General Science #40 Multiple Choice Questions (MCQ) : Assam Jobs Guide

GENERAL SCIENCE #40

MULTIPLE CHOICE QUESTIONS

General Science : Multiple Choice Questions (MCQ) : Assam Jobs Guide

1. The atmosphere of the Earth is heated by radiations which are mainly ……………

(a) radiated by the Sun

(b) re-radiated by land

(c) re-radiated by water

(d) re-radiated by land and water

Answer: (d)

2. If there were no atmosphere around the Earth, the temperature of the Earth will ……………

(a) increase

(b) go on decreasing

(c) increase during day and decrease during night

(d) be unaffected

Answer: (c)

3. What would happen, if all the oxygen present in the environment is converted to ozone?

(a) We will be protected more

(b) It will become poisonous and kill living forms

(c) Ozone is not stable, hence it will be toxic

(d) It will help harmful Sun radiations to reach Earth and damage many life forms

Answer: (b)

4. Which of the following factors does not lead to soil formation in nature?

(a) Sun

(b) Water

(c) Wind

(d) Polythene bags

Answer: (d)

5. The two forms of oxygen found in the atmosphere are ……………

(a) water and ozone

(b) water and oxygen

(c) ozone and oxygen

(d) water and carbon dioxide

Answer: (c)

6. The process of nitrogen-fixation by bacteria does not take place in the presence of ……………

(a) molecular form of hydrogen

(b) elemental form of oxygen

(c) water

(d) elemental form of nitrogen

Answer: (b)

7. Rainfall patterns depend on ……………

(a) the underground water table

(b) the number of water bodies in an area

(c) the density pattern of human population in an area

(d) the prevailing season in an area

Answer: (b)

8. Among the given options, which one is not correct for the use of large amount of fertilisers and pesticides?

(a) They are eco-friendly

(b) They turn the fields barren after some time

(c) They adversely affect the useful component from the soil

(d) They destroy the soil fertility

Answer: (a)

9. The nitrogen molecules present in air can be converted into nitrates and nitrites by ……………

(а) a biological process of nitrogen fixing bacteria present in soil

(b) a biological process of carbon fixing factor present in soil

(c) any of the industries manufacturing nitrogenous compounds

(d) the plants used as cereal crops in field

Answer: (a)

10. Which of the following processes is not a step involved in the water-cycle operating in nature?

(a) Evaporation

(b) Transpiration

(c) Precipitation

(d) Photosynthesis

Answer: (d)

11. Which of the following statements does not give the correct definition of the term ‘water pollution’?

(a) The addition of undesirable substances to water bodies

(b) The removal of desirable substances from water bodies

(c) A change in pressure of the water bodies

(d) A change in temperature of the water bodies

Answer: (c)

12. Which of the following is not a greenhouse gas?

(a) Methane

(b) Carbon dioxide

(c) Carbon monoxide

(d) Ammonia

Answer: (d)

13. Which step is not involved in the carbon-cycle?

(o) Photosynthesis

(b) Transpiration

(c) Respiration

(d) Burning of fossil fuels

Answer: (b)

14. ‘Ozone-hole’ means ……………

(a) a large sized hole in the ozone layer

(b) thinning of the ozone layer

(c) small holes scattered in the ozone layer

(d) thickening of ozone in the ozone layer

Answer: (b)

15. Ozone-layer is getting depleted because of ……………

(a) excessive use of automobiles

(b) excessive formation of industrial Units

(c) excessive use of man-made compounds containing both fluorine and chlorine

(d) excessive deforestation

Answer: (c)

16. Which of the following is a recently originated problem of environment?

(a) Ozone layer depletion

(b) Greenhouse effect

(c) Global warming

(d) All of the above

Answer: (d)

17. When we breathe in air, nitrogen also goes inside along with oxygen. What is the fate of this nitrogen?

(a) It moves along with oxygen into the cells

(b) It comes out with the CO2 during exhalation

(c) It is absorbed only by the nasal cells

(d) Nitrogen concentration is already more in the cells so it is not at all absorbed

Answer: (b)

18. Top-soil contains which of the following?

(а) Humus and living organisms only

(b) Humus and soil particles only

(c) Humus, living organisms and plants

(d) Humus, living organisms and soil particles

Answer: (d)

19. Choose the correct sequence.

(a) CO2 in atmosphere → decomposers → organic carbon in animals → organic carbon in plants

(b) CO2 in atmosphere → organic carbon in plants → organic carbon in animals → inorganic carbon in soil

(c) Inorganic carbonates in water organic carbon in plants → organic carbon in animals → scavengers

(d) Organic carbon in animals → decomposers → CO2 in atmosphere → organic carbon in plants

Answer: (b)

20. Major source of mineral in soil is the ……………

(a) parent rock from which soil is formed

(b) plants

(c) animals

(d) bacteria

Answer: (a)

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