psc_science_englishv-7

3. Write down the short answer of the following questions in answer script: 110=10 a) What is called food chain? b) Write down the causes of soil pollution. c) Write the name of four elements of air. d) What is matter made of? e) What is optimum food? f) What is a galaxy? g) What are the names of input devices of a computer? h) How is low pressure created? i) What are the greenhouse gases? j) What do you understand by population?

4. Including a and b answer any 8 of the following questions: 58=40 a) Your friend’s father is suffering from cough and sometime coughing up blood) How would he recover from this disease? Write your opinion. b) Explain the effect of cyclones on our national life? c) Explain water cycle with figure. d) What are the differences between food chain and food web? e) What are the processes of transmission of heat? f) What is junk food? Explain. g) Explain with diagram the reasons for day and night. h) We cannot live without using technology explains. i) How does heat of the sun play a role in changing the weather? j) Write down the impacts of excess population of natural environment.

Primary Education completion Examination-2013 Model TestSubject: Elementary Science Time: 2 hours 30 minutes Full marks: 100 1) Write down the correct answer in answer script: 140=40 (1) Which is absorbed by plants from air for photosynthesis? a) Oxygen b) Nitrogen c) Carbon dioxide d) Chlorophyll (2) Which one is the main source of energy? a) Water b) Air c) Soil d) Sun (3) Which one is a pollutant of air? a) Pesticides b) Black smoke of mills and factories c) Wastes d) Open larine (4) Which one is essential for human life? a) Gas b) Water c) Soil d) Light (5) Where does water go by turn into water vapour? a) Into the pond b) Into the river c) Into the sea d) In the air (6) Which gas is used to produce urea fertilizer? a) Oxygen b) Carbon dioxide c) Nitrogen d) Water vapour (7) Which is the cause of acid rain? a) Carbon dioxide b) Sulphur dioxide c) Carbon monoxide d) Per oxide (8) In how many process can heat transmit? a) 3 b) 4 c) 6 d) 5 (9) What is present in junk food in high level? a) Protein b) Fat c) Carbohydrate d) Vitamin (10) Which one is used to make food attractive? a) Iodine b) Formalin c) Saccharine d) Artificial colour (11) Which disease is caused by streptococcus? a) Rheumatic fever b) Measles c) Pox d) Polio (12) Which experiment can be done by using a globe and a candle? a) Season change b) Experiment to show day ad night c) Tide d) Identify the time (13) Which one is the most used technology of the modern age? a) X-ray b) Computer c) Television d) Radio

(14) Which direction does the Kalboishakhi come from? a) From south-east direction b) From north-west direction c) From north-east direction d) From south-west direction (15) Which one meets the demand of our basic need? a) Soil, water, air b) Factories and vehicles c) Computer and television d) Guitar and violin (16) For which one of the following the animals depends upon the plants? a) Light b) Water c) Seed d) Food (17) Which one of the following causes air pollution? a) Use of pesticide b) Burning bricks in the brick fields c) Obstacle of rain water d) Use of chemical fertilizer (18) Which one is the natural cause of water pollution? a) Pollution by Arsenic b) Pollution by insecticide c) Pollution by industrial wastes d) Pollution by germs (19) Which gas used in the packet of chips? a) Oxygen b) Carbon dioxide c) Nitrogen d) Carbon monoxide (20) Which one of the following is junk food? a) Potato mesh b) Bread c) Potato chips d) Parata (21) Measles, pox etc) can spread througha) Water b) Air c) Mosquito d) Food (22) Which one is correct? a) Moon is a star b) Moon is a satellite c) Moon is a planet d) Moon is a meteor (23) Which one of the following is correct? a) There is no relation between science and technology b) Science and technology are the same c) Science and technology are related d) Science is not needed for technology (24) Which portable instrument should be used to store information in a small space? a) DVD b) Pen drive c) CD d) Laptop (25) What does air temperature mean? a) How much hot or cold b) More vapour or less vapour c) Whether air is dense or light d) More sunlight or less sunlight (26) Which one are renewable natural resources? a) Petroleum b) Water c) Natural gas d) Fossil fuel (27) The basic need of a infant isa) Mothers milk b) Dress c) Medical care d) Housing (28) Which is the element of abiotic environment? a) Hills b) Human c) Grass d) Dolphin

(29) What is the cause of soil pollution? a) Burning bricks in the brick fields b) Household wastes c) Plastic d) stagnant water (30) What colour is used to mark a tube well with Arsenic free water? a) Red b) Green c) Yellow d) Pink (31) Which is a poisonous gas? a) Oxygen b) Carbon dioxide c) Nitrogen d) Carbon monoxide (32) What is energy? a) Changes b) Agent of changes c) Transformer d) Balanced diet (33) What is created by mixing six food elements together? a) Carbohydrate b) Protein c) Fat d) Balanced diet (34) What is N1H1? a) A virus b) A bacteria c) A particle d) Infectious germ (35) How many satellites of earth? a) 1 b) 2 c) 3 d) 4 (36) Necessity is the mother of what? a) Science b) Technology c) Invention d) Information (37) How many major parts are there in a computer? a) 2 b) 3 c) 4 d) 5 (38) Water vapour isa) Heavier than air b) Lighter than air c) Warmer than air d) Solid (39) Which one is non-renewable resource? a) Solar energy b) Coal c) Wind flow d) Bio-fuel (40) Which one is natural resource? a) Glass b) Sand c) Spade d) Sickle 2. Fill in the blanks: 110=10 a) The increase of earth’s ________ is known as global warming. b) Climate is the overall condition of the ________ of place for many years. c) The aim of technology is to control _________. d) The moon has no _______ of its own. e) The pox virus can be spread through ________. f) In chill condition ________ cannot grow in food. g) We are surrounded by _________. h) The green plants produce ________ by the process of photosynthesis. i) The small animals are eaten by _________. j) Diarrhoea is a ________ disease.