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NCERT Solutions for Class 8th Science


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Chapter 18. Pollution of Air and Water

Additional Questions With Solutions




Additional Questions With Solutions

Ques: Name the various components of air.

Ans: Nitrogen 78%, Oxygen 21%, carbon dioxide, argon, and methane.

Ques: What is air pollution?

Ans: the contamination of air by impurities like smoke and poisonous gases which may have a harmful impact on the living and the non-living components, this is called air pollution.

Ques: What is pollutant? Name two such pollutants which are responsible for air pollution.

Ans: The substances which contaminate the air and water. These are called pollutants. Carbon dioxide and carbon monoxide.   

Ques: Name the sources of air pollutants.

Ans: Factory, electric reactor, automobile vehicles, Fuels like coal and wood etc.

Ques: Name the element that is responsible for damaging of ozone layer.

Ans: Chlorofluro carbon (CFC).

Ques: What are the sources of Chlorofluro carbon (CFC)?

Ans: Chlorofluro carbon (CFC) are used in refrigerators, air conditioners and aerosole.

Ques: How is ozone layer useful for us?   

Ans: Ozone layer prevents us to the ultraviolet rays coming from the sun.

Ques: Why are the ultraviolet rays harmful for us?

Ans: Ultraviolet rays carry radiations Which harm our body and cause various diseases like cancer and skin disorders.

Ques: What is acid rain?

Ans: The sulphur dioxide and nitrogen form sulphuric acid nitric acid react with moisture and water vapour in atmosphere. This is called acid rain.



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