Class VIII

What causes pollution
  1. Human activities
  2. Trees
  3. Both of these
  4. None of these
Highest percentage of air consists of
  1. Oxygen
  2. Carbon dioxide
  3. Nitrogen
  4. Argon
Chlorofluorocarbon is used in
  1. Refrigerators
  2. Air conditioners
  3. Perfumes
  4. All
Air pollution causes
  1. Global warming
  2. Respiratory problems
  3. Soil erosion
  4. None of these
Green House gas is
  1. Nitrogen
  2. Oxygen
  3. Methane
  4. Carbon dioxide
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