CBSE Class 8 Science Worksheet - Pollution of Air and Water Part B

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CBSE Class 8 Science Worksheet - Pollution of Air and Water Part B - Practice worksheets for CBSE students. Prepared by teachers of the best CBSE schools in India.


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Assignment No. 10

Q.1 Fill in the blanks:-

(i) By volume about _______ of air is nitrogen and about _________ is oxygen.

(ii) Incomplete burning of fuels produces ________ which is a _______ gas.

(iii) Carbon monoxide _________ the oxygen carrying capacity of the blood.

(iv) Petroleum refineries are a major source of gaseous pollutants like ______ and ______.

(v) _______ used in refrigerators damages the ozone layer of the atmosphere.

(vi) Ozone layer protects us from the harmful ________ rays of the sun.

(vii) _______ of the world’s population is without safe drinking water.

(viii) We can save water by remembering the 3R’s ____, ____ and ________.

(ix) Acid rain is formed by the oxidation followed by dissolution of ________ and gases in rain water.

Q.2 MULTIPLE CHOISE QUESTIONS: (Choose the most appropriate answer.?

(A) Which of these causes water pollution?

  (a) Sewage (b) Industrial waste (c) Fertilizers and pesticides (d) All of these

(B) Which of these processes can not remove germs from water?

  (a) boiling (b) Filtration through Porous Pot (c) Reverse Osmosis (d) exposure to UV light

(C) Which of the following is not a pollutant unless present in excess?

  (a) Sulpher Dioxide (b) Carbon dioxide (c) Nitrogen dioxide (d) carbon monoxide

(D) Which of these can cause acid rain?

  (a) Sulpher Dioxide (b) Carbon dioxide (c) Nitrogen (d) carbon monoxide

Q.3 Define air pollution. What are air pollutants?

Q.4 What are the various sources of air pollutants?

Q.5 What is smog? Why is it harmful?

Q.6 What is acid rain?

Q.7 How is the Taj Mahal affected by air pollution?

Q.8 What is meant by ‘Marble Cancer’?

Q.9 Write the full forms (i) CFC (ii) CNG (iii) LPG (iv) WWF

Q.10 What is greenhouse effect? Name four greenhouse gases.

Q.11 Write a note on global warming mentioning its effects too.

Students must free download and practice these worksheets to gain more marks in exams. CBSE Class 8 Science Worksheet - Pollution of Air and Water Part B


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