Atmosphere (Composition, Layers) NDA Questions

NDA Physical Geography

Atmosphere (Composition, Layers) MCQ Questions


7.
The volume of carbon dioxide in the atmosphere has been rising over the past few decades mainly due to:
A.
Burning of fossil fuels
B.
Deforestation alone
C.
Industrial dust emissions
D.
Volcanic eruptions
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ANSWER :
A. Burning of fossil fuels
8.
Ozone is found in which layer/height range above the Earth's surface?
A.
Between 50 and 80 km
B.
Between 0 and 10 km
C.
Between 10 and 50 km
D.
Between 80 and 400 km
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ANSWER :
C. Between 10 and 50 km
9.
What is the primary function of the ozone layer in the atmosphere?
A.
It produces the colour of the sky
B.
It absorbs ultra-violet rays from the sun, preventing them from reaching the Earth's surface
C.
It traps terrestrial radiation to warm the Earth
D.
It reflects radio waves back to Earth
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ANSWER :
B. It absorbs ultra-violet rays from the sun, preventing them from reaching the Earth's surface
10.
Water vapour in the atmosphere generally:
A.
Is found only above 90 km
B.
Decreases with increasing altitude
C.
Increases with increasing altitude
D.
Remains constant at all altitudes
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ANSWER :
B. Decreases with increasing altitude
11.
In the warm and wet tropics, water vapour may account for approximately what percentage of the air by volume?
A.
25 per cent
B.
10 per cent
C.
1 per cent
D.
4 per cent
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ANSWER :
D. 4 per cent
12.
In dry and cold areas such as deserts and polar regions, water vapour may account for:
A.
About four per cent of the air
B.
About fifty per cent of the air
C.
Less than one per cent of the air
D.
About ten per cent of the air
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ANSWER :
C. Less than one per cent of the air