Air and Atmosphere
There is no boundary between atmosphere and space, so the density of atmosphere decreases with
same height
increasing altitude
constant height
decreasing height
increasing altitude
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In fish, respiration takes place throughA. 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
The percentage composition of oxygen in air is
A. 21%
B. 31%
C. 41%
D. 51%
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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