CBSE  /  Class 8  /  Science  /  Pollution of Air and Water

  • 1. 
    Which of the following contents is most harmful to aquatic animals?

  • Heavy metal ions
  • Sodium ions
  • Potassium ions
  • Chloride ions

  • 2. 
    Water containing high salt concentration can be purified by

  • boiling
  • UV irradiation
  • filtration
  • reverse osmosis

  • 3. 
    Which of the following is a non-biodegradable pollutant?

  • Sulphur dioxide
  • DDT
  • Nitrogen oxide
  • Hydrogen oxide

  • 4. 
    Which of the following is major source of water pollution?

  • Industrial wastes
  • Untreated sewage
  • Use of fertilisers
  • Toxic metals

  • 5. 
    Which of the following techniques of irrigation should be used to save water?

  • Water wheel
  • Canal irrigation
  • Drip irrigation
  • Lift irrigation

  • 6. 
    Carbon monoxide in vehicle exhaust causes

  • 7. 
    Smog =

  • 8. 
    The gas used in refrigerating appliance causing serious damage to ozone is

  • 9. 
    Acid rain mainly contains

  • 10. 
    Marble cancer is caused by

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