Percentage of carbon dioxide content in the atmosphere.
0.05
0.01
0.02
0.04
Photochemical smog is formed due to the release of which toxic gas?
Nitrogen dioxide
Carbon monoxide
Sulphur dioxide
Carbon dioxide
How much percentage of nitrogen present in the atmosphere is unreactive?
73
78
75
76
Which of the following statements is true?
Since the gases in the air posses different melting point, they can be separated using the fractional distillation method .
Since the gases in the air posses different freezing point, they can be separated using the fractional distillation method .
Since the gases in the air posses different boiling point, they can be separated using the fractional distillation method .
Since the gases in the air posses different density, they can be separated using the fractional distillation method .
Which of the following does the nitrogen fixation from the atmosphere in some plants ?
Earthworm
Termites
Creatures
Bacteria
Which type of water is made drinkable by desalination?
River
Well
Lake
Sea
Which of the following is caused by gases in the air, chiefly carbon dioxide and methane?
Photochemical smog
Acid rain
Global warming
Denitrification
Burning of petrol containing which of the following releases this toxic metal into the environment and can cause serious health hazards?
Chromium
Tin
Lead
Selenium
During the process of photosynthesis , plants use energy from the:
Atmosphere
Sun
Fossils
Earth's crust
Which of the following oxides are released from industry and which dissolve in rain water to produce 'acidrain'.
Nitrogen and Sulfur
Nitrogen and Silicon
Nitrogen and Phosphorous
Nitrogen and Selenium
