CBSE CLASS IX SCIENCE QUESTION PAPER SA II-2012

ORZK-SC1011

SUMMATIVE ASSESSMENT – II (2012-13) SCIENCE Class – IX Time allowed : 3 hours

Maximum Marks : 90

General Instructions :         

The question paper comprises of two Sections, A and B. You are to attempt both the sections.

All questions are compulsory.

There is no choice in any of the questions.

All questions of Section-A and all questions of Section-B are to be attempted separately.

Question numbers 1 to 3 in Section-A are one mark questions. These are to be answered in one word or in one sentence.

Question numbers 4 to 7 in Section-A are two marks questions. These are to be answered in about 30 words each.

Question numbers 8 to 19 in Section-A are three marks questions. These are to be answered in about 50 words each.

Question numbers 20 to 24 in Section-A are five marks questions. These are to be answered in about 70 words each.

Question numbers 25 to 42 in Section-B are multiple choice questions based on practical skills. Each question is a one mark question. You are to select one most appropriate response out of the four provided to you.

SECTION-A 1.

2.

3.

4.

What is the difference between 2H and H2?

1 Name the largest group of animals with jointed legs.

1 Name a gas mainly responsible for global warming.

1 Name the following 2 (a) Reptile which has a four chambered heart (b) Amphibians of the plant kingdom (c) Animals with spiny skin (d) Division among plants which has the simplest organisms.

5. Name the causal organism of AIDS. Why a person suffering from AIDS can not fight even very minor infections?

2 3

6. Define buoyant force. An object of volume 5 cm is immersed first in water and then in salt solution. In which case will it experiences a greater buoyant force ? What will be the effect on the buoyant force if the 3 volume of the object is increased to 8 cm ?

2 7. Define energy. Name and define its SI unit.

2 8. (a) Write down the chemical formula of sodium oxide and magnesium Hydroxide.

3 (b) What are polyatomic ions? Write one example. (c) What is the atomicity of phosphorous and ammonia?

9. The description of atomic particles of two elements X and Y is given below

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(i) What is the atomic number of Y? (ii) What is the mass number of X? (iii) What is the relation between X and Y? (iv) Which element/elements do they represent? (v) Write the electronic configuration of X? (vi) Write the cation/anion formed by the element.

10. Which of the following are isotopes and which are isobars?

3 Argon, Protium, Calcium, Deuterium. Explain why the isotopes have similar chemical properties but they differ in physical properties?

11. (a) Name the scientist who introduced the binomial nomenclature. (b) What is the scientific name of humans (c) Find the odd one out : Riccia, Funaria, Fern, Marchantia.

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12. How are pteridophytes different from phenarogames ? Give example for each group.

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13. Write the symptoms when following organs are targeted by microbes. (a) Lungs (b) Liver

3 (c) Brain.

14. What would be the apparent weight of an iron block of size 5cm x 5cm x 5cm when it is completely immersed in water ? (density of iron = 7.8 g/cm3) 3 15. A child of mass 35 kg is sitting on a trolley of mass 5 kg. The trolley is given a push by applying a force so that begins to move with a speed of 4 m/s. The trolley comes to rest after covering a distance of 16 m. Find (i) the work done on the trolley (ii) the work done by the trolley before coming the rest.

3 16. (a) An object of mass ‘m’ is moving with a velocity ‘v’ on a level ground. State the amount of work done by a person who wants to stop the object. Justify your answer. (b) A satellite of mass ‘m’ is moving round the earth with a speed ‘v’. State the work done by the force of gravity on the satellite. Justify your answer.

3 17. Give reasons for the following : (a) The reverberation time of a hall used for speeches should be very short. (b) A vibrating body produces sound. However no sound is heard when a simple pendulum oscillates in air. (c) Sounds of same loudness and pitch but produced by different musical instruments like a violin and flute are distinguishable .

3 18. (a) How is soil formed ? (b) What is soil erosion ? write two steps to control soil erosion.

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19. Amrita lived in a small city, nearby, there was a coal mine. Very close to the coal mine was a ‘Tiger Reserve’.

One day she heard her father talking to his friend about an upcoming power plant near to the coal mine, which is going to disturb the biodiversity of that area. She became alert; she had a talk with her father. She tried to tell her father about the consequences. The next day she told her friends and teachers and they started thinking of idea to sort out this matter.

Answer the following questions based on the above information: (a) What would be the consequences, Amrita thought after hearing the conversation between her father and his friend ? (b) Which values are displayed by Amrita by taking initiative ? (c) What do you think should Amrita do? How can she protest for this problem?

3 20. (a) Calculate the mass of 0.4 mole of water. (b) Calculate the number of atoms in 2.3 grams of Na. [Atomic mass- (Na=23u) (No=6.022 × 1023 per mole)] (c) A 0.24 g sample of a compound of Oxygen and Boron was found to contain 0.096g of Boron and 0.144 g of oxygen. Calculate the percentage composition of the compound by weight. (d) Define one atomic mass unit .

5 21. Classify phylum vertebrata into their further groups by giving two characteristics of each .

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22. a) Define Kinetic energy. Derive an expression for the Kinetic energy possessed by an object of ‘m’ moving with a velocity ‘v’ . b) A light and a heavy object has the same momentum Find the ratio of their kinetic energies. Which one has a larger Kinetic energy ?

5 23. A sound wave travelling in a medium is represented as shown in figure

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(a) Which letter represents the amplitude of the sound wave ? (b) Which letter represents the wavelength of the wave ? (c) What is the frequency of the source of sound if the vibrating source sound makes 360 oscillations in 2 minutes ? (d) Calculate the time period of the source of sound.

24. (a) Draw the schematic diagram of nitrogen cycle in nature. (b) Explain how the nitrogen molecules are converted into nitrates and nitrites by (i) Biological Process (ii) Physical process .

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SECTION - B 25. Along which of the following four directions OA, OB, OC and OD a narrow tube be placed so that the ticking of a clock placed at P is heard the loudest after being reflected from the reflecting surface.

1 (a) OA (b) OB (c) OC (d) OD

26. Suppose you have following material available in your school laboratory : 1 (A) An intense pointed source of sound (B) An intense and broad source of sound (C) A sharp pointed sound detector (D) A well polished metallic sheet (E) Two thin hollow card board tubes (F) A thick thermocol sheet You can perform the experiment on verifying the laws of reflection of sound successfully without using: (a) A and F (b) B and D (c) B and E (d) only B 27. The level of water in a measuring cylinder before and after a solid of mass 4g is fully immersed into it is as shown in the diagram. The density of the solid is : 1

(a) 4g cm3

(b) 3g cm3

(c) 2g cm3

(d) 1g cm3

28. Spring balance shown in the figure was used by a student to determine the weight of a given cube. The correct weight of the cube must be : 1

(a) 30.0 gwt

(b) 29.7 gwt

(c) 28.5 gwt

(d) 27.0 gwt

29. A student records the weight of a metallic cylinder first in air, then in fresh water and finally in a highly concentrated common salt solution in water of the respective readings of the weights are W1, W2 and W3 then the correct relationship in these three weights must be : 1 (a) W3 > W2 > W1 (b) W1 = W2 > W3 (c) W1 > W2 > W3 (d) W1 = W2 = W3

30. A given metallic solid is first weighed in air. It is then weight in by immersing is fully in each of the four vessels containing same liquid. If the volumes of liquids filled in the vessels are 400 mL, 500 mL, 800 mL and 1000 mL respectively then he must observe that the weight of the solid is : 1 (a) least when immersed in the vessel containing 1000 mL liquid (b) maximum when immersed in the vessel containing 1000 mL liquid (c) least when immersed in the vessel containing 400 mL liquid (d) Same in all the four cases 31. To observe and compare the pressure exerted by the three faces of a cuboid on the sand, if you have cuboids of same dimensions but of different materials, the best choice of material out of the following would be: 1 (a) Iron cuboid and fine sand (b) Aluminum cuboid and fine sand (c) Iron cuboid and coarse sand (d) Wooden cuboid and coarse sand 32. A cuboid of mass 2.0 kg and dimensions 2 cm X 5 cm X 25 cm is placed on a table to exert pressure on its surface. If the value of g=10m/s2 the maximum and minimum pressures exerted by the cuboid respectively are: (a) 20000 Pa ; 16000 Pa (b) 20000 Pa, 1600 Pa (c) 4000 Pa ; 1600 Pa (d) 4000 Pa, 2000 Pa 1 33. A strong transverse pulse created at one end of a string is observed to complete 5 up and down journeys along its length before fading out. The length of the string is 8 m and the pulse take 20 seconds to complete these journeys. The speed of the pulse through the string is: 1 (a) 16 m/s (b) 8 m/s (c) 4 m/s (d) 2 m/s 34. A longitudinal pulse is created in a slinky by a group of four students. They observed that the pulse returned at the point of creation 6 times in 15 s. If the slinky is stretched to 5 m, the speed of the pulse along the slinky is: 1 (a) 0.8 m/s (b) 1.6 m/s (c) 3.2 m/s (d) 4.0 m/s 35. Reena has observed leaf and stem like structures in the given specimen of a plant. The specimen she has observed is : 1

(a) fern

(b) spirogyra

(c) mushroom

36. Which among the following is the correct identification of the given two plants ?

(a) A is thallophyte and B is pteridophyte (b) A is pteridophyte and B is thallophyte (c) both A and B are pteridophyte (d) both A and B are thallophyte

(d) funaria 1

37. In the diagram given below, prominent and identifying features of a bony fish are labeled as A,B, C, D and E. Correct identification of A,B,C,D and E is : 1

(a) A-dorsal fin B—pectoral fin C-operculum D-pelvic fin E-anal fin (b) A-dorsal fin B-pelvic fin C-pectoral fin D-Anal fin E-operculum (c) A-operculum B-pectoral fin C-dorsal fin D-pelvic fin E-anal fin (d) A-operculum B- pelvic fin C-anal fin D-pectoral fin E-dorsal fin 38. In the diagram of the earthworm shown, the position of the mouth is indicated by :

(a) I

(b) III

(c) II

1

(d) IV

39. For the verification of the law of conservation of mass in a chemical reaction, four students A,B,C and D performed the following reactions.

1 A : Added lime stone to dil. hydrochloric acid.

B : Heated lead nitrate (Solid) in a text tube .

C : Dipped Mg ribbon in Copper sulphate solution.

D : Added copper sulphate solution to sodium carbonate solution.

The Student who is likely to obtain the best result is: (a) A (b) B (c) C (d) D 40. A reaction between barium chloride and sodium sulphate was carried out is a sealed conical flask. The masses of the reactants and the products were measured carefully. After the experiment it was concluded that (a) Mass of barium chloride = Mass of sodium chloride (b) Mass of sodium sulphate = Mass of barium sulphate (c) Mass of (barium chloride + Sodium sulphate) (d) Mass of (barium chloride + Sodium chloride) = Mass of (barium Sulphate + sodium Sulphate)

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41. Select the correct observations of leaves and seeds of pea plants as reported by four different students. (a) Reticulated venation in leaves and dicotyledonous seeds (b) Reticulated venation in leaves and monocotyledonous seeds (c) Parallel venation in leaves and dicotyledonous seeds (d) Parallel venation in leaves and monocotyledonous seeds 1 42. A student observed the developmental stages in the life cycle of a mosquito. He would have observed that the stage in which the organism is found in water only is : 1 (a) Egg (b) Larva (c) Pupa (d) Adult

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