Class VIII

Green house gas is ?
  1. Carbon dioxide
  2. Methane
  3. Oxygen
  4. Helium
What causes pollution
  1. Human activities
  2. Trees
  3. Both of these
  4. None of these
Most polluted river in the world is ?
  1. Ganga
  2. Kaveri
  3. Yamuna
  4. Salem
Which process removes all the impurities from water ?
  1. Distillation
  2. Filtration
  3. Boiling
  4. Chlorine tablets
Air pollution causes
  1. Global warming
  2. Respiratory problems
  3. Soil erosion
  4. None of these
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