Air and AtmosphereEveryday Science
Which of the following gas is more in percentage in the air?
Oxygen
Argon
Carbon dioxide
Nitrogen
Nitrogen
Out of all the gases present in the air, nitrogen constitutes highest percentage of i.e. 78%.
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B. water
C. ethers
D. phenols
There is no boundary between atmosphere and space, so the density of atmosphere decreases with
A. 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
The density of air in the atmosphere is
A. uniform
B. not uniform
C. zero
D. none of above
In the body, the weight of blood is about
A. 1/12th of body
B. 1/5th of body
C. 1/8th of body
D. 1/4th of body
Which substance is present in fuel?
A. Iron
B. Gold
C. Carbon
D. Copper
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