GENERAL SCIENCE #40
MULTIPLE CHOICE QUESTIONS
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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