Major part of the air is constituted by
  • nitrogen
  • oxygen
  • carbon dioxide
  • inert gases
Which of the following gas helps in burning? ,
  • Nitrogen
  • Oxygen
  • Carbon dioxide
  • Carbon monoxide
Which of the following gas we use in breathing?
  • Carbon dioxide
  • Nitrogen
  • Oxygen
  • None of these
Wind is
  • air around us
  • rising hot air
  • air in motion
  • none of these
Air is present in
  • atmosphere
  • soil
  • water of ponds, lakes and seas
  • everywhere
Air is
  • a mixture
  • a pure substance
  • an element
  • anything, that depends on the place where it is found
Envelope of air that surrounds the earth is known as
  • biosphere
  • atmosphere
  • environment
  • ecosystem
The ratio of nitrogen to oxygen in the air is
  • 1:4
  • 4:1
  • 3:1
  • 1:2
The main constituent of the air is.
  • nitrogen
  • oxygen
  • carbon dioxide
  • hydrogen
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