Class 8 Science Chapter 18 MCQ

Class 8 Science Chapter 18 MCQ (Multiple Choice Questions) of Pollution of Air and Water updated for academic session 2021-2022. All the answers are taken from latest NCERT Books released for CBSE Session 2021-2022.

These MCQ objective questions of chapter 18 class 8 science covers all the topics given in NCERT textbook and these are helpful for the preparation of school exams as well as unit tests.

Class 8 Science Chapter 18 MCQ for 2021-2022

Class: 8Science
Chapter: 18Pollution of Air and Water
Contents: MCQ Online Test with Answers

MCQ Tests with Answers for Class 8 Science Chapter 18


Which of the following is not a source of air pollution?

[A]. Automobile Exhaust
[B]. Burning of firewood
[C]. Windmill
[D]. Power plant

Read the following sentences carefully, and choose the correct one:

[A]. Forest fires and volcanic eruption are the two natural sources of air pollution which put smoke and dust into the air.
[B]. Air pollution produces a large number of a bad effects on living and nonliving things.
[C]. Sulphur dioxide is produced by the burning of coal in factories and thermal power plants.
[D]. All the above.

The phenomenon of “marble cancer” is due to:

[A]. Soot particles
[B]. CFCs
[C]. Log
[D]. Acid rain

Ravi is doing his homework which is given by his teacher. Would you help him to choose the incorrect sentences?

[A]. Smoke attracts our lungs and causes respiratory diseases.
[B]. Dust produces an allergic reaction in human body and aggravates disease like bronchitis.
[C]. Ultraviolet radiation can cause skin cancer, cataract and destruction of plants including crops.
[D]. None of the above.


Trees help in reducing the pollution of our environment. Lakhs of trees are planted by people in the month of July every year. This occasion is called:

[A]. Forest Conservation Day
[B]. Plantation month
[C]. Van Mahotsav
[D]. Wildlife

Vanya is writing some statements but she confused to know whether the statements are correct or not? If you know the answer to this question, then tell her:

[A]. Acid rain is that rain which contains small amount of acid formed from acidic gases like sulphur dioxide and nitrogen oxides present in polluted air.
[B]. Acid rain also damages a lot of crop plants every year and cause a big loss to the farmers and aquatic animals.
[C]. Acids present in acid reacts with the carbonates present in marble and limestone of a statue, building or monument and corrode it slowly.
[D]. All the above.


Which of the following will be reduced in air in city forest when a lot of dust and fly ash in emitted by a coal-based factory in the vicinity?

[A]. Nitrogen
[B]. Carbon dioxide
[C]. Oxygen
[D]. Water vapour

The excessive use of one of the following in agriculture can cause the death of fish in a pond by oxygen starvation. This one is:

[A]. Fertilizers
[B]. Manures
[C]. Pesticides
[D]. Herbicides

Arvind is doing his homework which is given by his teacher. Would you help him to choose the correct sentences?

[A]. Chlorination is commonly used chemical method for purifying water.
[B]. Water can be made absolutely safe for drinking by boiling.
[C]. A popular household water filter is a candle type water filter.
[D]. All the above.

Which of the following are used in electric water filters to kill all the harmful microorganisms present in the tap water and make it absolutely safe for drinking?

[A]. Infrared Radiation
[B]. Gamma Radiation
[C]. Visible Radiation
[D]. Ultraviolet Radiation

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