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 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.
Q2

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

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

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.




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

The phenomenon of “marble cancer” is due to:

[A]. Soot particles
[B]. CFCs
[C]. Log
[D]. Acid rain
Q9

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.
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

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
Q13

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.
Q14

Which of the following is not a “Greenhouse gas”?

[A]. Nitrogen gas
[B]. Water vapor
[C]. Methane gas
[D]. Carbon dioxide
Q15

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.



Q16

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
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

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
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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