Properties of Air and Water NDA Questions

NDA Chemistry

Properties of Air and Water MCQ Questions


7.
Which gas is present in the highest percentage (about 78%) in the atmospheric air?
A.
Carbon dioxide
B.
Argon
C.
Oxygen
D.
Nitrogen
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ANSWER :
D. Nitrogen
8.
Approximately what percentage of atmospheric air is made up of oxygen?
A.
About 0.03%
B.
About 78%
C.
About 50%
D.
About 21%
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ANSWER :
D. About 21%
9.
Besides nitrogen and oxygen, air also contains small amounts of which of the following gases?
A.
Only helium
B.
Carbon dioxide, water vapour and other gases like argon
C.
Only hydrogen
D.
Only chlorine
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ANSWER :
B. Carbon dioxide, water vapour and other gases like argon
10.
Apart from various gases, atmospheric air also contains tiny solid particles such as:
A.
Dust, smoke and pollen grains
B.
Only ice crystals
C.
Only salt crystals
D.
Only water droplets
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ANSWER :
A. Dust, smoke and pollen grains
11.
The gas required by living organisms for the process of respiration (breathing) is mainly:
A.
Argon
B.
Carbon dioxide
C.
Oxygen
D.
Nitrogen
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ANSWER :
C. Oxygen
12.
The gas that plants use, along with water and sunlight, to prepare their food during photosynthesis is:
A.
Nitrogen
B.
Hydrogen
C.
Oxygen
D.
Carbon dioxide
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ANSWER :
D. Carbon dioxide