We have compiled the NCERT MCQ Questions for Class 8 Science Chapter 18 Pollution of Air and Water with Answers Pdf free download covering the entire syllabus. Practice MCQ Questions for Class 8 Science with Answers on a daily basis and score well in exams. Refer to the Pollution of Air and Water Class 8 MCQs Questions with Answers here along with a detailed explanation.
Pollution of Air and Water Class 8 MCQs Questions with Answers
Choose the correct option.
Question 1.
Which of the following is a major source of water pollution?
(a) Sulphur dioxide
(b) Nitrogen oxide
(c) DDT
(d) Hydrogen oxide
Answer
Answer: (c) DDT
Question 2.
The phenomenon of marble cancer is due to
(a) soil particles
(b) fog
(c) CFCs
(d) acid rain
Answer
Answer: (d) acid rain
Question 3.
Which gas is the major pollutant of air?
(a) Carbon monoxide
(b) Nitrogen
(c) Oxygen
(d) Propane
Answer
Answer: (a) Carbon monoxide
Question 4.
The solid or liquid particles dispersed in the air are called
(a) oxides
(b) acids
(c) hydrocarbons
(d) aerosols
Answer
Answer: (d) aerosols
Question 5.
Water containing high salt concentration can be purified by
(a) boiling
(b) UV radiation
(c) filtration
(d) reverse osmosis
Answer
Answer: (d) reverse osmosis
Question 6.
The Taj Mahal is being affected due to
(a) noise pollution
(b) air pollution
(c) water pollution
(d) soil pollution
Answer
Answer: (b) air pollution
Question 7.
Greenhouse gas is
(a) nitrogen
(b) methane
(c) carbon dioxide
(d) both (b) and (c)
Answer
Answer: (d) both (b) and (c)
Question 8.
Pollution of water is due to
(a) oil refineries
(b) paper factories
(c) sugar mills
(d) all of these
Answer
Answer: (d) all of these
Question 9.
The percentage of nitrogen is
(a) 21%
(b) 78%
(c) 12%
(d) 87%
Answer
Answer: (b) 78%
Question 10.
Chlorofluorocarbon is used in
(a) refrigerators
(b) air conditioners
(c) aerosol sprays
(d) all of these
Answer
Answer: (d) all of these
Question 11.
Which of the following is not a way to conserve water?
(a) Replace
(b) Reuse
(c) Reduce
(d) Recycle
Answer
Answer: (a) Replace
Question 12.
Water suitable for drinking is known as
(a) impure water
(b) pure water
(c) potable water
(d) safe water
Answer
Answer: (c) potable water
Question 13.
The contamination of natural environment is known as
(a) pollution
(b) greenhouse effect
(c) global warming
(d) CFCs
Answer
Answer: (a) pollution
Question 14.
Agents that pollute water, soil and air is known as
(a) pollutants
(b) waste
(c) effluent
(d) garbage
Answer
Answer: (a) pollutants
Question 15.
The amount of oxygen in the earth’s atmosphere is
(a) 78%
(b) 21%
(c) 0.01%
(d) 3%
Answer
Answer: (b) 21%
Question 16.
Which of the following is not a greenhouse gas?
(a) Nitroger.
(b) Methane
(c) Water vapour
(d) Carbon dioxide
Answer
Answer: (a) Nitroger.
Question 17.
The occasion of planting lakhs of trees in the month of July every year is known as
(a) Forest conservation day
(b) Plantation month
(c) Van mahotsav
(d) Wildlife week
Answer
Answer: (c) Van mahotsav
Question 18.
Which of the following procedures will give you water free from all impurities?
(a) Chlorine tablets
(b) Boiling
(c) Distillation
(d) Filtration
Answer
Answer: (c) Distillation
Question 19.
What percentage of nitrogen is present in the air?
(a) 78%
(b) 68%
(c) 58%
(d) 48%
Answer
Answer: (a) 78%
Question 20.
Which of these can cause acid rain?
(a) Carbon dioxide
(b) Carbon monoxide
(c) Sulphur dioxide
(d) Hydrogen
Answer
Answer: (c) Sulphur dioxide
Question 21.
Which of the following is a disease of respiratory system?
(a) Asthma
(b) Diarrhoea
(c) Cholera
(d) Jaundice
Answer
Answer: (a) Asthma
Question 22.
Eutrophication results in the deficiency of which gas in water?
(a) Hydrogen
(b) Nitrogen
(c) Carbon dioxide
(d) Oxygen
Answer
Answer: (d) Oxygen
Question 23.
Which substance is formed after reaction between CFCs and ozone?
(a) Oxygen
(b) Nitrogen
(c) Carbon dioxide
(d) Chlorine
Answer
Answer: (a) Oxygen
Question 24.
The Taj Mahal is being affected mainly by
(a) noise pollution
(b) air pollution
(c) water pollution
(d) none of these
Answer
Answer: (b) air pollution
Question 25.
The percentage of oxygen in the air is
(a) 21%
(b) 78%
(c) 12%
(d) 87%
Answer
Answer: (a) 21%
Question 26.
Pollution of water is caused by
(a) oil refineries
(b) paper factories
(c) sugar mills
(d) all of these
Answer
Answer: (d) all of these
Question 27.
Chlorofluorocarbon is used in
(a) refrigerators
(b) air conditioners
(c) perfumes
(d) all of these
Answer
Answer: (d) all of these
Question 28.
The most polluted river in the world is
(a) Yamuna
(b) Cauvery
(c) Chenab
(d) Ganga
Answer
Answer: (d) Ganga
Question 29.
Which of the following gases causes global warming?
(a) Nitrogen
(b) Methane
(c) Carbon dioxide
(d) Both (b) and (c)
Answer
Answer: (d) Both (b) and (c)
Fill in the Blanks
Question 1.
Water which is suitable for drinking is called ……………… water.
Answer
Answer: potable
Question 2.
……………… is one of the most famous rivers of India.
Answer
Answer: Ganga
Question 3.
……………… % of the world’s population is without safe drinking water.
Answer
Answer: 25
Question 4.
……………… % of nitrogen is present in earth’s atmosphere.
Answer
Answer: 78
Question 5.
……………… are those kind of pollutants which are used in air conditioners and refrigerators.
Answer
Answer: CFC’s
Question 6.
The ……………… present in the faeces of mammals are indicators of the quality of water.
Answer
Answer: bacteria
Question 7.
An odd combination of smoke and fog is called ………………
Answer
Answer: smog
Question 8.
The solid or liquid particles dispersed in air are called ………………
Answer
Answer: aerosols
Question 9.
Most of the atmospheric air is contained in the atmospheric layer called ………………
Answer
Answer: troposphere
Question 10.
Water is a ……………… natural resources.
Answer
Answer: precious
Question 11.
Cholera is a ……………… borne disease.
Answer
Answer: water
Question 12.
……………… is produced from incomplete burning of fuel.
Answer
Answer: Carbon monoxide
Question 13.
……………… kills the germs present in water.
Answer
Answer: Boiling
Question 14.
Increasing levels of ……………… gases are leading to global warming.
Answer
Answer: greenhouse
Question 15.
……………… corrodes the marble of monuments.
Answer
Answer: Acid rain
Question 16.
Gangotri glacier in the Himalayas has started melting because of …………………….
Answer
Answer: global warming
Question 17.
……………………. is a method of obtaining safe drinking water.
Answer
Answer: Chlorination
Question 18.
Pesticides and ……………………. seep into the ground to pollute ground water.
Answer
Answer: weedicides
Question 19.
……………………leads to an increase in the amount of CO2 in the atmosphere.
Answer
Answer: Deforestation
Question 20.
Particles of dust, cement and carbon particles in smoke may cause …………………….
Answer
Answer: bronchitis
Question 21.
Air contains ……………………. percent nitrogen.
Answer
Answer: 78
True or False
Question 1.
CFC’s are not used in refrigerators.
Answer
Answer: False
Question 2.
78% of oxygen is present in earth’s atmosphere.
Answer
Answer: False
Question 3.
Rapid growth of algae on the surface of water is known as algal bloom.
Answer
Answer: True
Question 4.
SO2, CO2 and nitrogen oxides are polluting gases.
Answer
Answer: True
Question 5.
Infrared radiations are absorbed by oxygen.
Answer
Answer: False
Question 6.
Acid rain does not affect the soil and plants.
Answer
Answer: False
Question 7.
Substances which contaminate the air are called water pollutants.
Answer
Answer: False
Question 8.
Smog causes breathing difficulties.
Answer
Answer: True
Question 9.
CFC’s damage the ozone layer of the atmosphere.
Answer
Answer: True
Question 10.
Water which looks clean still has dissolved impurities and disease causing microorganisms.
Answer
Answer: True
Question 11.
Corrosion of marble is known as marble cancer.
Answer
Answer: True
Question 12.
Global warming is a serious threat for life on earth.
Answer
Answer: True
Question 13.
Potable water is translucent.
Answer
Answer: False
Question 14.
We can use any amount of chlorine to purify water.
Answer
Answer: False
Question 15.
Water is a precious natural resource.
Answer
Answer: True
Question 16.
Depletion of ozone layer is known as marble cancer.
Answer
Answer: False
Question 17.
Water having high salt content can be purified by domestic water filter.
Answer
Answer: False
Question 18.
Smoking causes air pollution.
Answer
Answer: True
Question 19.
The most toxic air pollutant among the oxides of carbon is carbon monoxide.
Answer
Answer: True
Question 20.
Acid rain does not affect the soil and plants.
Answer
Answer: False
Question 21.
Sun’s rays do not warm the earth’s surface.
Answer
Answer: False
Question 22.
Carbon monoxide is a greenhouse gas.
Answer
Answer: False
Question 23.
Potable water is translucent.
Answer
Answer: False
Match the following
| Column I | Column II |
| 1. Methane | (a) Pollutants |
| 2. Marble cancer | (b) Weedicides and pesticides |
| 3. Agents that pollute | (c) Leads to degradation |
| 4. Oxygen | (d) Corrosion of marble |
| 5. Agricultural pollutants | (e) Greenhouse gas |
| 6. Water suitable for drinking | (f) 21% |
| 7. Pollution | (g) Potable water |
| 8. Smoke + fog | (h) Caused by smog |
| 9. Asthma | (i) Absorbed by CO2 |
| 10. Infrared radiation | (j) Smog |
Answer
Answer:
| Column I | Column II |
| 1. Methane | (e) Greenhouse gas |
| 2. Marble cancer | (d) Corrosion of marble |
| 3. Agents that pollute | (a) Pollutants |
| 4. Oxygen | (f) 21% |
| 5. Agricultural pollutants | (b) Weedicides and pesticides |
| 6. Water suitable for drinking | (g) Potable water |
| 7. Pollution | (c) Leads to degradation |
| 8. Smoke + fog | (j) Smog |
| 9. Asthma | (h) Caused by smog |
| 10. Infrared radiation | (i) Absorbed by CO2 |
| Column A | Column B |
| 1. Cholera | (a) Reduce, Reuse and Recycle |
| 2. Smog | (b) Contamination of water |
| 3. Carbon dioxide | (c) Acid rain |
| 4. Sulphur dioxide and nitrogen dioxide | (d) Smoke and fog |
| 5. The three R’s principle | (e) Global warming |
Answer
Answer:
| Column A | Column B |
| 1. Cholera | (b) Contamination of water |
| 2. Smog | (d) Smoke and fog |
| 3. Carbon dioxide | (e) Global warming |
| 4. Sulphur dioxide and nitrogen dioxide | (c) Acid rain |
| 5. The three R’s principle | (a) Reduce, Reuse and Recycle |
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