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Pollution of Air and Water Class 8 MCQs Questions with Answers
Solving the Pollution of Air and Water Multiple Choice Questions of Class 8 Science Chapter 18 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Pollution of Air and Water Class 8 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 18 Science Class 8 and cross-check your answers during preparation.
Question 1.
CFC is:
(a) Chloro fluoro carbon
(b) Carbon fluo ro carbon
(c) Carbon fourme carbon
(d) Carbon fluoro chloro.
Answer
(a) Chloro fluoro carbon
CFC is Chloro fluoro carbon.
Question 2.
The reason for greenhouse effect is:
(a) Decrease in quantity of CO2 in atmosphere
(b) Increase in quantity of CO2 in atmosphere
(c) Decrease in quantity of oxygen in atmosphere
(d) Increase in quantity of oxygen in atmosphere
Answer
(b) Increase in quantity of CO2 in atmosphere
The reason for greehouse effect is increase in quantity of CO2 in atmosphere.
Question 3.
The gas depleting ozone layer is:
(a) Nitrogen.
(b) Oxygen
(c) CFC
(d) Carbon dioxide
Answer
(b) Oxygen
The gas depleting ozone layer is CFC.
Question 4.
The greenhouse effect gas is:
(a) CO2
(b) Methane
(c) CFC
(d) All of these
Answer
(d) All of these
The greenhouse effect gas is C02, methane and CFC.
Question 5.
Better fuel is:
(a) Peton
(b) Diesel
(c) Coal
(d) CNG
Answer
(d) CNG
Better fuel is CNG .
Question 6.
The following gas is not an air pollutant:
(a) Carbon dioxide
(b) Oxides of nitrogen
(c) Sulphur dioxide
(d) Oxygen
Answer
(d) Oxygen
Oxygen gas is not an air pollutant.
Question 7.
The following gas forms acid rain:
(a) Carbandioxide
(b) Ozone
(c) Sulphur dioxide
(d) Carbon monoxide
Answer
(c) Sulphur dioxide
Sulphur dioxide gas forms acid rain.
Question 8.
Which of the following Is not a pollutant unless present in excess:
(a) Nitrogen dioxide
(b) Carbon dioxide
(c) Carbon monoxide
(d) Sulphur dioxide
Answer
(b) Carbon dioxide
Carbon dioxide is not a pollutant unless present in excess.
Question 9.
Which of the following is not a greenhouse gas:
(a) Carbon dioxide
(b) Sulphur dioxide
(c) Methane
(d) Nitrogen
Answer
(d) Nitrogen
Nitrogen is not a greenhouse gas. Gabon dioxide, sulphur dioxide, methane are greenhouse gases.
Question 10.
Addition of harmful and poisonous substances in our environment is called:
(a) Population
(b) Pollution
(c) Purification
(d) None of these
Answer
(b) Pollution
Pollution is addition of harmful and poisonous substances in our environment.
Question 11.
A poisonous gas emitted by Mathura Refinery and other industries in and around Taj which cause acid rain is:
(a) Carobon monoxide
(b) Methane
(c) Sulphur dioxide
(d) Oxygen
Answer
(c) Sulphur dioxide
Sulphur dioxide is a poisonous gas emitted by Mathura Refinery and other industries in and around Taj which cause acid rain.
Question 12.
The Taj Mahal is being effected due to:
(a) Air pollution
(b) Water pollution
(c) Noise pollution
(d) None of these
Answer
(a) Air pollution
Air pollution effects Taj Mahal.
Question 13.
Potable water is the one that is:
(a) Kept in a pot
(b) Fit to drink
(c) Not fit to drink
(d) None of these
Answer
(b) Fit to drink
Potable water is the one that the fit to drink.
Question 14.
Corrosion of marble is also called:
(a) Marbleerrosion
(b) Marble cancer
(c) Marble disorder
(d) Marble disease
Answer
(b) Marble cancer
Corrosion of marble is also called marble cancer.
Question 15.
Smog is made up of:
(a) Smog and oxygen
(b) Sulphur dioxide and fog
(c) Smog and fog
(d) None of these
Answer
(c) Smog and fog
Smog is made up of smog and fog.
Question 16.
Trapping of unescapable radiations of sun in Earth’s environment is called:
(a) Earth warming
(b) Greenhouse warming
(c) Greenhouse effect
(d) None of these
Answer
(c) Greenhouse effect
Greenhouse effect is trapping of unescapable radiations of sun in Earth’s environment.
Question 17.
Bhopal tragedy was caused due to:
(a) Air pollution
(b) Leakage of poisonous gas
(c) Waterpollution
(d) Noisepolution
Answer
(b) Leakage of poisonous gas
Bhopal tragedy was caused due to leakage of poisonous gas.
Question 18.
The disease caused due to contamination of water is:
(a) Cholera
(b) Lung Cancer
(c) Rabies
(d) Polio
Answer
(a) Cholera
Cholera is caused due to contamination of water.
Question 19.
Air pollution cause:
(a) Respiratory diseases
(b) Global warming
(c) Both (a) and (b)
(d) None of these
Answer
(c) Both (a) and (b)
Air pollution cause respiratory diseases and global warming.
Question 20.
Incomplete burning of fuels produces:
(a) Carbon dioxide
(b) Carbon particles
(c) Carbon monoxide
(d) None of these
Answer
(c) Carbon monoxide
Incomplete burning of fuels produces carbon monoxide.
Question 21.
Carbon monoxide:
(a) reduces the carbon dioxide – caryying capacity of the blood
(b) reduces the oxygen – carrying capacity of the blood
(c) increase the oxygen – carrying capacity of the blood
(d) None of these
Answer
(b) reduces the oxygen – carrying capacity of the blood
Carbon monoxide reduces the oxygen – carrying capacity of the blood.
Question 22.
Ozone layer protect us from:
(a) Infrared rays
(b) Ultraviolet rays
(c) White light of sun
(d) None of these
Answer
(b) Ultraviolet rays
Ozone layer protect us from ultraviolet rays.
Question 23.
Deforestation leads to an increase in the amount of in the air.
(a) Carbon monoxide
(b) Nitrogen dioxide
(c) Sulphur dioxide
(d) Carbon dioxide
Answer
(d) Carbon dioxide
Deforestation leads to an increase in the amount of carbon dioxide in the air.
Question 24.
Gangotri glacier in the Himabyaslias started melting because of:
(a) More rain
(b) Less snow
(c) Global warming
(d) None of these
Answer
(c) Global warming
Gangotri glacier in the Himalayas has started melting because of global
Question 25.
Instead of the fossil fuels for our energy requirements we can use :
(a) Solar energy
(b) Hydropower
(c) Wind energy
(d) All of these
Answer
(d) All of these
Instead of the fossil fuels for our every requirements we can use solar energy, hydropower, wind energy.
Question 26.
Ganga Action Plan was launched in:
(a) 1985
(b) 1986
(c) 1995
(d) 1958
Answer
(a) 1985
Ganga Action Plan was launched in 1985.
Question 27.
Water pollution is mainly caused by:
(a) Vehicular fumes
(b) Discharging toxic chemical wastes into the river
(c) Washing of clothes in the river
(d) None of these
Answer
(b) Discharging toxic chemical wastes into the river
Water pollution is mainly caused by discharging toxic chemcial wastes into the
Question 28.
Chemical method used for purifyln water is:
(a) Boiling
(b) Using filter
(c) Chlorination
(d) All of these
Answer
(c) Chlorination
Chlorination is the chemical method used for purifying water.
Question 29.
Particulate matter is the:
(a) Moisture in the air
(b) Solid particles in the air
(c) Solid particles in soil
(d) Solid particles in water
Answer
(b) Solid particles in the air
Particular matter is the solid particles in the air.
Question 30.
Epidemics such as typhoid aud jaundice are caused by:
(a) Metals
(b) Toxic chemicals
(c) Micro-oganisms
(d) Dissolved salts
Answer
(b) Toxic chemicals
Epidemics such as typhoid and jaundice are caused by toxic chemicals.
Match the Column-A with Column-B:
Question 1.
| Column-A | Column-B |
| (a) Pollutants | (i) Water pollution |
| (b) Carbon dioxide | (ii) Sulphuric acid and nitric acid |
| (c) CNG and LPG | (iii) Pollution |
| (d) Acid rain | (iv) Greenhouse gas |
| (e) Untreated sewage and garbage | (v) Pollution free fuel |
Answer
| Column-A | Column-B |
| (a) Pollutants | (iii) Pollution |
| (b) Carbon dioxide | (iv) Greenhouse gas |
| (c) CNG and LPG | (v) Pollution free fuel |
| (d) Acid rain | (ii) Sulphuric acid and nitric acid |
| (e) Untreated sewage and garbage | (i) Water pollution |
Question 2.
| Column-A | Column-B |
| (a) Sulphur dioxide | (i) Purification of water |
| (b) Carbon monoxide | (ii) Global warming |
| (c) Melting of glaciers | (iii) Damage ozone layer |
| (d) Chlorination | (iv) Air pollution |
| (e) Chlorofluorocarbon | (v) Incomplete combustion of fuel |
Answer
| Column-A | Column-B |
| (a) Sulphur dioxide | (iv) Air pollution |
| (b) Carbon monoxide | (v) Incomplete combustion of fuel |
| (c) Melting of glaciers | (ii) Global warming |
| (d) Chlorination | (i) Purification of water |
| (e) Chlorofluorocarbon | (iii) Damage ozone layer |
Question 3.
| Column-A | Column-B |
| (a) The mantra for saving water is | (i) acid rain |
| (b) Excessive quantities of chemicals getting washed from fields and reaching ponds | (ii) Van Mahotsava |
| (c) Lakhs of trees are planted in July every year | (iii) reduce, reuse and recycle |
| (d) The white marble of Taj Mahal is discolouring | (iv) helps algae to flourish |
Answer
| Column-A | Column-B |
| (a) The mantra for saving water is | (iii) reduce, reuse and recycle |
| (b) Excessive quantities of chemicals getting washed from fields and reaching ponds | (iv) helps algae to flourish |
| (c) Lakhs of trees are planted in July every year | (ii) Van Mahotsava |
| (d) The white marble of Taj Mahal is discolouring | (i) acid rain |
State whether the following statements are True or False:
Question 1.
CNG contain sulphur which forms sulphur dioxide upon burning.
Answer
False
Question 2.
CO2 is very good to absorbing the sun’s heat.
Answer
True
Question 3.
There are no alternatives for fossil fuels.
Answer
False
Question 4.
Water pollution is caused by the smoke given out by factories.
Answer
False
Question 5.
Waste water from agricultural land do not cause water pollution.
Answer
False
Question 6.
Carbon dioxide, ozone, methane and water vapour are all greenhouse gases.
Answer
False
Question 7.
Infants in the same room with a smoker are exposed to indoor air pollution.
Answer
True
Question 8.
Breathing in of suspended particulate matter is not as harmful as the breathing of CO2.
Answer
False
Question 9.
Global warming is gradual increase in the temperature of the Earth, due to excess carbon dioxide present in the atmosphere.
Answer
True
Question 10.
Potable water is free from germs and impurities and is fit for drinking.
Answer
True
Question 11.
Algae bloom provides a rich source of oxygen for the water body that helps aquatic plants and animals.
Answer
True
Question 12.
Ozone layer protects us from harmful infrared rays of the sun.
Answer
False
Question 13.
Carbon monoxide reduces the oxygen – carrying capacity of the blood.
Answer
True
Question 14.
It is advisable to bum dry leaves.
Answer
False
Fill in the blanks:
Question 1.
Substances causing pollution are called …………………….
Answer
pollutants
Question 2.
……………………. is formed when acids fall with rain water.
Answer
Acid rain
Question 3.
The major components of air are ……………………. (78%) and ……………………. (21%).
Answer
nitrogen, oxygen
Question 4.
When a forest fuel bums in insufficient amount of air, ……………………. is formed.
Answer
carbon monoxide
Question 5.
The mixture of smoke and fog is called …………………….
Answer
smog
smog
Question 6.
Cholera is a ……………………. borne disease.
Answer
water
Question 7.
……………………. of fuels in vehicles cause smoke.
Answer
Incomplete combustion
Question 8.
Green substance seen on the .surface of water in ponds is ……………………..
Answer
Algae
Question 9.
Water that can be consumed by humans without concerns for adverse health effects is called ……………………. water.
Answer
potable
Question 10.
CFC’s cause depletion of the ……………………. layer.
Answer
ozone
Question 11.
Sewage should be ……………………. before releasing in water.
Answer
treated
Question 12.
Two greenhouse gases are ……………………. and ……………………..
Answer
CO2 and methane
Question 13.
Algae can be used to produce oxygen by the ……………………. process.
Answer
photosynthesis
Question 14.
Bacteria feeding on dead algae make water deficient in ……………………..
Answer
oxygen
Question 15.
Two clean fuels are ……………………. and ……………………..
Answer
CNG and LPG
Question 16.
Ganga Action Plan was to reduce the ……………………. levels in the river.
Answer
pollution
Question 17.
LPG is ……………………. ……………………. …………………….
Answer
Liquified Petroluem Gas
Question 18.
CNG is ……………………. ……………………. …………………….
Answer
Compressed Natural Gas
Question 19.
Deforestation leads to an increase in the amount of ……………………..
Answer
Carbon dioxide
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