Class 8 Science Chapter 18 MCQ (Multiple Choice Questions) of Pollution of Air and Water updated for academic session 2022-2023. All the answers are taken from latest NCERT Books released for CBSE Session 2022-2023. 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 2022-2023

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.

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

In a science quiz competition, Nidhi is asked a question where she had to choose the statement which was/were incorrect?

[A]. Nitrogen oxides are produced by the burning of fuels like petrol and diesel in motor vehicles.
[B]. Nitrogen oxides attack breathing system and lead to lung congestion.
[C]. Sulphur Dioxide gas in the polluted air causes respiratory problems and also produces acid rain.
[D]. None of the above.

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

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

[A]. Chlorofluorocarbons are the chemical compounds made of chlorine fluorine and carbon elements.
[B]. Chlorosulphurcarbons are depleting the useful ozone layer of the upper atmosphere.
[C]. Ozone layer prevents the harmful ultraviolet radiation of the sun from reaching the earth.
[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

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 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

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.

The Kyoto Protocol is associated with one of the following. This one is:

[A]. Reduction in the use of chlorofluorocarbons
[B]. Reduction in the emission of greenhouse gases
[C]. Reduction in the cutting of the forest trees
[D]. Reduction in the pollution of fresh water sources

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 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

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 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

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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