Air and Atmosphere
The percentage composition of oxygen in air is
21%
31%
41%
51%
21%
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There is no boundary between atmosphere and space, so the density of atmosphere decreases withA. same height
B. increasing altitude
C. constant height
D. decreasing height
In fish, respiration takes place through
A. gills
B. lungs
C. throat
D. tail
Ammonia is used to make compounds such as
A. ammonium sulfate
B. ammonium nitrate
C. all of these
D. nitric acid
Intake of carbon dioxide and giving out of oxygen is the only process named
A. photosynthesis
B. respiration
C. rusting
D. excretion
Nitrogen is obtained from the fractional distillation of liquefied air at about
A. 196ยฐC
B. 186ยฐC
C. 176ยฐC
D. 166ยฐC
Oxygen is used in the manufacture of
A. glass
B. medicine
C. metal
D. chemical
The condensation point of oxygen gas is
A. (-113ยฐC)
B. (-133ยฐC)
C. (-183ยฐC)
D. (-143ยฐC)
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