colour of the ray which comes out when a red ray of light is passed through a prism is A. green B. white C. red D. yellow 224. Which of these animals can hear ultrasound?

A. birds B. man C. bat D. ant 225. The largest unit used to measure the stellar distance is A. Kilometer B. parsec C. astronomical unit D. light year 226 A positron is represented as A. -1n0 B. +1n0 C. +1e0 D. -1e0 227. Heavy water is A. deuterium oxide B. tritium C. deuterium D. hydrogen peroxide 228 We receive solar radiation in the form of A. light B. sound C. heat D. heat and light 229. When fluorescent lamp is used in the place of a bulb ___ of energy is saved A. 40% B. 20% C. 60% D. 70% 230. Chemical formula of Haematite is A. Fe3O4 B. Fe2O3 C. Fe3O4 D. Fe3O2 231.The common name of sodium silicate is A. dry glass B. waterglass C. permutite D. carborandum 232. CNG stands for A. Compressed Number Gas B. Compressed Natural Gas C. Contracted Natural Gas D. Compressed Neon Gas 233.The gasket of a pressure cooker is made up of A. Teflon B. Chloroprene C. Polythene D. Thiokol 234. A sample of hard water on boiling produces carbon dioxide. The salt present in the hard water is A. Bicarbonate B. chloride C. sulphate D. carbonate 235. The molecular formula of Stearic Acid is A. C17H35COOH B. C17H33COOH C. C17H31COOH D. C17H29COOH 236. A limbless amphibian is A. frog B. toad C. salamander D. Ichthyophis 237. The longest bone in the human body is A. hand bone B. thigh bone C. ear bone D. nose bone 238. A gland embedded in another gland is A. parathyroid B. Pituitary C. gonad D. adrenal 239. Which one of the following is not a quality guarantee mark for good products?

A. FPO B. AGMARK C. FPA D. ISI 240. The gas responsible for green house effect is A. Carbon monoxide B. Ozone C. Chlorofluoro Carbon D. Carbon Dioxide

DNM

241. Centrifugal force is due to A. Speed of rotational motion B. Inertia of rotational motion C. Velocity of rotational motion D. all of the above 242. The weight of an object is slightly higher near the poles, than at the equator, due to earth’s A. Magnetic field B. Geoid shape C. Spherical shape D. Atmosphere 243. If a sample of a radio active element contains N nuclei at a time, then after 3 half-lives, the number of nuclei in the sample reduces by A. N/8 B. N/2 C. N/3 D. N/4 244. The nucleus formed by the fusion of two deuterium nuclei is A. Helium B. Neon C. Hydrogen D. Tritium 245. Solar cells are of A. High efficiency, low cost B. High efficiency, High Cost C. Low efficiency, low cost D. Low efficiency, High cost 246. Goldsmith mixes a small quantity of copper to pure gold to make it A. Attractive B. Brittle C. Soft D. Hard 247. The red alga among the following is A. Spirogyra B. Ectocarpus C. Sargassum D. Polysiphonia 248. In nerve cells, axon is covered by a fatty sheath called A. cuticle layer B. Dendrite C. Myelin sheath D. Epidermis 249. The first group of terrestrial plants to develop vascular tissues is A. Pteridophyta B. Angiosperms C. Bryophyta D. Gymnosperms 250. The tissue endothelium found in the blood vessels is referred as A. Cuboidal epithelium B. Squamous epithelium C. Ciliated epithelium D. Stratified epithelium 251. The part of the brain which regulates the body temperature is A. Mid-brain B. Thalamus C. Hypothalamus D. Cerebellum 252. Heavy water is A. Deuterium B. Tritium C. Deuterium Oxide D. Hydrogen peroxide 253. The nearest galaxy to the Earth is A. Milkyway B. Andromeda C. Alphacentauri D. Saptharshi 254. Efficiency of an engine which performs work of 420 Joules by utilizing 700 Joules of heat energy is A. 80% B. 60% C. 40% D. 20% 255. The mass of an object is 10kg. Its average weight on the surface of earth in kg m/s2 is A. 10 B. 98 C. 9.8 D. 980 256. When the distance between the two objects is doubleD. The force between the two objects before and after doubling are in the ratio.

257. Number of Photo electrons ejected by a radiation in photoelectric effect is directly proportional to its A. Intensity B. frequency C. Wavelength D. Velocity 258. Which of these relations best describe the gravitational force exerted on a man of mass m, standing on the earth of radius rE and mass mE.

DNM

A. F =

GmmE rE 2

B.

F=

mmE rE 2

C.

g=

GmmE

rE

2

d . g = GmmE

rE

259. The expanded form of the geostationary satellite ‘APPLE’, launched in 1981 is A. Asian Passanger Payload experiment B. Aeronautic passenger Payload experiment C. Ariane passenger payload experiment D. Alien passenger payload experiment 260. Which os these rays doesn’t reach the earth’s surface, even if emitted by the sun A. Radio waves B. Low frequency UV rays C. Infrared rays D. High frequency UV rays 261. Quantity of elements found in Sun and other stars can be measured by A. number of lines B. intensity of lines C. colour of lines D. nature of lines 262. Who among the following scientists is not related to Indian Space Technology?

A. Madhavan Nayar B. S.Radhakrishnan C. Prof.U.R.Rao D. Dr.K.Radhakrishnan

263. In the extraction of Iron: limestone, concentrated haematite ore and coke are mixed in the ratio, A. 8 : 1 : 4 B. 4 :1 : 8 C. 1 : 8 : 4 D. 8 : 4 : 1 264. If 1 mg of mass is converted into energy, then the liberated energy is equal to A. 9x1011J B. 9x1010J C. 6x1010J D. 8.5x1010J 265. The correct chemical equation representing the production of glass is B. Na2CO3 + SiO2 --------- Na2SiO3 + 2CO2 A. Na2CO3 + SiO2 ---------- Na2SiO3 + CO2 C. Na2CO3 + 2SiO2 --------- Na2SiO3 + CO2 D. Na2CO3 + SiO2 --------- 2Na2SiO3 + CO2 266. The technique of alcoholic fermentation without using yeast was introduced by A. Louis Pasteur B. Edward Bubner C. James Cook D. Lewen Hook 267. Natural gas is a mixture of A. 80% Methane, 13% Ethane, and 7% other Hydrocarbons B. 80% Ethane, 13% Methane, and 7% other Hydrocarbons C. 80% Butane, 13% Ethane, and 7% other Hydrocarbons D. 80% Ethane, 13% Butane, and 7% other Hydrocarbons 268. In order to manufacture ceramics, temperature has to be maintained at A. 1973K B. 19730C C. 1873K D. 18730C 269. The energy released by fission of 1g of U-235 is ©. 8.5 x 1010kJ ¹. 8.5 x 1010J r. 7.5 x 1010J J. 9.5 x 1010J 270. In the circuit symbol of n-p-n transistor, the arrow mark is upright from base to emitter, because, A. electrons flow from p-base to n-emitter B. emitter-base junction is forward biased C. conventional current direction is opposite to the electron flow D. all the above 271. The matrix of connective tissue does not contain A. Collagen B. elastin C. Calcium Phosphate D. Plasma 272. Number of cranial nerves in birds is A. 30 pairs B. 31 pairs C. 10 pairs D. 12 pairs 273. The tissue endothelium found in blood vessels is referred to as A. cuboidal epithelium B. squamous epithelium C. ciliated epithelium D. stratified epithelium 274. In human beings, the ratio between the weight of the spinal cord and the weight of the brain is A. 8 : 1 B. 4 : 1 C. 55 : 1 D. 1 : 55 275. Dynamo is a device which converts A. Mechanical energy into electrical energy B. electrical energy into mechanical energy C. alternate current into direct current D. direct current into alternate current 276. The best method of getting maximum e.m.f during electro magnet induction is by: A increasing the number of turns of the coil B. increasing intensity of magnetic field C. increasing the rate of change of magnetic field linking with the coil D. changing the direction of the magnetic field 277. Card board cylinder is selected in the Faraday’s experiment because Card Board is A. Soft and easily available B. bad conductor of electricity C. less expensive D. good conductor of electricity 278. The principle of working of DC motor is A. Electromagnetic induction B. Fleming’s left hand rule C. magnetic effect of electric current D. Fleming’s right hand rule 279. The amount of deflection of the pointer of the galvanometer in Faraday’s experiment depends on A. number of turns in the coil B. rate of change of magnetic field C. strength of the magnet D. direction of the motion of magnet 280. In Faraday’s experiment, the current is not produced when A. the coil is moved and the magnet is still B. magnet is moved and the coil is stationary C. both the coil and magnet are moved D. both the coil and magnet are stationary

DNM

281. A student is provided with bar magnets, insulated copper wire, card board cylinder and a galvanometer. He can demonstrate A. Faraday’s experiment B. Fleming’s left hand rule C. Principle of motor D. Principle of dynamo 282. Which of the following is not a transverse wave ?

A. Radio B. Sound C. Micro D. Light 283. The electromagnetic radiation used as an efficient sterilizer is : A. Infra red B. ultra violet C. gamma rays D. micro wave 284. If a radiation has velocity lesser than that of light, then the radiation symbolically. is: A. B. C. x D. uv 285. The depletion in the Ozone layer is harmful because it acts as a shielf against A. X rays B. Infrared rays C. ultra violet rays D.X-rays 286. Automatic traffic signal has to be installed near the school. This can be done by applying the principle of: A. laser B. holography C. radiography D.photoelectric effect 287. The property of laser used in laser cutting and welding A. coherence B. monochromaticity C. high energy density high intensity. D.directionality 288. A person wants to separate real gems & artificial gems from a heap. The radiation tobe used, is A. u.v. radiation B. Infrared radiation C. X-radiation D. laser light 289. Electrical conductivity of a semiconductor increases by A. increasing temperature B. decreasing temperature C. increasing length of the material D. decreasing length of the material 290. If a semiconductor is n-type extrinsic semiconductor, then the following impurity present in it is: A. silicon B. Boron C. Aluminum D. Phosphorus 291. Which of the following is used to make the current flow in one direction or for rectifying action?

A. transistor B. diode C. transmitter D. modulator 292. A merry-go-round has a radius of 3m and completes a revolution in 3 seconds. It’s acceleration is A. 4x2 B. 2x2/ 3 C. 4x2 / 3 D. 4x/3 293. Wet clothes are dried in washing machine due to : A. rapid rotation of the motor B. centrifugal force acting on the cylinder C. centripetal force of the rotating cylinders D. hot air from the fan 4 K B E 294. Centrifugal force is experienced while, A. Running in a straight track B. moving in a lift C. Bungee Jumping from a height D. Driving a car round the circle 295. A motor bike rider bends as he moves round a curve, this is to: A. gain balance B. avoid falling C. get necessary centripetal acceleration D. gain speed 296. The formulae for centripetal force and gravitation force are A. ½ mv2, GMm /r2 B. mv2 /r, GMm / r2 C. Mv2/ r, GMr2/ m D. mv2/r, GMm/r 297. A rock is brought from the surface of moon, then its A. mass will change B. weight will change C. weight will change but not mass D. weight and mass remain same 298. An iron ball and a cricket ball having same radius are dropped from a height ‘h’ at the same time To reach the grounD. The time taken by, A. iron ball is more than the cricket ball B. cricket ball is more than the iron ball C. both will be the same D. each of them will be different 299. Which of the following is related to earth’s gravitational force ?

A. A piece of iron moving towards magnet B. An object sliding down on an inclined plane C. Blades of wind mill rotating in the presence of wind D. A magnetic needle deflecting near a current carrying conductor.

DNM

300. A geostationary satellite has same: A. mass as that of the earth B. radius as that of the earth C. period of revolution as that of earth D. period of rotation as that of earth 301. The escape velocity of a rocket depends upon the weight of: A. the rocket B. the satellite it launches C. both rocket and satellite D. neither rocket nor satellite 302. Rockets can fly in vacuum due to the presence of : A. propellants B. payload C. oxidant D. exhaust gas 303. Ice at 00 c is more effective in cooling than water at 00c because A. Ice melts at o0c B. Ice take up heat to melt C. Water boils at 1000c D. Water freezes at 00c 304. These are not required in a diesel engine A. spark plug and carburettor B. carburettor and crank shaft C. spark plug and crank shaft D. spark plug and injunction pump 305. An engine ”P” converts 1800 KJ of heat into 630KJ of work. Another engine “Q” has an efficiency of 40%. The engine that shows more efficiency is : A. P B. Both P and Q C. Q D. neither P nor Q 306. A fault in the carburettor affects the following stroke : A. Intake B. Compression C. Power D. Exhaust 307. Rainbow is formed due to the dispersion of light by: A. Oxygen molecule B. dust particles C. Nitrogen molecule D. water molecule 8 K D A 308. A monochromatic light beam on passing through a prism is : A. deviated B. reflected C. dispersed D. polarized 309. C.V.Raman found that, when a beam of monochromatic light was passed through benzene, the scattered light was A. monochromatic B. non-monochromatic C. of lower-frequency D. of both lower and higher frequency 310. Dispersion in a glass prism takes place, because: A. prism is transparent B. double refraction takes place C. refractive index varies with colours D. white light is made up several colours 311. A device which uses ultra sonic waves to measure the distance, direction and speed of Underwater objects is A. ultrasound scanner B. Sonar C. transmitter D. detector 312. Velocity of sound on the surface of moon will be A. 340 m/s B. 340x6 m/s C. 340/6 ms D. O 313. The relationship between mass and luminosity is used to determine the mass of A. binary stars like Sirius B. Single stars like Sun C. neither binary nor single stars D. both binary and single stars 314. Key assumption of the Big Bang Theory is that the universe is A. expanding B. closed C. open D. collapsing 315. If you are a doctor and want to perform surgery, which of the following instrument would you select to ease your work ?

A. radar gun B. sonar C. ultrasound scanner D. spectroscope 316. Doppler effect in sound is observed as a change in it’s: A. pitch B. Velocity C. frequency D. amplitude 317. Weight of an object on a planet will be : A. different at different places B. same at different places C. different at the same place D. changing with time 318. An atom is made up of these fundamental particles A. Proton, neutron, nucleon B. Proton, electron, nuclide

DNM

C. proton, neutron, electron D. positron, electron, neutron 319. Solar cells work on the principle of : A. Photo electricity B. conductivity of semi conductors C. doping of semiconductors D. stimulated emission 320. Approximate mass number of a neutron in A.m.u is :A. 10 B. 1.8 C. 1.0 D. 1.008 321. Among the isotopes carbon –11,12, 13 &14 the reason for choosing C-14 for ‘Carbon dating’ is: A. C-14 is the heaviest B. It is the most abundantly available C. It is stable D. It under goes spontaneous nuclear changes 322. Pick out an example for fusion reaction from the following : A. 13Al 27 +2He4-------- 15p30+on1 B. 92P235+ on1-------- 54Xe139 + 38Sr95 + energy C. 1H 1 +1H3--------- 2He4+on1 + energy D. 94Pu238 ----------------- 92P234+2He4 323. In nuclear fission 1 micro gram of u235 disappears. The velocity of light is 3x1010cm/seC. The energy in this process is A. 9x1010 ergs B. 9x1014 ergs C. 9x1020ergs D. Zero as matter is indestructible 324. The inside of a solar cooker is painted black so that the solar radiation gets : A. reflected B. absorbed C. transmitted D. trapped 325. Energy crisis is mainly due to : A. Shortage of renewable sources of energy B. the increase in the public transport system C. the increase in scientific advancement and better quality of life D. the ever increasing demand for energy.

326. Which one of the following you can do to save energy, without affecting the quality of your life : A. Going to the school by bus B. stop using warm water for taking bath C. stop studying after sun set D. replacing incandescent lamps by fluorescent lamps 327. The biggest source of metal on the earth is A. Earth’s interior B. oceans C. earth’s crust D. fresh water lakes 328. Sea contains metals in the form of A. soluble salts B. insoluble salts C. precipitate salts D. floating salts 329. Bells are made of metal because of the following property A. Malleability B. Ductility C. Conductivity D. Sonority 330. Four different metals are taken in four different test tubes and concentrated sulphuric acid is Poured in to each of them. In one of the test tubes the solution turns blue then the metal is A. Zn B. Ni C. Co D. Cu 331. The atomic number of copper is 29, its electronic configuration is A. 1s2, 2s2, sp6, 3s2, 3d10, 3p7 B. 1s2, 2s2, 2p6, 3s2, 3p6, 3d10, 4s1 C. 1s2, 2s2, 2p6, 3s2, 3d10, 3p5, 4s2 D. 1s2, 2s2, 2p6, 3s2, 4s2, 3d9, 3p6 15 K B A 332. In the extraction of silicon from quarts Magnesium powder is used as A. oxidizing agent B. reducing agent C. neither oxidizing nor reducing agent D. hydrolysing agent 333. Which property of Invar steel is used in making pendulum ?

A. Tensile strength B. high melting point C. low melting point D. very low co-efficient oflinear expansion 334. The chemical name of quartz is A. silicon carbide B. silicon dioxide C. Silicon chloride D. Silicon carbonate 335. At absolute temperature the four valence electrons of silicon are bound by : A. electrovalent bond B. covalent bond C. metallic bond D. non-metallic bond 336. Silicon can be made to become intrinsic semi conductor by A. applying pressure B. applying heat C. passing electricity D . keeping it in magnetic field 337. Aliphatic hydrocarbons of general formula Cn H2n are called : A. Alkenes B. Alkanes C. Carbocyclic hydrocarbons D . Aromatic hydrocarbons

DNM

338. A sample of hard water forms yellow stains on clothes when used for washing.

The salts causing yellow stains are salts of A. Iron B. Calcium C. Magnesium D. Sodium 339. Water is to be sterilized for drinking purpose, without using any chemicals, this can be done by using, A. UV rays B. visible light C. Radio waves D. ultrasonic waves 340. An engineer wants to design an engine to convert 800 kJ of heat into 840kJ of useful mechanical work. The correct statement related to the above engine is that A. It is less efficient B. It is more efficient C. It cannot be designed D. It is 100% efficient.

341. In a nuclear reactor, the numbers of cadmium rods used are less than the required number, then one of the possibilities is A. the reactor may explode B. the chain reaction stops C. number of fissions will decrease D. the number of neutrons decrease 342. In soap industry, the chemist forgets to add sodium chloride, during soap manufacturing, the possible effect is A. soap cannot be easily separated B. chemical composition of soap changes C. soap will not get required colour D. the solubility of soap decreases 343. Using sodium hydroxide, as one of the raw materials it is possible to prepare A. soaps & detergents B. cement & ceramics C. glass & plastics D. cement & glass 344. Unstability of a nucleus is because of A. high proton-neutron ratio B. high proton-electron ratio C. high electron-neutron ratio D. low proton-electron ratio 345. Silicon is an insulator at absolute zero, because A. the covalent bond is broken B. the electron becomes delocalised C. all the electrons are bound to nucleus D. it is an intrinsic semiconductor 346. Borosilicate glass is used in making laboratory equipments because, A. it has high refractive index B. it is highly transparent C. it can withstand temperature fluctuations D. it fuses easily at low temperature 347. In a centrifuge, the particles of larger density, A. move away from the axis B. move towards the axis C. gets mixed with lighter particles D. remain suspended 348. If the distance of the sun from the earth would have been twice the existing value then, the time taken by light to reach earth would be about A. 4 minutes B. 8 minutes C. 16 minutes D. 80 seconds 349. When composite light is passed through a prism the colour in the spectrum with least deviation is A. red B. violet C. blue D. green 350. The metallic salt that comes in the way of forming lather with soap water is A. magnesium chloride B. sodium chloride C. sodium carbonate D. aluminium chloride.

351. Chloroprene is used in A. medical articles B. films C. gaskets D. coating vessels 352. In intrinsic semi-conductors A. number of holes are more than charges B. both holes and charges are equal C. number of holes are less than charges D. only charges are present 353. The functional group in toluene is A. OH B. CHO C. NH2 D. CH3 354. The device used to obtain a pure spectrum of composite light is A. Telescope B. Collimeter C. Prism D. Spectroscope 355. The star of highest apparent brightness among the following is A. Magnitude -1 B. Magnitude 100 C. Magnitude 1 D. Magnitude 0 356. The main energy source for artificial satellites is A. solar heaters B. solar furnace C. solar cells D. solar plant

DNM

357. An example for denitrifying bacteria is A. rhizobium B. nitrosomonas C. nitrobacter D. pseudomonas 358. A large part of the body weight in man is due to A. bone tissue B. cartilage tissue C. nervous tissue D. blood tissue 359. The animal tissue responsible to store fat as reserve food is A. Areolar tissue B. Adipose tissue C. Reticular tissue D. Cartilage tissue 360. One of the hormones secreted by adrenal cortex is A. adrenalin B. insulin C. cortisone D. thyroxin 361. The part of the brain that regulates body temperature, water balance, appetite and sleep is A. cerebrum B. cerebellum C. thalamus D. hypothalamus 362. Ravi is a regular dialysis patient, he may get infected with A. brain fever B. tuberculosis C. AIDS D. Hepatitis-B 363. The algae having chlorophyll a and c along with xanthophylls belongs to A. red algae B. green algae C. brown algae D. yellow algae 364. Fleming’s right hand rule is also called A. Screw Rule B. Motor Rule C. Thumb rule D. Dynamo rule 365. A photon is a A. Quantum of light energy B. Neutral particle C. Positively charged particle D. Negatively charged particle 366. If a semi-conductor is p-type, then which of the following impurity can be added to it A. Germanium B. Phosphorus C. Boron D. Silicon 367. A merry-go-round has a radius 3m and completes a revolution in 3 seconds, its acceleration is A. 4π2 B. 2 π/3 C. 4 π2/3 D. 4 π/3 368. The planets move in elliptical orbits around the sun, with sun at one focus. This is A. Ist Law of Newton B. Hubble’s Law C. Kepler’s Law D. IIIrd Law of Newton 369. The minimum velocity which is required for a body to escape the gravitational attraction of the earth is about A. 11.2 m/s B. 11.2 km/s C. 11.2 m/h D. 9.8 m/s 370. Which of the following has a carburettor?

A. Steam engine B. diesel engine C. diesel & petrol engine D. petrol engine 371. In human beings, the ratio between the weight of the spinal cord and the weight of the brain is A. 8 : 1 B. 4 : 1 C. 55 : 1 D. 1 : 55 372. Which of the following is not a quality guarantee mark for food products?

A. FPO B. AGMARK C. FPA D. ISI 373. The colour of the ray which comes out when a red ray of light is passed through a prism is A. green B. white C. red D. yellow 374. Which of these animals can hear ultrasound?

A. birds B. man C. bat D. ant 375. The largest unit used to measure the stellar distance is A. Kilometer B. parsec C. astronomical unit D. light year 376. A positron is represented as A. -1n0 B. +1n0 C. +1e0 D. -1e0 377. Heavy water is A. deuterium oxide B. tritium C. deuterium D. hydrogen peroxide 378. We receive solar radiation in the form of A. light B. sound C. heat D. heat and light 379. When fluorescent lamp is used in the place of a bulb ___ of energy is saved A. 40% B. 20% C. 60% D. 70% 380. Chemical formula of Haematite is A. Fe3O4 B. Fe2O3 C. Fe3O4 D. Fe3O2 381. The common name of sodium silicate is A. dry glass B. waterglass C. permutite D. carborandum

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382. CNG stands for A. Compressed Number Gas B. Compressed Natural Gas C. Contracted Natural Gas D. Compressed Neon Gas 383.The gasket of a pressure cooker is made up of A. Teflon B. Chloroprene C. Polythene D. Thiokol 384. A sample of hard water on boiling produces carbon dioxide. The salt present in the hard water is A. Bicarbonate B. chloride C. sulphate D. carbonate 385. The molecular formula of Stearic Acid is A. C17H35COOH B. C17H33COOH C. C17H31COOH D. C17H29COOH 386. A limbless amphibian is A. frog B. toad C. salamander D. Ichthyophis 387. The longest bone in the human body is A. hand bone B. thigh bone C. ear bone D. nose bone 388. A gland embedded in another gland is A. parathyroid B. Pituitary C. gonad D. adrenal 389. Which one of the following is not a quality guarantee mark for good products?

A. FPO B. AGMARK C. FPA D. ISI 390. The dopant used in p-type semiconductors is A. Aluminium B. Phosphorus C. Arsenic D. Antimony 391. In AC dynamo, the free ends of the copper wire are connected to two full copper rings called A. Armature B. Split-rings C. Slip-rings D. Brushes 392. The depletion of ozone layer is harmful to us, because, the ozone layer acts as a shield against A. Ultraviolet Rays B. Infrared rays C. Gamma rays D. X-rays 393. In a diode, the p-side represents a/an A. Base B. Anode C. Cathode D. Junction 394. The device used to separate the viruses in a liquid media is A. Spectroscope B. Ultrasound scanner C. SONAR D. Centrifuge 395. The receptor cells which are sensitive to bright light are a) rods b) cones c) fovea d) blind spot 396. Molecular formula of ethane is a) C2H2 b) C2H4 c) C2H6 d) CH4 397. General formula for alkanes is a) CnH2n+2 b) CnH2n-2 c) CnH2n d) CnHn 398. In an experiment of photoelectric effect the number of photoelectrons has to be increased without changing their frequency. The suitable step to be taken about theincident radiation for this is (A) increasing intensity without changing frequency (B) increase both frequency and intensity (C) increase frequency without increasing intensity (D) increasing only frequency.

399. To distinguish between real gems and artificial gems a merchant may use which of the following radiations ?

(A) Infrared rays (B) –rays (C) X-rays (D) Ultraviolet rays.

400. The function of carburettor is to allow (A) only petrol into the engine (B) only air into the engine (C) mixture of petrol and air into the engine (D) diesel and air into the engine.

401. Which of the following engines is more efficient ?

Heat utilised Work done (A) 80 kilojoules 32 kilojoules (B) 60 kilojoules 12 kilojoules (C) 50 kilojoules 25 kilojoules (D) 90 kilojoules 27 kilojoules.

402. In echo cardiography ( ECG ) the frequency of the sound waves used is (A) 20 hertz to 20 kilohertz (B) 20 hertz to 2 kilohertz (C) beyond 20 kilohertz (D) below 20 hertz.

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403. In Kaiga Atomic Power reactor plant, the fuel that can be used is (A) Coal (B) Uranium (C) Petrol (D) Natural gas.

404. C10 H 22 Temperature C5 H 12 + x If this equation is considered as an experiment of cracking, the compound in the place of x is (A) C 5 H 10 (B) C 5 H 12 (C) C 5 H 8 (D) C 5 H 5 405. Polymer used to make gasket of pressure cooker is (A) Polythene (B) Nylon (C) Teflon (D) Thiokol.

406. The common raw material used in the preparation of soap and detergent is (A) sulphuric acid (B) sodium hydroxide (C) stearic acid (D) long chain hydrocarbons.

407. Detergents are more efficient than soaps in cleaning, yet you have to limit the use of detergents Because (A) they are costly (B) they are not eco-friendly (C) their production cost is high (D) they produce scum in hard water.

408. Hepatitis-B does not spread through (A) contaminated food (B) mosquito bite (C) sexual contact with infected person (D) sharing unsterilized needles.

409. Dropsy : Argemone oil :: Minamata : …………………

(A) Methyl cyanide (B) Methyl bromide (C) Methyl chloride (D) Methyl mercury.

410. Saplings developed during tissue culture are exclusively the products of (A) Mitosis (B) Meiosis (C) Karyokinesis (D) Cytokinesis.

411. Cotton clothes are basically cells of (A) Cambium (B) Collenchyma (C) Sclerenchyma (D) Scleride.

412. While purchasing a sealed packet of ghee, one should look for which mark ?

(A) ISI (B) AGMARK (C) FPO (D) ISO. 413. A phenomenon in which magnetic field produces electric current in a conductor is (A) Magnetic effect (B) Chemical effect (C) Electromagnetic induction (D) Photoelectric effect.

412. A device converting mechanical energy into electrical energy is (A) Dry cell (B) Motor (C) Dynamo (D) Solar cell.

413. Which one of the following can do photoelectric effect from most of the elements ?

(A) Gamma radiation (B) Common light (C) Ultraviolet rays (D) X-rays.

414. The electromagnetic waves that stimulate blood circulation are (A) Radio waves (B) Infrared rays (C) Gamma rays (D) X-rays.

415. The element used extensively in electronic instruments is (A) Phosphorus (B) Boron (C) Aluminium (D) Silicon.

416. Which of the following are the sides of diode ?

(A) Anode-Emitter (B) Emitter-Collector (C) Anode-Cathode (D) Cathode-Emitter.

417. Which one of the following is the circuit symbol of p-n-p transistor ?

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418. Which one of the following is responsible for separation of particles of different densities in a centrifuge ?

(A) Centrifugal force (B) Centrifugal reaction (C) Centripetal force (D) Centripetal reaction.

419. If a string whirling with a stone snaps, then the motion of stone will be (A) in same circular motion (B) towards centre (C) in the direction of tangent (D) in the extending ( expanding ) circular path.

420. The force of attraction between any two objects is not related to the (A) physical nature of objects (B) mass of the objects (C) distance between the objects (D) force acting along the line joining two objects.

421. Weightlessness is experienced in which of the following situations ?

(A) Travelling in aircraft (B) Moving in upward direction in a lift (C) Moving up in a giant wheel (D) In a spacecraft orbiting around the earth.

422. "An imaginary line drawn from the sun to planet sweeps equal areas in equal intervals of time."

This law is (A) First law of planetary motion (B) Second law of planetary motion (C) Third law of planetary motion (D) Universal law of gravitation.

423. Colours in a pure spectrum are (A) mixed (B) found to be overlapping (C) away from one another (D) occupying their respective places distinctly.

424. The part of the spectroscope that magnifies the image of the spectrum is (A) Slit (B) Telescope (C) Lenses (D) Prism.

425. Which of the following is continuous emission spectrum ?

(A) Spectrum of light that is emitted by gases (B) Spectrum obtained by passing sunlight through semi-transparent medium ( object ) (C) Spectrum obtained from the flame of burning candle (D) Spectrum obtained by passing light of carbon arc lamp through sodium vapour.

426. Sound propagates with maximum velocity ( speed ) through which of the following mediums ?

(A) Solid (B) Gas (C) Liquid (D) Vacuum.

427. Echo-cardiography by using ultrasound waves is helpful to study of which of the following organs (A) Kidney (B) Urinary bladder (C) Pancreas (D) Heart.

428. The difference in brightness of two stars having the magnitudes + 1 and + 5, is (A) ( 2·5 ) 1 (B) ( 2·5 ) 2 (C) ( 2·5 ) 3 (D) ( 2·5 ) 4 429. Sun may turn into black hole if one of the following is very less : (A) Emission of energy (B) Mass (C) Volume (D) Brightness.

430. Which one of the following stars is binary star ?

(A) Rigel (B) Sun (C) Sirius (D) Betelgeuse.

431. Which one of the following is not correct with respect to radioactive emission ?

(A) Alpha rays are emitted (B) Beta rays are emitted (C) Alpha and Beta rays are emitted simultaneously (D) There may be Gamma rays along with Alpha or Beta rays.

432. The correct equation which indicates nuclear fission of Uranium–235 is (A) 92 U 235——→ 56 Ba 141+ 36 Kr 92+ 30 n 1+ energy (B) 92 U 235 + 0 n 1——→ 56 Ba 41+ 36 Kr 92+ 30 n 1+ energy (C) 92 U 235 + 0 n 1——→ 56 Ba 140+ 36 Kr 92+ 3 0 n 1+ energy (D) 92 U 235 + 0 n 1——→ 56 Ba 141+ 36 Kr 92+ 3 0 n 1+ energy.

433. 1 mg of mass is converted into energy ; then the liberated energy is equal to (A) 9 × 10 11 J (B) 9 × 10 10 J (C) 6 × 10 10 J (D) 8·5 × 10 10 J. 434. Which reaction(s) in the sun account(s) for its huge amount of energy ?

(A) Fusion of heavy nuclei (B) Fission of heavy nuclei (C) Proton-proton chain and Carbon cycle (D) Fusion of Carbon nuclei with Helium nuclei.

435. What is the function of transparent glass plate used in the Solar Cooker ?

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(A) Absorbs the Solar radiation (B) Prevents the Solar radiation to go out of the wooden box (C) Reflects the Solar radiation into the box(D) Does not allow the heat energy to flow out of the box.

436. In relation to the use of hard water, which of the following does not cause energy crisis ?

(A) Not using drinking water for other uses (B) Not switching off the electrical instrument while not in use

(C) Not encouraging the use of other alternating energy sources (D) Not using the improvised heating facilities.

437. If you have to use electrical energy very efficiently, then you need to select (A) Fluorescent tubelight (B) Compact Fluorescent ( tube ) lamp (C) Incandescent lamp (D) Electric arc lamp.

438. Which of the following elements gives its oxide quickly when kept in air ?

(A) Magnesium (B) Iron (C) Sodium (D) Copper.

439. Which of the following is the correct arrangement in the purification of copper by electrolytic refining ?

(A) Both Cathode and Anode are pure Copper plates (B) Only Anode is made up of pure Copper (C) Only Cathode is an impure Copper plate (D) Impure Copper is Anode and pure Copper is Cathode.

440. Copper + Zinc + Nickel — This composition of metals is helpful in producing (A) Surgical instruments (B) Resistance coils (C) Heating coils (D) Cutting tools.

441. The substance that acts as an insulator at 0 K, but conducts electric current as the temperature increases is (A) Carbon (B) Indium (C) Germanium (D) Phosphorus.

442. Compound of Silicon used in glass cutting is (A) Silicon carbide (B) Silicon dioxide (C) Sodium silicate (D) Calcium silicate.

443. Which one of the following is the covalent structure ( structural formula ) of benzene ?

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444. For the production of glass that absorbs radiation, which one of the following is used ?

(A) Aluminium oxide (B) Lead oxide (C) Boron (D) Carbon.

445. Which one of the following is made up of a plastic that does not turn soft or melt on heating ?

(A) Plastic bucket (B) Plastic insulation on electric wires (C) Plastic water pipes (D) Handle of the electric iron.

446. Which of the following is prepared by synthetic material ?

(A) Gravel (B) Wooden chair (C) Window rods (D) Fuse box.

447. Which one of the following is not correct with respect to the use of hard water ?

(A) Clothes are easily washed when used with soap and hard water (B) Pulses are not cooked properly in hard water (C) Hard water used for bathing makes the skin dry and leaves whitish residue on skin (D) Boiler gets corroded when hard water is boiled inside.

448. Which of the following substances are formed in the process of saponification ?

(A) Fat and Oil (B) Soap and Sodium hydroxide (C) Glycerol and Sodium hydroxide (D) Soap and Glycerol.

449. Even though the cleansing property of detergent is better than soap, you have to limit the use of detergents. Why ?

(A) The cost of detergent is more than soap (B) It effects on the hands of the user (C) The production is more complicated (D) It pollutes both water and land.

450. Rhizoids are present in (A) Pteridophyta (B) Bryophyta (C) Gymnosperms (D) Angiosperms.

451. The correct sequence of carbon cycle is (A) Photosynthesis, Nutrition, Respiration and Decomposition (B) Nutrition, Respiration, Decomposition and Photosynthesis (C) Respiration, Decomposition, Photosynthesis and Nutrition (D) Decomposition, Photosynthesis, Nutrition and Respiration.

452. The animal group with dry skin and horny scales is (A) amphibian (B) reptiles (C) birds (D) mammals.

453. The egg laying mammal among the following is (A) Platypus (B) Bat (C) Giraffe (D) Kangaroo.

454. The pigment which gives red colour to polysiphonia is (A) Phycocyanin (B) Chlorophyll (C) Xanthophyll (D) Phycoerythrin.

455. Diaphragm is a muscular membrane that separates which of the following from each other ?

(A) Heart and Lungs (B) Stomach and Urinary bladder (C) Thoracic and Abdominal cavities (D) Stomach and Liver.

456. From the functional point of view the white blood cells may be compared to (A) an army (B) scavengers (C) distributors (D) messengers.

457. The tissue that consists of fat cells which also provides protection to some organs is (A) adipose tissu (B) areolar tissue (C) muscular tissue (D) nervous tissue.

458. Xylem tissue is associated with (A) Conduction of water (B) Transpiration of water (C) Absorption of water (D) Storage of water.

459. The part of the brain which is responsible for the maintenance of the equilibrium of the body is (A) Pons (B) Cerebellum (C) Medulla oblongata (D) Cerebrum.

460. The endocrine gland which is present on the upper surface of the kidney is (A) Thyroid gland (B) Parathyroid gland (C) Pituitary gland (D) Adrenal gland.

461. The abnormality that occurs in newborn babies due to hypothyroidism is (A) myxoedema (B) acromegaly (C) simple goiter (D) cretinism.

462. The incubation period of HIV in children is (A) 10 to 12 months (B) 12 to 14 months (C) 16 to 22 months (D) 18 to 24 months.

463. ELISA test helps to detect (A) HIV (B) Diabetes (C) Hepatitis-B (D) Glaucoma.

464. When the skin, sclera and urine turn yellow in colour, it indicates (A) Liver Cancer (B) Cirrhosis (C) AIDS (D) Jaundice.

465. As an adulterant, argemone oil causes (A) Laziness (B) Body pain (C) Dropsy (D) Giddiness.

466. Metanil yellow is used as an adulterant to brighten the colour of (A) Pulse (B) Jowar (C) Fruit (D) Bakery product.

467. When the lactometer is made to float in unadulterated milk, it shows the reading of (A) 1路016 (B) 1路026 (C) 1路036 (D) 1路046.

468. Drosera traps and digests insects in order to get the compounds of (A) Sulphur (B) Phosphorus (C) Nitrogen (D) Carbon.

469. The pollution that can be controlled by the use of unleaded petrol is (A) water pollution (B) thermal pollution (C) air pollution (D) radioactive pollution.

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470. Oxygen transportation in the blood is affected due to the addition of (A) Carbon monoxide with haemoglobin (B) Oxygen with haemoglobin (C) Nitrogen with haemoglobin (D) Carbon dioxide with white blood cells.

471. The best & easy method out of the following to get maximum emf from a dynamo purchased is by (A) increasing the number of turns (B) increasing the strength of the magnet (C) increasing the speed of rotation of the coil (D) covering the dynamo by an insulator.

472. A magnet is pushed in all the four coils shown below. The coil which produces lowest emf is

473. Electromagnetic radiation having wavelength less than infrared rays and more than ultraviolet rays can be used for (A) sterilization (B) photography (C) communication (D) radiography.

474. Photoelectric effect establishes (A) particle nature of light (B) wave nature of light (C) wave nature of photons (D) colours in the visible light.

475. Which one of the following affects the conductivity of a pure semiconductor ?

(A) Temperature (B) Length (C) Area (D) Thickness.

476. The component in a radio receiver which separates AF signal from the carrier wave is (A) a speaker (B) a detector (C) RF tuner (D) antenna.

477. Which one of the following is not an electronic device ?

(A) Television (B) Radio (C) Incandescent bulb (D) Computer.

478. Formula to calculate centripetal force is

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479. The function of Centrifugal Governor is to (A) protect the engine from short circuit (B) prevent the engine from overheating (C) control the speed of the engine (D) stop the engine.

480. When the distance between the two objects is doubled, the forces between the two objects before and after doubling are in the ratio (A) 1 : 1 (B) 4 : 1 (C) 1 : 2 (D) 2 : 1.

481. Kepler's third law is denoted as (A) r 3 αT 2 (B) r 3 αT 3 (C) r 3 αT (D) r 3 α ∝1 2 T .

482. The mass of an object is 10 kg. Its average weight on the surface of earth in kg m / s 2 is (A) 10 (B) 98 (C) 9·8 (D) 980.

483. A physicist observes the raise of temperature in a thermometer till the water raises to 100°C at

sea level. Even if the heating is continued the thermometer shows only the same temperature.

This is because (A) thermometer cannot show more than 100°C (B) enough mercury is not filled in the thermometer (C) water will not accept the heat to raise the temperature (D) heat is utilised by the water to change into steam.

484. Which is the best engine among the following ?

(A) 720 kJ of work is done by 1800 kJ of heat (B) 450 kJ of work is done by 900 kJ of heat (C) The efficiency is 36% (D) 100 kJ of work is done by 1000 kJ of heat.

485. Clouds appear generally white in the sunlight because (A) clouds produce composite light (B) of Raman's effect (C) clouds are transparent (D) clouds scatter all the wavelengths of light uniformly.

486. When a monochromatic light is passed through organic liquids, the scattered light in comparison with the incident light will be of (A) the same frequency (B) the higher frequency (C) the lower frequency (D) both lower and higher frequencies.

487. The colour which bends the least, when composite light is passed through a glass prism is (A) red (B) violet (C) yellow (D) blue.

488. Which one of the following is true for sound waves ?

(A) No medium is required for propagation (B) Velocity is same in all the media (C) They are longitudinal waves (D) They do not undergo reflection.

489. The ultrasound signal sent by a sonar takes 2 sec to return. If the velocity of sound in water is 1·5 km/s, then the depth of the ocean is (A) 1·5 km (B) 2 km (C) 2·5 km (D) 3 km.

490. Two stars P and Q have magnitudes one and three respectively. The correct statement about this in the following is (A) Q is 2·5 times brighter than P (B) P is 6·25 times brighter than Q (C) P is 2·5 times brighter than Q (D) Q is 6·25 times brighter than P. 491. The type of galaxy to which our galaxy belongs is (A) spiral (B) irregular (C) elliptical (D) andromeda.

492. Which one among the following stars has the highest temperature ?

(A) Sun (B) Rigel (C) Betelgeuse (D) Sirius.

493. The half-life period of radium is 1600 years. The time needed for 2 g. of radium to reduce itself to 25% is (A) 3200 years (B) 2400 years (C) 4800 years (D) 1600 years.

494. An engineer advises the mechanic who makes the solar water heater to bend thecopper pipe in the form of a coil to (A) make water to flow easily (B) give attractive look (C) reduce the cost (D) increase the area of heat absorption.

495. The most important function of the glass lid in a solar cooker is to (A) allow light into the cooker (B) prevent entry of dust (C) act as an insulator (D) help to trap the heat rays.

496. The incandescent bulbs have to be banned, because they (A) need borosilicate glass only (B) are costly (C) have short life (D) consume more energy.

497. The metal which does not react with hydrochloric acid is (A) zinc (B) magnesium (C) platinum (D) iron.

498. The concentration of copper ore is done by (A) hydraulic washing ( water washing ) (B) froth flotation (C) magnetic separation (D) electrolysis.

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499. In preparing amorphous silicon, dilute hydrochloric acid is used to (A) remove unchanged silica (B) dissolve magnesium oxide (C) increase its reactivity (D) give brown colour.

500. The compound of silicon that can be used in calico printing is (A) sodium silicate (B) aluminium silicate (C) silicon carbide (D) calcium silicate.

501. The property of self-linking of carbon atoms in long chain is called (A) allotropy (B) isotope (C) catenation (D) isomerism.

502. Gypsum is added to hot clinkers of cement to (A) slow down rapid setting (B) increase the strength of the cement (C) absorb more water (D) become hard after setting.

503. The aromatic hydrocarbon among the following is

504. The electronic configuration of carbon in its excited state is

505. Which one of the following is a thermoplastic ?

(A) Bakelite (B) Polyvinyl chloride (C) Silicones (D) Epoxy resins.

506. The gasket of a pressure cooker is made of (A) Teflon (B) Chloroprene (C) Polythene (D) Thiokol.

507. In an experiment, a sample of hard water is heated. The gas liberated turns lime water milky.

The sample of water contains (A) bicarbonates (B) chlorides (C) sulphates (D) phosphates.

508. “Though detergent is a pollutant its use is unavoidable.” Which one of the following supports best the above argument ?

(A) It saves valuable edible oils (B) It cleans better than soap (C) It saves time (D) It can be used even if the water is hard.

509. The formula of stearic acid is (A) C 17 H 35 – COOH (B) C 17 H 37 – COONa (C) C 17 H 33 – COOH (D) C 17 H 35 – COONa. 510. Which of the following is a disadvantage of biotechnology ?

(A) Seedless fruits (B) Sterility of seeds (C) Disease resistant plants (D) Reduce the life span of plants.

511. The plants in which seeds are not enclosed in fruits are (A) Angiosperms (B) Gymnosperms (C) Pteridophytes (D) Bryophytes.

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512. The group containing only amphibians is (A) frog, toad, lizard, icthyophis (B) salamander, frog, lizard, toad (C) icthyophis, frog, toad, salamander (D) frog, icthyophis, lizard, salamander.

513. The egg laying mammal is (A) Kangaroo (B) Platypus (C) Whale (D) Bat. 514. In dicot plants, the vascular bundles are arranged (A) in a ring (B) vertically (C) scattered (D) horizontally.

515. Spindle shaped elongated muscle fibres are found in (A) striped muscles (B) unstriped muscles (C) cardiac muscles (D) voluntary muscles.

516. A knot like structure formed by several neurons is (A) nerve (B) axon (C) ganglion (D) dendrite.

517. Olfactory nerve is concerned in sensing (A) smell (B) sound (C) touch (D) light.

518. The air passage which equalizes the air pressure on the two sides of the eardrum is (A) auditory canal (B) nasal cavity (C) wind pipe (D) Eustachian tube.

519. The transmission method which is not applicable for AIDS is (A) sharing unsterilized needles (B) unprotected sex (C) mosquito bite (D) transfusion of infected blood.

520. Bilirubin level increases in the blood when (A) liver cells are severely damaged (B) secretion of insulin is more (C) secretion of glucagon is less (D) HIV intrudes the body.

521. The hormone which is secreted more when one fears by mistaking rope for a snake in the dusk is (A) Thyroxine (B) Adrenaline (C) Androgen (D) Estrogen.

522. The enzyme reverse transcriptase helps in (A) synthesis of RNA in the host cell (B) synthesis of DNA in the host cell (C) destroying the DNA in the host cell (D) destroying the RNA in the host cell.

523. The adulterant vanaspati in ghee is detected by adding (A) concentrated hydrochloric acid and a pinch of salt (B) concentrated nitric acid and a pinch of sugar (C) concentrated hydrochloric acid and a pinch of sugar (D) concentrated nitric acid and a pinch of salt.

524. When one buys processed and canned food, he should see particularly (A) attractive advertisements (B) attractive packing (C) certification by ISI (D) recommendation by neighbourers.

525. Lactometer is used to measure (A) quantity of water in milk (B) density of milk (C) volume of milk (D) density of water.

526. There is a wide opposition for the establishment of oil refineries at Mangalore, mainly because it may cause (A) thermal pollution (B) marine pollution (C) sound pollution (D) soil pollution.

527. During photosynthesis, oxygen enters the body of producers in the form of

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(A) carbon dioxide and water (B) salts and minerals (C) salts and water (D) water and minerals.

528. The two major components of a typical biogeochemical cycle are (A) fixation and recycling (B) reservoir pool and exchange pool (C) biological fixation and artificial fixation (D) ammonification and nitrification.

529. Denitrification means conversion of (A) ammonium salts into nitrates (B) organic compounds into ammonium salts (C) nitrates into free nitrogen (D) nitrogen into nitrates.

520. The technique of effecting desirable changes in the genetic material of an organism is called (A) cloning (B) tissue culture (C) genetic engineering (D) DNA fingerprint.

521. Which of the following is a disadvantage of biotechnology ?

(A) Seedless fruits (B) Sterility of seeds (C) Disease resistant plants (D) Reduce the life span of plants.

522. How many times does the direction of the electric current change when the armature of an A.C. dynamo makes five cycles ?

(A) 5 (B) 10 (C) 15 (D) 20.

523. Number of photoelectrons ejected by a radiation in photoelectric effect is directly proportional to Its (A) intensity (B) frequency (C) wavelength (D) velocity.

524. The electromagnetic radiation used in the treatment of cancer is (A) infrared (B) violet (C) visible light (D) gamma.

525. The reason for rectifying action of a diode is (A) low resistance in n-p direction (B) high resistance in n-p direction (C) very low resistance in n-p direction (D) double the resistance in p-n direction.

526. The dopant used in p-type semiconductors is (A) aluminium (B) phosphorus (C) arsenic (D) antimony.

527. The function of detector in a radio receiver is to (A) mix RF and AF signals (B) amplify RF signals (C) separate RF and AF signals (D) amplify AF signals.

528. The passengers inside an automobile moving fast along a curve feel pushed outwards due to (A) centripetal force (B) centripetal reaction (C) centrifugal reaction (D) centripetal acceleration.

529. When a mixture of mercury and water in a vessel is rotated using a centrifuge, the highest centrifugal reaction is experienced by (A) water (B) mercury (C) both water and mercury (D) vessel.

530. The tides due to the sun and moon can be explained by (A) Kepler’s first law (B) Kepler’s second law (C) Newton’s third law (D) law of gravitation.

531. When the distance between two celestial bodies is increased by two times the original distance, the gravitional force between them

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(A) increases by 2 times (B) decreases by 2 times (C) increases by 4 times (D) decreases by 4 times.

532. The weight of an object is slightly higher near the poles than that at the equator, due to earth’s (A) atmosphere (B) spherical shape (C) geoid shape (D) magnetic field.

533. The part of a heat engine that converts linear movement into circular motion is (A) crankshaft (B) piston rod (C) piston (D) cylinder.

534. Efficiency of an engine which performs work of 400 joules by using 1000 joules of heat energy is (A) 80% (B) 60% (C) 40% (D) 20%.

535. The ray that bends most in the dispersed light when sunlight is passed through a prism is (A) Red (B) Blue (C) Orange (D) Violet.

536. When monochromatic light is passed through benzene, the scattered light is (A) monochromatic (B) polychromatic (C) coherent (D) of the same wavelength.

537. In a spectrometer collimator consists of (A) lens and slit (B) prism (C) telescope (D) source of light.

538. The ultrasonic wave sent by a Sonar takes 4 seconds to return. The distance of the object is [ the velocity of sound in water is 1·5 km/sec ] (A) 6 km (B) 3 km (C) 2 km (D) 1 km.

539. The principle of working of radar gun used by traffic control authorities to detect vehicles crossing speed limit, is (A) Raman effect (B) Rayleigh scattering (C) Tyndall effect (D) Doppler effect.

540. The end stage of sun like stars is (A) Black dwarf (B) Black hole (C) White dwarf (D) Neutron star.

541. The velocity of recession of celestial bodies is directly proportional to (A) mass (B) period of rotation (C) distance (D) volume.

542. How many times is a star of magnitude + 1 brighter than a star of magnitude + 3 ?

(A) 6路25 (B) 6路15 (C) 6路05 (D) 6路00.

543. The difference between normal hydrogen 1 H 1 and dueterium 1 H 2 is caused by particle (A) Proton (B) Electron (C) Positron (D) Neutron.

544. The main source of electricity for artificial satellites is (A) dry cells (B) solar cells (C) acid cells (D) dynamo.

545. The reason for painting the copper pipes with black paint in solar water heater is to (A) reflect sunlight (B) prevent the heat loss (C) absorb solar energy (D) prevent copper from reacting with air.

546. To solve the problem of energy crisis to some extent the device that you may recommend is (A) pressure cooker (B) firewood stove (C) kerosene stove (D) electric stove.

547. In the refining of copper the mass of cathode (A) decreases (B) increases (C) decreases gradually (D) remains as before.

548. The most reactive metal among the following is (A) Zinc (B) Magnesium (C) Iron (D) Sodium.

549. In the extraction of amorphous silicon, the purpose of washing the products is, to (A) dissolve silicon (B) dissolve magnesium oxide (C) purify magnesium oxide (D) remove excess of silica.

550. Silicones are used as insulators in electric motors because they (A) become soft on heating (B) have low resistance (C) do not become soft on heating (D) are thermoplastics.

551. One of the characteristics of isomer is (A) different molecular formul (B) same structural formula (C) same physical and chemical properties (D) same molecular formula but different structures.

552. The reason for adding ethyl mercaptan to liquefied petroleum gas is, to (A) increase the efficiency of the stove (B) prevent leakage of LPG (C) detect leakage of LPG easily (D) save fuel.

553. How many moles of oxygen are necessary for the complete combustion of two moles of butane ?

(A) 10 (B) 11 (C) 12 (D) 13.

554. An example for polymer is (A) chloroprene (B) polythene (C) carbolactum (D) vinyl chloride.

555. In the manufacture of cement the reason for adding gypsum is, to (A) harden quickly (B) make the concrete mix smooth (C) increase the binding force (D) prevent rapid setting.

556. The use of plastic should be minimised because they are (A) biodegradable (B) non-biodegradable (C) expensive (D) brittle.

557. The boiling method of softening hard water is not suitable when which of the following salts are present in hard water ?

(A) Ca ( HCO 3) 2 (B) Ca ( HCO 3) 2 and Mg ( HCO 3) 2 (C) Mg ( HCO 3) 2 (D) Mg Cl 2 and CaSO 4 .

558. The acid that is not related to saponification reaction is (A) Sulphuric acid (B) Stearic acid (C) Oleic acid (D) Palmitic acid.

559. The use of detergents should be minimised because they (A) are expensive (B) are pollutants (C) remove the colour of cloths (D) decrease durability of cloths.

561. Phycoerythrin and phycocyanin are found in (A) red algae (B) blue green algae (C) brown algae (D) green algae.

562. The number of chambers in the heart of birds is (A) one (B) three (C) two (D) four.

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563. In bryophytes, root like structures are called (A) tap root (B) fibrous root (C) rhizoids (D) prop root.

564. In animals, fat is stored in (A) areolar tissue (B) cartilage tissue (C) adipose tissue (D) reticular tissue.

565. The study of tissue is called (A) Cytology (B) Embryology (C) Histology (D) Pathology.

566. The tissue used to prepare gunny bags is (A) Parenchyma (B) Collenchyma (C) Sclerenchyma (D) Phloem.

567. The function of hormone can be compared to the function of a (A) messenger (B) storekeeper (C) convenor (D) manager.

568. Small insects entering the ear can be removed by filling the external ear with (A) hot water (B) salt water (C) ice water (D) warm coconut oil.

569. The brain of an adult man weighs about (A) 1400 gms (B) 1600 gms (C) 2000 gms (D) 1200 gms.

570. Test to detect H.I.V. is (A) Heart test (B) R.B.C. test (C) ELISA test (D) Urine test.

571. Hepatitis B is dangerous since it damages (A) brain (B) liver (C) heart (D) intestine.

572. The disease which is not spread by using public toilets is (A) Cholera (B) Malaria (C) Hepatitis B (D) AIDS. 573. A person is suffering from a disease known as dropsy. The adulterent which causes it, is (A) mineral oil (B) argemone oil (C) coconut oil (D) kerosene oil.

574. The instrument used to test the density of milk is (A) Thermometer (B) Lactometer (C) Manometer (D) Hydrometer.

575. One should examine for which of the following certifications while purchasing packed food in the market ?

(A) WHO mark (B) ISI mark (C) FAO mark (D) ISO mark.

576. Which of the following bacteria takes part in denitrification ?

(A) Pseudomonas (B) Nitrosomonas (C) Nitrobacter (D) Rhizobium.

577. Growing broad leafed plants helps in (A) cutting the wind speed (B) reducing sound pollution (C) reducing air pollution (D) beautifying the sorroundings.

578. Smog is more common in (A) industrially dense area (B) hilly area with thick vegetation (C) river valley area (D) area with closely built-up villages.

579. The disease ‘Minamata’ is caused by an industrial pollutant named (A) Lead (B) Chromium (C) Mercury (D) Cadmium.

570. D.N.A. fingerprint technology has found significance in the field of (A) Genetics (B) Forensic science (C) Agricultural science (D) Physiology.

571. Knowledge of cloning promotes (A) creation of living things by asexual method (B) destroying dangerous living species (C) controlling population explosion (D) creating living things by sexual method.

572. In a conductor, a changing magnetic field linking a conductor induces (A) resistance (B) motor force (C) electromotive force (D) magnetic force.

573. The organ which shows visible response in the unit of nervous system is (A) receptor (B) effector (C) regulator (D) conductor.

574. The movement of a chemical substance from the reservoir pool to the exchange pool is called (A) recycling (B) diffusion (C) fixation (D) chemical recombination.

575. D.N.A. fingerprint technology has found significant application in the field of

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(A) genetics (B) forensic science (C) agricultural science (D) physiology.

576. Sclerenchyma fibres are used in making gunny bags because they are (A) elastic and flexible (B) thick and long (C) irregular and short (D) short and hard.

577. The instrument used to test the density of milk is (A) thermometer (B) hydrometer (C) lactometer (D) barometer.

578. Phycoerythrin and phycocyanin are found in (A) green algae (B) blue algae (C) brown algae (D) red algae.

579. A person is suffering from a disease known as dropsy. The adulterant which causes it, is (A) mineral oil (B) argemone oil (C) lubricant oil (D) kerosene oil.

580. The sound waves ultimately reach the organ of Corti through (A) Endolymph (B) Perilymph (C) Eustachian tube (D) Auditory canal.

581. The disadvantage with genetically modified plant is (A) absence of flowers (B) inability to produce seeds (C) sterility of seeds (D) absence of fruits.

582. Mammals are warm blooded animals. So their body temperature (A) varies according to seasons (B) depends on the age (C) according to the thickness of hair (D) remains constant irrespective of the environment.

583. To reduce air pollution, the chimney in an industry must be altered by (A) increasing the height (B) increasing the diameter (C) decreasing the number (D) decreasing the diameter.

584. A ganglia is formed by several (A) dendrites (B) nerves (C) neurons (D) axons.

585. The skeletal system in human body provides support (A) only externally (B) both internally and externally (C) only internally (D) partially.

586. The hormone which helps in the development of feminine characteristics is (A) testosterone (B) androgen (C) progesterone (D) estradiol.

587. The shape of muscles found in oesophagus which helps in peristaltic movement is (A) spindle (B) square (C) columnar (D) circular.

588. The process of conversion of ammonium salts into nitrates and nitrites is (A) ammonification (B) denitrification (C) biological fixation (D) nitrification.

589. The tissue endothelium found in blood vessels is referred as (A) cuboidal epithelium (B) squamous epithelium (C) ciliated epithelium (D) stratified epithelium.

590. A boy sees a snake while playing in the garden. He shouts for help in fear. The hormone secreted in his body at that time is (A) cortisone (B) noradrenaline (C) adrenaline (D) dopamine.

591. Ancient photographs of Monalisa are given to you. The E.M.R used to identify the originality of these photographs is A. UV rays B. Infrared Rays C. Ultrasonic waves D. gamma rays 592. The radiation used to get drinking water without using chemical is A.X – rays B. UV rays C. Infrared rays D. Microwaves 593. The scientist who designed the first commercial steam engine is – A. J. Verne B. Robert Goddard C. Thomas Saveri D. Joule 594. A mechanic detects the problem in carburetor of a vehicle. The possible problem faced by the rider is A. Problem in piston movement B. Fuel does not burn C. Exhaust stroke cannot be finished D. fuel and air do not mix properly

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595. Which one of the following can be used by an astronaut to estimate the speed of the galaxy and

rotation of the planets?

A. Hubble law B. Raman effect C. Doppler effect D. Rayleigh scattering 596. Kaiga nuclear power plant in our state is enclosed by concrete building because ……………….

A. To sustain chain reaction.

B. To prevent hazardous on human health C. It helps for nature D. To prevent the spread of nuclear radiations to the nature.

597. The raw material used to prepare fungicides and cosmetics is …

A. Compressed natural gas B. Paraffin wax C. Petroleum D. Aromatic substances 598. An example for the thermosetting plastic is ……………….

A. Polythene B. Bakelite C. Nylon-66 D. Polyvinylchloride 599. The common chemical used in the preparation of soap and detergent is …

A. Fatty acid B. Sodium chloride C. Hydrocarbon D. Aluminum chloride 600. An example for thermoplastic is ………………

A. Polythene B. Bakelite C. Polystyrene D. Thiokol 601. The gap between the two successive neurons is called ………

A. Dendrite B. Axon C. Synapse D. Myelin 602. In higher organisms sense organs are called ……………..

A. Receptors B. Conductor C. Effecter D. Non conductors 603. The role of CFTRI is to ………………………..

A. certify the quality of food B. Control the illegal activities of the traders C. sanction the license for traders D. Research and improve the quality of the food 604. The reason of consuming insects by insectivorous plants is………………………

A. To obtain nitrogen B. To obtain oxygen C. To obtain carbon dioxide D. All the above 605. A person is suffering from numbness of tongue, limbs and lips deafness and blindness.These are the symptoms of……………

A. Dropsy B. Jaundice C. Minamata D. Cholera 606. A limbless amphibian is (A) Frog (B) Toad (C) Salamander (D) Ichthyophis.

607. Jaggery and sugar are used as adulterants in (A) honey (B) juice (C) sweets (D) chocolates.

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1 MARK QUESTIONS 1. How many times the first magnitude star is brighter than the third magnitude star?

2. Compact fluorescent tubes are more suitable than the Incandescent electric bulbs to save electric energy. Why? 3. What is the reason for the enormous energy of sun.

4. Calcium bicarbonate is dissolved in water. Write the equation that takes place when it is boiled?

5. What is centripetal force?

6. In the power stroke of a petrol engine the piston is pushed with great force. Why? 7. Mention the genetic material and enzyme present in HIV. 8. Mention two Agricultural wastes which flows into the Natural water bodies.

9. Write any one function of Phagocytes present in Lymph tissue.

10. Why should FPO conduct quality tests of food products periodically?

11. Define centripetal force.

12. Why does a runner while running in a sharp curved path lean inward ?

13.What is magnitude scale of a star ?

14. In Karnataka state generally load-shedding is done during summer. Why ?

15. What is conservation of water ?

16. What is the reason for enormous energy output of the sun ?

17. What is Inflorescence ?

18. Even though there is production of hydrochloric acid in the inner wall of stomach, it will not be damaged. Why ?

19. Now it is preferred to use organic manures in place of chemical fertilizers in agricultural field.

Give reason.

20. A boy with HIV positive was denied admission in a school. The court did not approve this. What scientific justification do you make on this ?

21. Name the two products obtained along with water when hard water containing calcium bicarbonate is boiled.

22. Mention any two methods by which the induced e.m.f. can be increased in a dynamo.

23. A person wrongly purchases a centrifugal governor to transfer a liquid from a low pressure region.

Name the device that the person should have purchased instead of centrifugal governor.

24. Why is a bent copper pipe used in a solar water heater ?

25. How is the use of good roads profitable to owners of the motor cycles ?

26. Why are normal butane and isobutane called isomers ?

27. Why is the skin of frog always moist ?

28. What is the disorder caused due to less secretion of parathormone in human body ?

29. Assume that you are attacked by two robbers as you walk alone. At that moment you start running at a great speed. Which harmone produced in the body is responsible for getting that speed ?

30. Mention any one of the special characteristic features of tissue culture laboratory.

31. Why does a runner lean towards the centre of the curves while running in a curved path ?

32. When a mixture of fine sand, sawdust and water are rotated in a centrifuge, sand moves away towards the edges. Why ?

33. Write any two uses of solar cell.

34. What is biotechnology ?

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1 MARK QUESTIONS 35. We need to avoid eating coloured ice candy sold on road sides. Why ?

36. A baby born deaf may also be dumb. Why ?

37. A diabetic patient who is losing weight drastically may feel more chill than a non-diabetic person. Why ?

38. What is a heat engine ?

39. A composite light containing yellow, blue and orange colours is passed through a prism.

Which colour bends the most ?

40. What is the minimum frequency of sound wave needed to prepare emulsion from two immiscible liquids ?

41. By how many times a 3rd magnitude star is brighter than 5th magnitude star ?

42. Calcium bicarbonate causes hardness in water but not calcium carbonate. Why ?

43. What is Saponification ?

44. A boy observes the cross-section of an angiosperm stem under a compound microscope.

He infers that the leaves of that plant have parallel venation. What observation led him to arrive at this inference ?

45. Write any one function of cerebellum.

46. It is found that desired genes can be transferred from one plant to another plant.

Write any one advantage of this process to the plant.

47. A fish which has escaped from a fisherman’s net has lost one of its pectoral fins. What difficulty will it face while swimming ?

48. A cyclist going round a curve leans towards the centre of the curve. Give reason.

49. What is a centrifugal Governor?

50. What is the colour of the star Betelgeuse?

51. Mention the purpose of using a plane glass sheet in a solar cooker?

52. How does the pressure cooker help in saving energy?

53. Write the balanced chemical equation of the reaction between sodium carbonate and calcium chloride.

54. What is biotechnologY? 55. Which important characteristic feacture of selaginella depicts that it is highly evolved than Riccia?

56. Ramya experiences numbness in her limbs due to accumulation of watery fluids, name the disease and adulterant that has caused it.

57. Why is goiter called an endemic disease?

58. What is centripetal force?

59. How do the roads constructed at the bends on a level road?

60. Solar cooker is covered with a transparent plate of glass -Give reason.

61. State Hubble's law.

62. Write the remedial measure that can be taken by a cattle raring person in order to minimize the energy crisis.

63. Name any four salts that cause hardness of water.

64. Man is a Chordate, why ?

65. Why should be the air pressure in middle and outer ear equal in man?

66. Name any two diseases caused due to the consumption of adultrated food.

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1 MARK QUESTIONS 67. Define biotechnology 68. What is centrifuge?

69. Why does a cyclist lean towards the centre of the curve while moving in a curved path?

70. Which are the two regions of solar atmosphere?

71. How many silicon solar cells of 2 sq.cm. area are to be connected in a solar panel to produce 20v?

72. A person starts to use bicycle instead of a motor cycle.If others also follow this method then pressure on which source of energy can be minimized ?

73. What are the possible harms occurring with the continuous use of hard water in boilers?

74. Name any two plants which are having thallus.

75. "Photochemical smog and acid rain are curse to man kind" why?

76. Write any one of the application of DNA finger print technology.

77. Which substance is mixed as a adultrant in ghee?

78. In centrifuge how are particles of different densities separated ?

79. What is centripetal force ?

80. Name our Galaxy.

81. What happens when the glass cover on the solar water heater panel is removed ?

82. Karnataka Government has undertaken a programme of distributing fluorescent tubes. How is it a remedy for energy crisis ?

83. How do you test that water supplied to your home is temporarily hard water ?

84. What is recombinant DNA technology ?

85. Write two salient features of chordates.

86. Write the function of the gland which is embedded in the gland shown below ?

87. A boy who resides near a power loom has developed a habit of speaking loudly everywhere.

Give a scientific reason.

88. What is centrifuge?

89. Give an example for centripetal force.

90. What are binary stars?

91. Name the process by which the sun emits energy 92. How are CFC ‘s better than other bulbs that we use in our house ?

93. Name the ions which causes hardness in water.

94. What is endothelium?

95. Meristematic tissue in plants is called meristem. Why? 96. What is reflex action?

97. Which is called the chemical factory of the body?

98. What is the efficiency of heat engine?

99. What is a neutron star?

100. Silicon is a semiconductor. Give reason.

101. Black colour is used to paint copper pipes. Why? 102. How is permutit obtained?

103. A man identifies the leakage of L.P.G. by the smell of a chemical .Name it.

104. How is aerolar tissue helpful to our body?

105. Adulterated foods of metanil yellow colour have to be rejected .Why? 106. Mention the differences b/w gaseous and sedimentary cycle.

107. Write any 2 applications of tissue culture.

108. Bryophytes are grown in the garden in rainy season. How can you make sure that they are Bryophytes?

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109. Write any two functions of Epidermal tissue.

110. Xylem is called water conducting tissue and phloem is called food conducting tissue.Why? 111. How does nose detect the smell?

112. How is Hepatitis is caused in a person?

113. Ramamani buys adulterated butter from market. Explain the test conducted to confirm it.

114. Give an example for centripetal force.

115. Mention the use of Centrifuge.

116. What is photosphere?

117. Copper pipes are bent in solar water heater. Why? 118. Give any two reasons for energy crisis.

119. Name the ions causing permanent hardness in the water.

120. What is Metamorphosis?

121. Mention the functions of adipose tissue.

122. What are voluntary and involuntary Muscles ?

123. Name the chemical which causes acid rain 124. What is a photocell?

125. What is E.C.G.?

126. Solar cooker is painted with black colour. Why? 127. Write the general formula for carboxylic hydrocarbons.

128. When hard water is boiled in the laboratory, a gas is liberated. If it is passed through lime water, it turns milky. Name the salt present in hard water.

129. What is hard water?

130. Give any two examples for egg laying mammals.

131. What is lymph?

132. Which is the center for reflex arc?

133. What is clone?

134. Why is diode used as a rectifier?

135. What is centrifuge?

136. State the Doppler Effect.

137. What is the role of coolant in nuclear reactor?

138. How does the use of biodegradable waste like cow dung decrease the energy crisis?

139. Write the example equation of manufacture of soaps 140. Pteridophytes are called tracheophytes. Why? 141. Goitre is called endemic disease. Why? 142. We should buy processed food with AGMARK label. Why? 143. Define biotechnology 144. What is centrifugal reaction?

145. When a shallow dish, containing some mercury and water is rotated about a vertical axis, then why does water stay at the centre and the mercury at the edge?

126. What is luminosity of a star?

127. Which radiation do you use to separate real and artificial gems from the heap?

128. What is the time taken to reduce radium from 1 mg to 0.125 mg?

129. In solar water heaters copper pipes are bent into coils. Give reason.

130. Ramesh observes a plant and decides that it belongs to dicot. How? 131. Adiantum is more evolved than Riccia. Justify the statement.

132. How does cuticle help for the aquatic plants?

133. What is meant by green house effect?

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Fill in the blanks with suitable terms 1. A p-n junction allows current to pass in one direction. This is called________ 2. Radar gun works on the principle of -____________ 3. The device which converts light energy into electrical energy is _____ 4. When a metal is heated its resistance________ 5. The effect that helps us to know about rings of Saturn is ______ 6. The chain reaction in which four hydrogen nuclei fuse into one helium nucleus with the liberation of energy is ________ 7. The type of semiconductor obtained when silicon is doped with phosphorous is_____ 8.Ultrasonic waves are emitted from the SONAR. These waves are reflected by the ocean bottom and reach the detector in 3sec,The depth of the ocean is ______ 9. The part which helps to store large amount of heat energy inside the solar cooker is_____ 10. The gravitational force between earth and an object of mass 10 kg on its surface in newtons is …… .

11. ‘I’ is the intensity of scattered light of wavelength λ. The mathematical form of the statement “Intensity of scattered light is inversely proportional to fourth power of its wavelength” is ……

12. Name of the simplest hydrocarbon is ………………………… .

13. Valency of dopant of base region of n-p-n transistor is ………………………… .

14. The principle used in tracking of artificial satellite is ……………………………… .

15. The process of slow cooling of glass is called ………………………………………

16. The spectrum obtained from candle flame is called ……………………… .

17. Speed of the star is estimated by using the effect stated by the scientist …………… .

18. The arrangement of solar cells in series is called a …………………… .

19. The device that converts solar energy directly into electrical energy is called …………….

20. In radio transmitter audible sound will be converted into corresponding electrical signals by the device …… ……

21. In a person, kidney stones are formed. The sound waves to remove these stones are called …… .

22. The valency of the dopant used in the base region of p-n-p transistor is ________.

23. The velocity of ultrasonic sound waves in water is 1.5 km/s. The distance travelled by those waves in 2 seconds is _____________ km.

24. The device which converts solar energy into electrical energy is _________.

25. The more doped region in the transistor is ……………………………… .

26. The velocity of ultrasound in water is 1·5 km/s. The distance travelled by it in water in 3 seconds is …………………………… .

27. The device used to provide electricity in the instruments of artificial satellites is ………… .

28. To offer low resistance, diode should be biased in -------29. If ultrasounds are used to check human heart, then it is called ---30. In solar water heater copper pipes are bent as coils so as to form ………………….

31. The range of audible sound is ------------32. The device used to blow air and petrol is …………..

33. Non metal used in solar cells is .............................

34. The device used to convert alternate current(AC) into direct current(DC) is -------35. The device used to remove the grease and dirt from the clothes is -------------------36. The gas obtained by cow dung is ……………

37. The minimum velocity to be given to an object to escape from the earth’s gravitational force is -----

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38. The ultrasonic waves sent by a SONAR in water return in 3 sec. If the velocity of sound in water is 1.5 km/s, then the distance travelled by the ultrasonic waves is…..

39. Chemical name of water glass is .....................

40.The technique is to be used by Annirudha to detect the fault in the engine parts of his car is ---------41. The first sounding rocket designed completely in India is -------------42. During beta decay of 14C6 the mass of newly formed nucleus is ………..

43. Solar cooker box is painted with black colour because ………

44. An ultrasonic impulse sent from the surface of ocean to its bottom reaches the bottom and returns after 6 seconds. The depth of the ocean is ------- km.

45. The type of glass used in the preparation of spectacle lens is ………….

46. Temporary hardness is removed by the addition of …………chemical.

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SCIENCE : 2 MARKS QUESTIONS 1. Draw a neat diagram of a D.C. dynamo.

2. Name the electromagnetic waves that lie in between Radiowaves and Infrared rays in electromagnetic spectrum. Mention any three applications of these waves.

3. The period of revolution of a satellite around the earth is 24 hours. What is that satellite called ? Mention the main objective of launching such satellites. Write the equation showing the relationship between orbital velocity and escape velocity.

4. Draw a neat diagram of a “single stage rocket”.

5. What are sun-spots ? How are they caused ? Why do they appear dark ?

6. What is Transmutation ? Identify the parent nucleus and daughter nucleus in the following transmutation : 88 Ra 226 — 86 Rn 222 7. Mention any four hazards to human health that may be caused due to radioactive radiations.

8. Mention any two differences between “Alkanes” and “Alkynes”.

9. How does boiling remove the temporary hardness of water ? Explain it, with Balanced chemical equations.

10. a) What are Heat Engines ? How are they classified broadly ? b) Explain the Power stroke of a petrol engine. c) Write the formula for the efficiency of a heat engine.

11. Which characteristic of vertebrates made them get ready to live on land ? Give one example.

12. Draw a sketch to show the structure of pistil in a typical flower and label the parts.

13. Why are xylem tubes considered as complex permanent tissue ?

14. As per government regulations it is compulsory to wear a helmet which covers up to the neck region. Give scientific reason.

15. A farmer mixes Anabena and Nostoc along with the manure in his paddy field.

What will be the effect on yield and why ?

16. Draw a neat sketch of the graphs showing the direction of the induced current in both A.C. and D.C. dynamos.

17. Draw a neat sketch of a single stage rocket.

18. What are geo-stationary satellites ? Write any one use of geo-stationary satellites.

At what height should they be located ?

19. What is a galaxy ? Mention the types of galaxies.

20. Write the structural formulae of Isobutane and Cyclohexane.

21. During beta decay of a radioactive element, what changes take place in the nucleus of an atom ? Represent the changes taking place in the transmutation of radio carbon by beta emission.

22. Give one reason for each of the following : a) Fissionable material should have certain critical size. b) People working in nuclear power station wear lead jackets.

23. Softening of hard water by boiling is easiest, yet we need to consider other methods of softening. Why ?

24. Write any two differences between laser light and ordinary light.

25. Draw a neat diagram of a blast furnace.

26. In a petrol engine write a function for each of the following : i) Crankshaft ii) Carburettor iii) Spark plug iv) Inlet valve 27. Draw a neat diagram of root system in monocot plant.

28. Name the protein that gives red colour to the blood. What is its function ?

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29. After relay race, Runner-A, pours glucose powder into his mouth. Runner-B tastes the glucose slowly with tip of his tongue. Whom do you think, experiences the sweetness most ? Why ?

30. Nowadays birds are decreasing in thickly populated area. Give two reasons.

31. Mention two pollutants, which pollute public water sources in rural areas.

32. State Faraday’s laws of electromagnetic induction.

33. Draw the graph of induced current in each of A.C. and D.C. Dynamo.

34. Draw a neat diagram of gas laser tube.

35. Mention any four limitations of external combustion engine.

36. It is found that pig iron obtained from blast furnace contains more quantity of silica and carbon. What are the reasons for the presence of these impurities. How can this mistake be corrected in future?

37. What is the role of magnesium and hydrochloric acid used in the extraction of silicon.

38. What is annealing of glass? Why it is done?

39. Draw a neat diagram of the column used in the softening of hard water by permutit process.

40. Write the circuit symbol of n-p-n and p-n-p transistors.

41. What is the significant characteristic acquired by Pteridophytes in the process of Evolution? Give two examples for Pteridophytes.

42. a) How is the Stomach wall protected against the acidic contents secreted in it? b) Why should heart have involuntary muscle?

43. a) Due to what reason blood from retina would seep into Vitreous humour? b) What is the treatment for this condition?

44. Mention any two precautionary measures taken to prevent infection of HIV. 45. Mention the four aspects that a person must check while purchasing a sealed Drinking water bottle.

46. Which aspect of biotechnology do you suggest to a farmer who is at loss in cultivating rose plants? And why?

47. Draw a neat diagram of a DC motor.

48. Electricity is produced when a bar magnet is thrust into the conducting coil. What steps do you take to increase the electric current in the coil ?

49. Draw a neat circuit symbol of n-p-n transistor and diode.

50. Draw a neat diagram of internal combustion engine which is in the stage of power stroke.

51. What is the alloy you prepare if you are given copper and tin ? Give one use of the alloy.

52. When nitric acid is added to detect the presence of copper present in ornamental gold, what is the compound of copper formed ? Why does not gold change ?

53. What is cement ? Name the substance which prevents too rapid setting of cement.

54. Write four reasons about acute shortage of drinking water.

55. What is the element produced when silicon dioxide reacts with magnesium ? Write The equation of the chemical reaction.

56. Draw a neat diagram of the permutit tower used to soften hard water indicating the positions where hard water is sent in and soft water is drawn out.

57. Mention two properties and two uses of Laser.

58. Draw a neat diagram indicating the dispersion of composite light and recombination of colours.

59. Write one difference between solar flares and solar prominences.

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60. Draw a neat schematic diagram of the structure of the sun to indicate clearly the solar core and solar zones.

61. a) Why does the size of copper cathode increase during the purification of copper By electrolysis ? b) Why does a goldsmith mix a small amount of copper to gold to make ornaments 62. Explain the extraction of amorphous silicon.

63. What are thermoplastics ? Mention one use of each of the following : a) Polythene b) Nylon-6.

64. Mention two characteristics of aromatic hydrocarbons. Write the structures of the following : Ethyne b) Benzene.

47. Mention any two salient features of reptiles. Mention any one major difference between reptiles and mammals.

65. A person is subjected to blood test. It is found that the glucose level in the blood has increased and is also urinating frequently. a) From what disease is the person suffering ? b) What hormone should be administered to control this disease ?

66. Name the four types of cells present in xylem tissue.

67. How does Hepatitis-B transmit from one to another ?

68. Generally yellow coloured cold drinks sold in shanties and fairs, should not be consumed. a) Which disease will we be affected by this ? b) Name the adulterant present in this cold drinks.

69. “In the previous year a farmer had grown groundnut in his field. This year he has thought of growing ragi crop in the same field and has decided to use lesser quantity of fertilizers.” a) What is the reason for the above decision taken ? b) What crop can he cultivate in the same field next year ?

70. Write common parts present in motor and dynamo.

71. Draw a neat diagram of DC motor.

72. Write any two experimental facts regarding photoelectric effect.

73. Draw a block diagram of radio receiver.

74. Draw a neat diagram of external combustion engine.

75. What is the product formed when heated aluminium powder is sprinkled in a gas jar containing chlorine ? Write balanced chemical equation of the reaction.

76. a) How is the substance used in grinding tools prepared from silicon and coke ?

77. What is hard water ? Name two salts which cause temporary hardness in water.

78. Mention any two functions of the secretion of lacrimal glands.

79. List out the common adulterants that may be present in the following : a) Honey b) Turmeric powder c) Coffee powder d) Pepper.

80. Thyroid gland of a 40 year old person is underactive. List out any four symptoms of the disorder that the person might be suffering from.

81. What are the main differences between the two types of biogeochemical cycles ?

82. What was the need for vertebrates to evolve from oviparity to viviparity ?

83. A doctor advises a person to shift his residence from the midst of the city to city outskirts, where lots of lichen growth is found. What may be the reason behind this advice ?

84. Draw a neat diagram of AC dynamo and label the parts.

85. A robot sent to the moon sends a laser light towards the earth. If it takes 1·3 seconds to reach the earth then calculate the distance between moon and the earth in kilometres. ( Given : Velocity of light is 3 × 108 m/s )

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86. Write two differences between intrinsic semiconductor and extrinsic semiconductor.

87. Write two differences between centripetal force and centrifugal force.

88. Two masses m 1 and m 2 are separated by a distance d. Find by how many times The force of gravity increases if mass of each of the objects is doubled without change in the distance between them.

89. Which reaction is responsible for solar energy ? Name the major component of solar energy that reaches us.

90. Draw a neat diagram of electrolytic cell used in the purification of copper and label The following : Anode b) Cathode.

91. Explain the method of extraction of amorphous silicon using silica.

92. Draw a neat diagram showing permutit process of softening hard water and label the following : a) Zeolite layer b) Soft water layer.

93. Differentiate between the two types of root systems found in angiosperms.

94. What are Dendrites and Axons ? Write any one difference between them.

95. The rate of heart-beat and breathing has increased in a person, while running in a race. After sometimes the heart-beat and breathing becomes normal. Which two components of the nervous system control these processes and how ?

96. A person living in a coastal area is suffering from nervous problems and protruded eyes. What may be the cause for this condition ? How can it be controlled ?

97. Which are the four methods of HIV transmission ?

98. As a consumer what are your roles and responsibilities in preventing food adulteration ?

99. Write any two factors on which the induced EMF depends.

100. Draw a neat sketch of a D.C. Dynamo 101. What is electromagnetic spectrum? a) Name the electromagnetic radiations which has 1. the lowest frequency and 2. lowest wavelength 102. Draw a neat sketch to show the exhaust stroke of an external combustion engine.

103. Give scientific reasons for the following a) Iron articles are electroplated with chromium b) Calcium silicate is a protective layer for the molten iron in the blast furnace c) Copper is not used to prepare Hydrogen in the laboratory d) Ore of copper is not concentrated by hydraulic washing.

104. What is the role of magnesium and dilute hydrochloric acid in the preparation of silicon.

105. Write the steps involved in recycling of plastics.

106. Name the two types of Hardness in water. On what principle can the hardness of water be removed?

107. Draw a circuit symbol of each of the following a) forward biased diode b) Transistor of npn 108. How are ear and throat connected? What is its advantage?

109. Raju resides in an area where not much of lichens are found. List any four health hazards he may be suffering from.

110. Explain the structure of HIV in 2 or 3 sentences.

111. Mention one function of the following: a) Sclerides b) Companion cells 112. How can vanaspathi in ghee be detected?

113. A student has uprooted a weed plant in the school garden. The student infers that It is a dicot plant. Support the inference.

114. Write any two differences between AC Dynamo and DC Dynamo

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115. Name the following process (1) In an atom, an electron from an orbit E1 raises to an orbit E2 (2) In an atom, an electron from an orbit E2 jumps to an orbit E1 (3) Atoms are raised from lower energy level to higher energy level (4) Supplying energy from external source, to raise the atoms to higher energy level 116. Draw the block diagram of a simple radio receiver.

117. Draw a sketch of external combustion engine showing exhaust stroke.

118. Choose the components used to prepare german silver and bronze from the Following : Copper, Zinc, Tin, Nickel.

119. How silicon carbide is obtained from silicon? Explain with the equation 120. What is polymerization? Name the monomers of the following. (1) Teflon (2) Nylon.

121. Angiosperms are considered as the most evolved plants in the plant kingdom, why?

122. Name components of xylem & phloem which have lignified wall.

123. How does the intelligence of man increase as thickness & convolutions of cerebral cortex increase?

124. Why pneumonia is not cured in an individual suffering from AIDS ?

125. What is food Adulteration? Write any two precautions taken by the government to control food adulteration.

126. What are the different stages of recycling which are responsible to consider carbon cycle as perfect cycle?

127. A magnet and a coil are moving in the same direction and with same speed e.m.f is not induced in the coil ? Give reason.

128. What are the factors influencing induced e.m.f?

129. Draw a neat labeled diagram of DC Motor.

130. Write any two uses of Ultraviolet ray in the field of medicine.

131. Give the circuit symbols of two types of transistor.

132. Draw a sketch of intake stroke of a petrol engine 133. Give reason for each of the following (1) Nichrome is used to make heating coils (2) Copper is mixed with gold while making ornaments 134. How is crystalline silicon obtained? Explain with the equation 135. What is annealing? What is its use?

136. Write one function of hormone Thyroxin and Adrenaline 137. Write any two differences between yellow spot and blind spot of human eye.

138. Name the different types of pollutions that effect human health.

139. List out any two main differences between HIV and HBV 140. Classify the following into Simple permanent tissues and Complex permanent tissues. (a)Parenchyma (b)Xylem (c)Phloem (d)Collenchyma 141. Classify the following vertebrates into three chambered and four chambered heart bearing animals (a) Frog (b) Pigeon (c) Cobra (d) Man 142. Differentiate between the two types of root systems found in angiosperms.

143. What are Dendrites and Axons ? Write any one difference between them.

144. The rate of heart-beat and breathing has increased in a person, while running in a race. After sometimes the heart-beat and breathing becomes normal. Which two components of the nervous system control these processes and how ?

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145. A person living in a coastal area is suffering from nervous problems and protruded eyes. What may be the cause for this condition ? How can it be controlled ?

146. Which are the four methods of HIV transmission ?

147. As a consumer what are your roles and responsibilities in preventing food adulteration 148. What should be the angle between thumb ( main ) finger, forefinger and central finger in Fleming’s left hand rule ? What does each finger indicate ?

149. Draw a neat diagram of AC dynamo and represent the current in it in the external circuit by a graph.

150. State the difference between laser light and ordinary light.

151. Draw a block diagram of a simple radio receiver.

152. Draw a sketch of petrol engine and label the parts.

153. A student dips a zinc plate in copper sulphate solution. Write the equation of the chemical reaction taking place. Which metal is displaced during this reaction ?

154. Explain the process of obtaining crystalline silicon with chemical equation.

155. Explain the steps involved in the manufacture of cement.

156. Write the equation of chemical reaction taking place when hard water containing calcium chloride is passed through permutit.

157. How do you test for vanaspati in ghee ?

158. Give reasons : a) It has been difficult to find medicines for HIV infection. b) Sclera and skin of the person suffering from jaundice turn yellow.

159. Why do drunken drivers tend to commit more accidents than others who do not drink and drive ? Mention the part of the brain which may not function properly during this time.

160. Trace the route of sound waves from outer ear to inner ear.

161. State two functions of areolar tissue.

162. Point out any two characters that support the idea that platypus is more evolved than tortoise.

163. Explain briefly the Faraday’s experiment 164. Draw a neat diagram of A.C dynamo 165. What is spontaneous emission?

166. Draw the block diagram of radio transmitter.

167. Write the balanced the chemical equation, if copper reacts with concentrated nitric acid 168. Write any two physical properties of crystalline silicon.

169. Draw a neat diagram of petrol engine showing intake stroke and label the parts.

170. What is annealing of glass ?

171. Write the methods of conservation of water.

172. List the differences between monocot and dicot plants 173. A frog is kept in the vessel having temperature of 300 C for some hours. Which organ of frog is unable to respire?

174. A person suffers from various infections and finally dies. Which disease is he suffering from?

What precautions should be taken to prevent it?

175. Name the adulterant used in following foods a. Milk b. Edible oil c. Pepper d. Rice 176. Rama lined in a place where there are no lichens. Name any four health problems of him.

178. Draw a neat diagram of DC dynamo.

179. Write the laws of Faraday’s electromagnetic induction.

180. Write any two experimental factors related to photo electric effect.

181. Draw the diagrams of forward bias and reverse bias.

182. Draw a neat diagram of petrol engine and label its parts.

183. What is meant by thermosetting plastic?How is it different from ordinary plastic?

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184. What is hard water? Mention any two problems of it.

185. Balance the following chemical equation. Zn + HNO3 --------- Zn +(NO3) +H2 Fe + Hcl ------------ Fecl2 + H2.

186. On what factors does the induced e.m.f. in a coil depend?

187. Draw a neat diagram of DC dynamo.

188. Draw a neat diagram of Helium – Neon gas laser.

189. Mention the differences between n-p-n and p-n-p transistors.

190. Draw a neat diagram of petrol engine.

191. Explain the concentration of copper ore.

192. Mention the difference between addition and condensation polymers.

193. What is meant by hard water? Water becomes hard. Why? 194. Write any four uses of silicon compound.

195. Mention the difference between Angiosperms and Gymnosperms.

196. Write the diagrams of parenchyma and collenchymas.

197. What are the functions of Rods and Cones?

198. What precautions should be taken to prevent H.I.V? 199. The people who had consumed food in a party are suffering from amoebiosis and vomiting.

Give Reasons.

200. The rose plant in Ramesh’s garden , which yielded once in a year, now yields twice. What technology is adopted by him in cultivation? What are the conditions necessary for it?

201. Mention any four applications of Ultra Violet radiations.

202. Write the circuit symbol of n-p-n transistor.

203. A cyclist gains stability while moving in a curve by leaning towards its centre. Give reason.

204. Which are the factors that have no influence on the gravitational force?

205. What is refractive index? Write its symbol.

206. Name the following : a. Dark spots found on the photosphere. b. The outermost layer of solar atmosphere.

207. What is induced radioactivity? Give an example.

208. List out any 4 uses of silicon compounds.

209. Avoid using hard water in boilers. Give reasons.

210. What are rhizoids?Mention its functions.

211. Even though lotus is found in water it does not decay. Give reason.

212. Write the symptoms of hepatitis B. 213. What is meant by food adulteration?Name the aduterants found in the following a)turmeric powder b)pepper.

214. Mention the effects of air pollution on human health.

215. A farmer uses nostoc for his paddy field.give reason.

216. State the Dynamo Rule.

217. Why is laser light coherent?

218. Draw the diagram of reverse bias of p-n junction.

219. Draw a neat diagram of single stage rocket and label its parts.

220. Draw a neat diagram showing Faraday’s experiment.

221. What are radio-isotopes? Give two examples 222. State the uses of invar steel and nichrome.

223. Mention the role of magnesium powder in the extraction of silicon by quartz 224. What is permutit ? Name the chemical used to regenerate it.

225. Assume that a farmer grows maize and dhal crops in his field together at a time.

During drought which crop dries first ?

226. Name 4 types of cells of water conducting tissue

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227. Which action of our body is not under the control of our brain? Give an example 228. What are the ways through which HIV is not transmitted ?

229. A farmer gets good yielding in paddy field by adding Rhizobium. Give reason.

230. How do you detect the presence of argemone oil in edible oil?

231. What is the radiography? Name the two radiations used in it.

232. What is meant by transmutation?

233. Mention four uses of porcelain.

234..What are the differences between black dwarf and black hole?

235. How is silicon obtained from ‘quartz’? Write the chemical reaction.

236. Draw a neat diagram of expansion stroke of an external combustion engine 237. Name any two ores of copper. Write their molecular formula 238. Draw a neat diagram of spectroscope.

239. Draw a neat diagram of the structure of sun and locate the sun spots.

240. Mention any two characteristic features of gymnosperms 241. Mention the difference between sporophytes and gametophytes 242. What is the role of consumer in preventing food adulteration?

243. Ramu is suffering from numbness of tongue , lips and limbs .Name the disease that he is suffering from.

244. Name the two types of biogeochemical cycles? Give an example for each.

245. Define the term biotechnology and D N A recombinant technology

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SCIENCE : 3 MARK QUESTIONS 1. State Kepler’s laws of planetary motion.

2. What is a spectroscope? Mention the functions of the following parts in the spectroscope. a) Collimator b) Telescope.

3. Eventhough there are no electrons in the nucleus of an atom, during beta decay electrons are ejected from the nucleus. How? ZXA → Y. This is an example for Alpha decay. What will be the atomic number and atomic mass of Y. Z XA → Y. This is an example for Beta decay. What will be atomic number and atomic mass of Y. 4. Draw a neat diagram of nuclear power reactor.

5. State Kepler’s first law and third law of planetary motion. What is the use of the third law ?

6. What will be the effect when monochromatic light is passed through benzene like organic liquids ? Who discovered this effect ? Give one use of this effect.

7. What is alpha emission from a radioactive element ? Write an example of transmutation of alpha emission.

8. Draw a neat diagram of nuclear reactor.

9. a) Explain the function of the following in a radio transmitter : i) Mixer ii) Oscillator. b) What is meant by forward biasing of a diode ? How does it affect the resistance ?

10. State Kepler’s laws of planetary motion.

11. Why does the mass number of the element remain the same during Beta decay ? The half-life of a radioactive element is 1600 years. What mass of 200 gms of that element is decayed in 4800 years ?

12. Draw a neat diagram of a D.C. motor.

13. a) What is orbital velocity ? b) Write the equation for the orbital velocity of satellite which is placed at a height of h metre from the earth. Write the meanings of symbols used. c) What is the relationship between orbital velocity and escape velocity ?

14. In the life cycle of stars explain the following stages : i) Proto star ii) Steady star.

15. Draw a neat diagram of blast furnace used in the extraction of iron and label any three parts.

16. Name the two types of star clusters. Write any two differences between them. Mention one use of study of star clusters.

17. Draw a neat diagram of nuclear reactor and label the following parts : a) Control rods b) Concrete shield.

18. a) Explain an experiment with chemical equation to establish that iron is more reactive than silver. b) Write the chemical equation representing the reaction of zinc with the following : i) Dilute hydrochloric acid ii) Dilute sulphuric acid.

30. State the universal law of gravitation. Prepare it by a mathematical equation.

31. What is impure spectrum? Why is Raman scattering called incoherent and ray height scattering called coherent scattering?

On what basis did Raman give satisfactory explanation of incoherent scattering?

32. A radio active element has a half life period of 8 days If measured how the mass of that element is 3.125g. What was its initial mass 40 days before.

33. Draw a neat diagram of the device that converts nuclear energy into electrical energy.

34. State the law of conservation of momentum “The escape velocity on the earth is 11.2km/s” What does it mean? How are orbital and escape velocities related to one another?

At what height Geostationary satellite is launched.

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30. State Kepler's three laws of planetary motion..

31. Imagine that you are a doctor by using which isotope you will treat.

(1) A person is suffering from Cancer (2) Growth of a person is retarded due to bulging of Thyroid gland 32. a) How can we obtain a line emission spectrum? b) Write the differences between Rayleigh scattering and Raman effect 33. Draw a neat labelled diagram of nuclear reactor and label the parts.

31) a) State the universal law of gravitation. b) Mention four points successfully explained by it.

32 a) How can overlapping of colours in spectroscope be minimized? b) What is the reason for dispersion? c) Mention the type of spectrum obtained by candle flame and light emitted from gases or vapours.

33. Write the name of the isotopes used in the following cases a) To find the age of fossil of Dynosars b) To study the action of medicines c) To determine the kind of phosphate required for Ragi crop.

34. Sketch the diagram of nuclear fission reaction and label neutron and fission fragments a) Calculate the number of neutrons liberated in the third stage of nuclear fission reaction liberating two neutrons when a nucleus gets fissioned 35. Explain the function of the constituents of plasma.

36. Draw a diagram to show the structure of a typical flower and label any two parts.

37. Write Kepler’s three laws of planetary motion.

38. a) The age of which of the following materials can be found by using radio-carbon ?

Quartz, Wood, Copper. b) Half-life period of radio phosphorus is 3 minutes. After its preparation it decays and in 12 minutes 2 grams of mass is remained. What was its initial mass when it was prepared ?

39. What is spectroscope ? Write functions of collimator and telescope of a spectroscope.

40. Draw a neat diagram of nuclear power plant and label the following parts : i) Moderator ii) Heat exchanger.

41. a) Mention one difference between nitrification and denitrification. b) The effluents released into the river by chemical industry is more than the norms.

What may be the effect on fauna in this river ? c) What role do saprophytes play in ecological balance ?

42. Draw the Diagram of neuron and label any two parts.

43. State the universal law of gravitation. Write the mathematical expression of this law.

44. Describe the experiment conducted by C. V. Raman to demonstrate Raman effect.

What is the use of this effect ?

45. A radio nucleus Z X A emits an alpha particle and becomes Y. Mention the atomic number and mass number of Y. What do you call the conversion of one element into another element ?

46. Draw a neat diagram of nuclear power reactor and label the parts.

47. Draw a neat diagram of H I V and label R N A and fatty layers 48. Explain the function of ears 49. a) State universal law of gravitation. Write the formula of gravitational force. b) Write an equation to state the relation between the object at a height ‘h’ above the ground and ‘g’.

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50. Write an application of each of the following: a) Diode b) Transistor c) Microphone in radio transmission.

51. How are three neutrons obtained from this equation. Explain .Mention the types of reaction.

92U235+0n1-->56Ba141+36Kr92+30n1+Energy 52. Write a neat diagram of preparation of soap. Label any 2 parts of it.

53. Draw a neat diagram of mustard plant and label its parts .

54. Explain the steps of sewage treatment.

55. Give scientific reasons for the following: a. Astronaut orbiting in a space craft experiences weightlessness. b. The value of acceleration due to gravity (g) varies on the earth. c. Gravitational law is called universal gravitation law.

56. Define the following: a) Visible spectrum b) Pure spectrum c) Impure spectrum 57. Draw a neat diagram of manufacture of cement. Label any two parts.

58. Write the functions of the following in the nuclear reactor a)Graphite b)Boron c)Plutonium 59. a)Draw a diagram of neuron and label its parts. b)What is synapse?

60. a)Where is pituitary gland located? b) List the functions of pituitary gland.

61. Explain the principle of rocket launching.

62. Explain the working of Steam Engine with a neat diagram.

63. a)Write a neat diagram of blast furnace label its parts. b) Name any two alloys of iron.

64.

A man had clear vision of near objects but could not see far object.

What defect has he in his vision? Give reason. How can it be corrected?

65. Define bio degradable and non bio degradable pollutants. Give an example for each.

66. State the three laws of Kepler.

67. Define the following: a) Line emission spectrum b) Fraunhofer lines 68. Write the uses of radioisotopes.

69. Write a neat diagram of nuclear reactor.

70. a. Half life of radium is 226 in 1600 years. We start with 1mg of radium. What is the amount of radium after 4800 years? b. Write any two uses of radio-isotopes.

71. a) Weight of an astronaut in the space is zero. Name this situation and give the reason for it. b) Weight of a person increases as he moves from the equator towards the North pole.

What is the reason for it?

72. What is spectroscope? Mention any one use of each of the following a) Line Emission Spectroscope b) Fraunhofer lines 73. Draw a neat diagram of nuclear power plant and label its parts.

74. Write a neat diagram of flower and label its parts.

75. Write the classification of plant tissue.

76. a)Which law of Kepler can be applied to calculate the mass of the sun b) Define weight. c) Write the value of Universal Gravitational Constant 77. Explain the following : a) Continuous emission spectrum b) Absorption emission spectrum 78. The value of ‘Z’ increases during beta decay. Why? 79. Where are the following isotopes used? a. Radio-phosphorus b. Radio-carbon 80. Write the schematic representation of chain reaction of U-235.

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