CBSE Class 8 Science Pollution of Air and Water Quiz 2

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

A Heavy metal ions B Sodium ions C Potassium ions D Chloride ions

2. Water containing high salt concentration can be purified by

A boiling B UV irradiation C filtration D reverse osmosis

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

A Sulphur dioxide B DDT C Nitrogen oxide D Hydrogen oxide

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

A Industrial wastes B Untreated sewage C Use of fertilisers D Toxic metals

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

A Water wheel B Canal irrigation C Drip irrigation D 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