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




Q1

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

[A]. Automobile Exhaust
[B]. Burning of firewood
[C]. Windmill
[D]. Power plant
Q2

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.
Q3

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
Q4

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.
Q5

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

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




Q6

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
Q7

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.
Q8

Incomplete combustion of fuel such as petrol and diesel give:

[A]. Nitrogen Oxide
[B]. Sulphur dioxide
[C]. Carbon mono-oxide
[D]. Carbon dioxide
Q9

The phenomenon of “marble cancer” is due to:

[A]. Soot particles
[B]. CFCs
[C]. Log
[D]. Acid rain
Q10

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

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




Q11

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
Q12

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.
Q13

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
Q14

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

[A]. Nitrogen
[B]. Sulphur dioxide
[C]. Oxygen
[D]. Argon
Q15

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.



Q16

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.
Q17

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
Q18

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
Q19

Drinking water can be made absolutely safe by adding some:

[A]. Aspirin Tablets
[B]. Iodine Tablets
[C]. Chlorine Tablets
[D]. Chlorophyll Tablets
Q20

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



Q21

Which of the following is usually not a water pollutant?

[A]. Sewage
[B]. Fertilisers
[C]. Fly ash
[D]. Pesticide
Q22

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
Q23

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.
Q24

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

[A]. CFCs
[B]. Nitrogen Oxides
[C]. Dust
[D]. Carbon monoxide
Q25

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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