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.

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

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.

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

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

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 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 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

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

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

In the last year Class VIII examination, Ankit was asked a question where he had to choose the statement which was/were incorrect? Will you be able to answer this question?

[A]. Carbon dioxide, Methane, Nitrous oxide, Chlorofluorocarbons and Water vapors, are all greenhouse gases.
[B]. Discharging of untreated industrial waste into river and lakes causes water pollution.
[C]. Smoke emitted by factories and thermal power plants due to burning of coal cause air pollution.
[D]. None of the above.

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