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Very Short Answers - Pollution of Air and Water, Science, Class 8 - Notes | Study Science Class 8 - Class 8

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VERY SHORT ANSWER TYPE QUESTIONS
 

Q. 1. What is the percentage of nitrogen in atmosphere?
Ans.
78%


Q. 2. What is the percentage of oxygen in atmosphere?
Ans.
21%


Q. 3. Which problem arises by air pollution?
Ans.
Respiratory problem


Q. 4. What is smog?
Ans.
A thick fog-like layer in the atmosphere is called smog.
 

Q. 5. Which gases are responsible for acid rain?
Ans.
Sulphur dioxide and nitrogen dioxide.
 

Q. 6. Which gas is responsible for greenhouse effect?
Ans.
CO2 (carbon dioxide)


Q. 7. What is global warming?
Ans.
Increasing temperature in atmosphere is called global warming.
 

Q. 8. Which phenomenon causes global warming?
Ans.
Greenhouse effect


Q. 9. What is air pollution?
Ans.
Addition of pollution in air is called air pollution.
 

Q . 10. Which gas is responsible for depletion of ozone layer?
Ans.
Chlorofluorocarbons (CFCs)
 

Q . 11. Which fuel are pollution free?
Ans.
CNG and LPG


Q . 12. What pollutes Ganga?
Ans.
Untreated sewage, dead bodies, garbage, etc.
 

Q . 13. What do you mean by potable water?
Ans.
Water which is suitable for drinking is called potable water.
 

Q . 14. Which chemical is used to purify water?
Ans.
Chlorine


Q . 15. What radiation is absorbed by CO2?
Ans.
Infrared radiation


Q . 16. Which rays are harmful for us?
Ans
. Ultraviolet rays


Q . 17. Which gas is called greenhouse gas?
Ans.
CO2, Methane


Q . 18. What are alternative renewable fuels?
Ans.
Solar energy, hydropower and wind energy


Q. 19. What do you mean by ‘Van Mahotsav’?
Ans.
When lakhs of trees are planted in July every year, this is called Van Mahotsav.
 

Q . 20. When was Ganga Action Plan launched?
Ans.
In 1985


Q . 21. Name one of the poisonous elements present in the exhaust of automobiles.
Ans.
Lead.

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