Class VIII

Chlorofluorocarbon is used in
  1. Refrigerators
  2. Air conditioners
  3. Perfumes
  4. All
Which of the following method is used to purify water?
  1. Chlorination
  2. Boiling
  3. Candle filter
  4. All of the above
Greenhouse effect is 
  1. Trapping of sun radiations by earths atmosphere
  2. Growing plants in a nursery
  3. Rise in carbondioxide in atmosphere
  4. None of these
Green House gas is
  1. Nitrogen
  2. Oxygen
  3. Methane
  4. Carbon dioxide
The substances which contaminate the air is called ____?
  1. Air pollution
  2. Air pressure
  3. Air Pollutants
  4. All of the above
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