Class 8 Science Chapter 18 MCQ (Multiple Choice Questions) of Pollution of Air and Water updated for academic session 2023-2024. All the answers are taken from latest NCERT Books released for CBSE Session 2023-2024. 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 2023-2024

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

MCQ Tests with Answers for Class 8 Science Chapter 18


Air is a mixture of various gases. One of the gas is 21% part of the air and is essential for the survival of human beings. This gas is:

[A]. Nitrogen
[B]. Oxygen
[C]. Ozone
[D]. Argon

Which of the following statement is or are correct?

[A]. Pollution is unusually high concentration of harmful or poisonous substances in the environment.
[B]. An unwanted and harmful substances that contaminates the environment is called a pollutant
[C]. The mixture of gases containing nitrogen, oxygen, carbon dioxide, argon and water vapor gives us pure air which is good for us.
[D]. All the above.

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.

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

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

Potable water is the water which is:

[A]. Obtained from a river
[B]. Obtained from a lake
[C]. Pure and fit for drinking
[D]. Used only for washing clothes

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.

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

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

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 is not a “Greenhouse gas”?

[A]. Nitrogen gas
[B]. Water vapor
[C]. Methane gas
[D]. Carbon dioxide

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.

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

Supriya is writing some statements, choose the correct statement and help her:

[A]. The air pollution from motor vehicles can be reduced by using CNG.
[B]. We should use bicycle for covering short distances.
[C]. We should use limited fertilizers in agriculture purposes.
[D]. All the above.

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

Which of the following statement about ozone is correct?

[A]. It is essential for breathing
[B]. It absorbs ultraviolet rays
[C]. Its proportion in air is about 3%
[D]. It is mainly responsible for global warming

Drinking water can be made absolutely safe by adding some:

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

Which of the following is usually not a water pollutant?

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

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

One of the following does not contribute in producing acid rain. This one is:

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

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

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Last Edited: January 27, 2022