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

Consider the following statements and choose the correct one:

[A]. Oil refineries and industries engaged in the production of metals and manufacture of chemicals cause air pollution.
[B]. Stone crushers, cement factories, asbestos factories and lead processing units cause air pollution.
[C]. Use of chlorofluorocarbons in refrigeration, air conditioning and aerosol sprays causes air pollution.
[D]. All the above.

Arun wishes to contribute in reducing air pollution. Which vehicle should he is used for going to school?

[A]. Car
[B]. School bus
[C]. Autorickshaw
[D]. Scooter

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.

Which of the following is not a way to conserve water?

[A]. Replace
[B]. Reduce
[C]. Reuse
[D]. Recycle


The type of pollution which is likely to affect “Taj Mahal in Agra” to a greater extent is

[A]. Air pollution
[B]. Water pollution
[C]. Soil pollution
[D]. Noise pollution

Recently, in a science class test, you are asked a question where you have to say whether the statements are correct or not?

[A]. Smoke is a deadly air pollutant which is formed by the combination of smoke and fog.
[B]. Carbon monoxide combines with the haemoglobin of our blood and reduces the oxygen carrying capacity of blood.
[C]. Carbon dioxide is a normal constituent of air but excess of carbon dioxide in air is considered a pollutant.
[D]. None of the above.

Incomplete combustion of fuel such as petrol and diesel give:

[A]. Nitrogen Oxide
[B]. Sulphur dioxide
[C]. Carbon mono-oxide
[D]. Carbon dioxide

The phenomenon of “marble cancer” is due to:

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

Which of the following procedures will give you water free from all impurities?

[A]. Adding chlorine tablets
[B]. Distillation
[C]. Boiling
[D]. Filtration


A pond contains clean water. Which of the following activities will produce least pollution of water?

[A]. Washing clothes in the pond
[B]. Bathing animals in the pond
[C]. Washing motor vehicles in the pond
[D]. Swimming in the pond

Shyam appeared in class test but he confused to know the correct statement. Would you help him to know that?

[A]. The minute ash particles formed by the burning of coal and carried into air by the gases produced during burning, is called fly ash.
[B]. Fly ash particles present in air cause irritation to the eyes, skin, nose, throat and respiratory tract.
[C]. The two extremely harmful effects of air pollution on the environment are acid rain and greenhouse effect.
[D]. All the above.

Which of the following air pollutant reduces the oxygen carrying capacity of blood to a large extent?

[A]. Carbon dioxide
[B]. Nitrogen monoxide
[C]. Carbon monoxide
[D]. Sulphur dioxide

The constituent of a polluted air which contributes in producing acid rain is:

[A]. Nitrogen
[B]. Sulphur dioxide
[C]. Oxygen
[D]. Argon

Which of the following statement is or are correct?

[A]. The slow corrosion of marble of a monument by acid rain is also known as “marble cancer”.
[B]. The greenhouse is a structure made of glass walls and glass roof in which the plants that need protection from cold weather are grown.
[C]. Due to the rapid burning of fossil fuels and decrease in forest, the amount of carbon dioxide gas in the atmosphere is increasing steadily.
[D]. All the above.


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

[A]. We should save trees and electricity.
[B]. We should join “Say No to Crackers” campaign.
[C]. We should not burn dry leaves, papers and garbage in an open-areas.
[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

Which of the following disease cannot be caused by drinking of river water contaminated with untreated sewage?

[A]. Cholera
[B]. Typhoid
[C]. Tuberculosis
[D]. Diarrhoea

Drinking water can be made absolutely safe by adding some:

[A]. Aspirin Tablets
[B]. Iodine Tablets
[C]. Chlorine Tablets
[D]. Chlorophyll Tablets

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


Which of the following is usually not a water pollutant?

[A]. Sewage
[B]. Fertilisers
[C]. Fly ash
[D]. Pesticide

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

Consider the following statements and choose the incorrect one:

[A]. Global warming can cause sea levels to rise dramatically.
[B]. Global warming can reduce rainfall in some areas of the earth leading to droughts.
[C]. Global warming is a serious threat to the existence of life on earth.
[D]. None of the above.

Which of the following air pollutant is capable of preventing photosynthesis in plants?

[A]. CFCs
[B]. Nitrogen Oxides
[C]. Dust
[D]. Carbon monoxide

Which of the following will reach the earth in “Greater amounts” if the amount of chlorofluorocarbons released into the air increases?

[A]. Infrared rays
[B]. X-rays
[C]. Gamma rays
[D]. Ultraviolet rays

Download App for Class 8


Help and Support

If you are facing any problem to access the contents of Tiwari Academy, please contact us for help. We are here to help you without any disturbance. All the contents on Tiwari Academy are free to use without any login. Feel free to contact us in case of any educational help.