Atmosphere (Composition, Layers) NDA Questions

NDA Physical Geography

Atmosphere (Composition, Layers) MCQ Questions


1.
Which gas constitutes the major portion (by volume) of the Earth's atmosphere?
A.
Carbon dioxide
B.
Nitrogen
C.
Argon
D.
Oxygen
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ANSWER :
B. Nitrogen
2.
Approximately what percentage of the atmosphere's total mass is confined to the lowest 32 km from the Earth's surface?
A.
99 per cent
B.
75 per cent
C.
50 per cent
D.
90 per cent
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ANSWER :
A. 99 per cent
3.
At what height above the Earth's surface does oxygen become almost negligible in quantity?
A.
90 km
B.
150 km
C.
120 km
D.
100 km
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ANSWER :
C. 120 km
4.
Carbon dioxide and water vapour are found only up to what height from the Earth's surface?
A.
90 km
B.
32 km
C.
50 km
D.
120 km
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ANSWER :
A. 90 km
5.
Which gas is described as being 'transparent to incoming solar radiation but opaque to outgoing terrestrial radiation'?
A.
Helium
B.
Oxygen
C.
Carbon dioxide
D.
Nitrogen
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ANSWER :
C. Carbon dioxide
6.
Carbon dioxide is largely responsible for which of the following atmospheric phenomena?
A.
Ionisation of particles
B.
Ozone depletion
C.
Green house effect
D.
Formation of clouds
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ANSWER :
C. Green house effect