Class VIII

Chlorofluorocarbon is used in
  1. Refrigerators
  2. Air conditioners
  3. Perfumes
  4. All
CNG is a
  1. Polluted fuel
  2. Clean fuel
  3. Harmful fuel
  4. None
Highest percentage of air consists of
  1. Oxygen
  2. Carbon dioxide
  3. Nitrogen
  4. Argon
Most polluted river in the world is
  1. Yamuna
  2. Cavery
  3. Chenab
  4. Ganga
Air pollution causes
  1. Global warming
  2. Respiratory problems
  3. Soil erosion
  4. None of these
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LKG - 12th

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