Air and Atmosphere
Exhaled air contains 16% oxygen and about 4% of carbon dioxide, the rest of 80% is
neon
argon
nitrogen
none of them
nitrogen
Related posts
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
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
Leave a Reply