‘Ozone-hole’ means

  1. a large sized hole in the ozone layer
  2. thinning of the ozone layer
  3. small holes scattered in the ozone layer
  4. thickening of ozone in the ozone layer
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Which of the following is not a green house gas?

  1. nitrogen gas
  2. water vapour
  3. methane gas
  4. carbon dioxide
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The two forms of oxygen found in the atmosphere are

  1. water and ozone
  2. water and oxygen
  3. ozone and oxygen
  4. water and carbon-dioxide
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If there were no atmosphere around the earth, the temperature of the earth will

  1. increase
  2. go on decreasing
  3. increase during day and decrease during night
  4. be unaffected
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The atmosphere of the earth is heated by radiations which are mainly

  1. radiated by the sun
  2. re-radiated by land
  3. re-radiated by water
  4. re-radiated by land and water
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Incomplete combustion of fuel such as petrol and diesel gives

  1. nitrogen oxide
  2. sulphur dioxide
  3. carbon monoxide
  4. carbon dioxide
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Which of the following components of air is present in the largest amount in the atmosphere?

  1. Nitrogen
  2. Oxygen
  3. Water vapour
  4. Carbon dioxide
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Mountaineers carry oxygen cylinders with them because

  1. there is no oxygen on high mountains.
  2. there is deficiency of oxygen on mountains at high altitude.
  3. oxygen is used for cooking.
  4. oxygen keeps them warm at low temperature.
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