{"id":11581,"date":"2023-03-24T16:54:59","date_gmt":"2023-03-24T11:24:59","guid":{"rendered":"https:\/\/ncertsolutions.guru\/?p=11581"},"modified":"2023-03-24T17:28:02","modified_gmt":"2023-03-24T11:58:02","slug":"mcq-questions-for-class-8-science-chapter-18","status":"publish","type":"post","link":"https:\/\/ncertsolutions.guru\/mcq-questions-for-class-8-science-chapter-18\/","title":{"rendered":"MCQ Questions for Class 8 Science Chapter 18 Pollution of Air and Water"},"content":{"rendered":"

Students are advised to practice the NCERT MCQ Questions for Class 8 Science Chapter 18 Pollution of Air and Water with Answers Pdf free download is available here. MCQ Questions for Class 8 Science with Answers<\/a> are prepared as per the Latest Exam Pattern. Students can solve these Pollution of Air and Water Class 8 MCQs Questions with Answers and assess their preparation level.<\/p>\n

Pollution of Air and Water Class 8 MCQs Questions with Answers<\/h2>\n

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.<\/p>\n

Question 1.
\nCFC is:
\n(a) Chloro fluoro carbon
\n(b) Carbon fluo\u00a0 ro carbon
\n(c) Carbon fourme carbon
\n(d) Carbon fluoro chloro.<\/p>\n

\nAnswer<\/span><\/summary>\n

(a) Chloro fluoro carbon
\nCFC is Chloro fluoro carbon.<\/p>\n<\/details>\n

\n

Question 2.
\nThe reason for greenhouse effect is:
\n(a) Decrease in quantity of CO2<\/sub> in atmosphere
\n(b) Increase in quantity of CO2<\/sub> in atmosphere
\n(c) Decrease in quantity of oxygen in atmosphere
\n(d) Increase in quantity of oxygen in atmosphere<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) Increase in quantity of CO2<\/sub> in atmosphere
\nThe reason for greehouse effect is increase in quantity of CO2<\/sub> in atmosphere.<\/p>\n<\/details>\n

\n

Question 3.
\nThe gas depleting ozone layer is:
\n(a) Nitrogen.
\n(b) Oxygen
\n(c) CFC
\n(d) Carbon dioxide<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) Oxygen
\nThe gas depleting ozone layer is CFC.<\/p>\n<\/details>\n

\n

Question 4.
\nThe greenhouse effect gas is:
\n(a) CO2<\/sub>
\n(b) Methane
\n(c) CFC
\n(d) All of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(d) All of these
\nThe greenhouse effect gas is C02, methane and CFC.<\/p>\n<\/details>\n

\n

Question 5.
\nBetter fuel is:
\n(a) Peton
\n(b) Diesel
\n(c) Coal
\n(d) CNG<\/p>\n

\nAnswer<\/span><\/summary>\n

(d) CNG
\nBetter fuel is CNG .<\/p>\n<\/details>\n

\n

Question 6.
\nThe following gas is not an air pollutant:
\n(a) Carbon dioxide
\n(b) Oxides of nitrogen
\n(c) Sulphur dioxide
\n(d) Oxygen<\/p>\n

\nAnswer<\/span><\/summary>\n

(d) Oxygen
\nOxygen gas is not an air pollutant.<\/p>\n<\/details>\n

\n

Question 7.
\nThe following gas forms acid rain:
\n(a) Carbandioxide
\n(b) Ozone
\n(c) Sulphur dioxide
\n(d) Carbon monoxide<\/p>\n

\nAnswer<\/span><\/summary>\n

(c) Sulphur dioxide
\nSulphur dioxide gas forms acid rain.<\/p>\n<\/details>\n

\n

Question 8.
\nWhich of the following Is not a pollutant unless present in excess:
\n(a) Nitrogen dioxide
\n(b) Carbon dioxide
\n(c) Carbon monoxide
\n(d) Sulphur dioxide<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) Carbon dioxide
\nCarbon dioxide is not a pollutant unless present in excess.<\/p>\n<\/details>\n

\n

Question 9.
\nWhich of the following is not a greenhouse gas:
\n(a) Carbon dioxide
\n(b) Sulphur dioxide
\n(c) Methane
\n(d) Nitrogen<\/p>\n

\nAnswer<\/span><\/summary>\n

(d) Nitrogen
\nNitrogen is not a greenhouse gas. Gabon dioxide, sulphur dioxide, methane are greenhouse gases.<\/p>\n<\/details>\n

\n

Question 10.
\nAddition of harmful and poisonous substances in our environment is called:
\n(a) Population
\n(b) Pollution
\n(c) Purification
\n(d) None of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) Pollution
\nPollution is addition of harmful and poisonous substances in our environment.<\/p>\n<\/details>\n

\n

Question 11.
\nA poisonous gas emitted by Mathura Refinery and other industries in and around Taj which cause acid rain is:
\n(a) Carobon monoxide
\n(b) Methane
\n(c) Sulphur dioxide
\n(d) Oxygen<\/p>\n

\nAnswer<\/span><\/summary>\n

(c) Sulphur dioxide
\nSulphur dioxide is a poisonous gas emitted by Mathura Refinery and other industries in and around Taj which cause acid rain.<\/p>\n<\/details>\n

\n

Question 12.
\nThe Taj Mahal is being effected due to:
\n(a) Air pollution
\n(b) Water pollution
\n(c) Noise pollution
\n(d) None of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(a) Air pollution
\nAir pollution effects Taj Mahal.<\/p>\n<\/details>\n

\n

Question 13.
\nPotable water is the one that is:
\n(a) Kept in a pot
\n(b) Fit to drink
\n(c) Not fit to drink
\n(d) None of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) Fit to drink
\nPotable water is the one that the fit to drink.<\/p>\n<\/details>\n

\n

Question 14.
\nCorrosion of marble is also called:
\n(a) Marbleerrosion
\n(b) Marble cancer
\n(c) Marble disorder
\n(d) Marble disease<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) Marble cancer
\nCorrosion of marble is also called marble cancer.<\/p>\n<\/details>\n

\n

Question 15.
\nSmog is made up of:
\n(a) Smog and oxygen
\n(b) Sulphur dioxide and fog
\n(c) Smog and fog
\n(d) None of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(c) Smog and fog
\nSmog is made up of smog and fog.<\/p>\n<\/details>\n

\n

Question 16.
\nTrapping of unescapable radiations of sun in Earth\u2019s environment is called:
\n(a) Earth warming
\n(b) Greenhouse warming
\n(c) Greenhouse effect
\n(d) None of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(c) Greenhouse effect
\nGreenhouse effect is trapping of unescapable radiations of sun in Earth\u2019s environment.<\/p>\n<\/details>\n

\n

Question 17.
\nBhopal tragedy was caused due to:
\n(a) Air pollution
\n(b) Leakage of poisonous gas
\n(c) Waterpollution
\n(d) Noisepolution<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) Leakage of poisonous gas
\nBhopal tragedy was caused due to leakage of poisonous gas.<\/p>\n<\/details>\n

\n

Question 18.
\nThe disease caused due to contamination of water is:
\n(a) Cholera
\n(b) Lung Cancer
\n(c) Rabies
\n(d) Polio<\/p>\n

\nAnswer<\/span><\/summary>\n

(a) Cholera
\nCholera is caused due to contamination of water.<\/p>\n<\/details>\n

\n

Question 19.
\nAir pollution cause:
\n(a) Respiratory diseases
\n(b) Global warming
\n(c) Both (a) and (b)
\n(d) None of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(c) Both (a) and (b)
\nAir pollution cause respiratory diseases and global warming.<\/p>\n<\/details>\n

\n

Question 20.
\nIncomplete burning of fuels produces:
\n(a) Carbon dioxide
\n(b) Carbon particles
\n(c) Carbon monoxide
\n(d) None of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(c) Carbon monoxide
\nIncomplete burning of fuels produces carbon monoxide.<\/p>\n<\/details>\n

\n

Question 21.
\nCarbon monoxide:
\n(a) reduces the carbon dioxide – caryying capacity of the blood
\n(b) reduces the oxygen – carrying capacity of the blood
\n(c) increase the oxygen – carrying capacity of the blood
\n(d) None of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) reduces the oxygen – carrying capacity of the blood
\nCarbon monoxide reduces the oxygen – carrying capacity of the blood.<\/p>\n<\/details>\n

\n

Question 22.
\nOzone layer protect us from:
\n(a) Infrared rays
\n(b) Ultraviolet rays
\n(c) White light of sun
\n(d) None of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) Ultraviolet rays
\nOzone layer protect us from ultraviolet rays.<\/p>\n<\/details>\n

\n

Question 23.
\nDeforestation leads to an increase in the amount of in the air.
\n(a) Carbon monoxide
\n(b) Nitrogen dioxide
\n(c) Sulphur dioxide
\n(d) Carbon dioxide<\/p>\n

\nAnswer<\/span><\/summary>\n

(d) Carbon dioxide
\nDeforestation leads to an increase in the amount of carbon dioxide in the air.<\/p>\n<\/details>\n

\n

Question 24.
\nGangotri glacier in the Himabyaslias started melting because of:
\n(a) More rain
\n(b) Less snow
\n(c) Global warming
\n(d) None of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(c) Global warming
\nGangotri glacier in the Himalayas has started melting because of global<\/p>\n<\/details>\n

\n

Question 25.
\nInstead of the fossil fuels for our energy requirements we can use :
\n(a) Solar energy
\n(b) Hydropower
\n(c) Wind energy
\n(d) All of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(d) All of these
\nInstead of the fossil fuels for our every requirements we can use solar energy, hydropower, wind energy.<\/p>\n<\/details>\n

\n

Question 26.
\nGanga Action Plan was launched in:
\n(a) 1985
\n(b) 1986
\n(c) 1995
\n(d) 1958<\/p>\n

\nAnswer<\/span><\/summary>\n

(a) 1985
\nGanga Action Plan was launched in 1985.<\/p>\n<\/details>\n

\n

Question 27.
\nWater pollution is mainly caused by:
\n(a) Vehicular fumes
\n(b) Discharging toxic chemical wastes into the river
\n(c) Washing of clothes in the river
\n(d) None of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) Discharging toxic chemical wastes into the river
\nWater pollution is mainly caused by discharging toxic chemcial wastes into the<\/p>\n<\/details>\n

\n

Question 28.
\nChemical method used for purifyln water is:
\n(a) Boiling
\n(b) Using filter
\n(c) Chlorination
\n(d) All of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(c) Chlorination
\nChlorination is the chemical method used for purifying water.<\/p>\n<\/details>\n

\n

Question 29.
\nParticulate matter is the:
\n(a) Moisture in the air
\n(b) Solid particles in the air
\n(c) Solid particles in soil
\n(d) Solid particles in water<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) Solid particles in the air
\nParticular matter is the solid particles in the air.<\/p>\n<\/details>\n

\n

Question 30.
\nEpidemics such as typhoid aud jaundice are caused by:
\n(a) Metals
\n(b) Toxic chemicals
\n(c) Micro-oganisms
\n(d) Dissolved salts<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) Toxic chemicals
\nEpidemics such as typhoid and jaundice are caused by toxic chemicals.<\/p>\n<\/details>\n

\n

Match the Column-A with Column-B:<\/span><\/p>\n

Question 1.<\/p>\n\n\n\n\n\n\n\n\n
Column-A<\/strong><\/td>\nColumn-B<\/strong><\/td>\n<\/tr>\n
(a) Pollutants<\/td>\n(i) Water pollution<\/td>\n<\/tr>\n
(b) Carbon dioxide<\/td>\n(ii) Sulphuric acid and nitric acid<\/td>\n<\/tr>\n
(c) CNG and LPG<\/td>\n(iii) Pollution<\/td>\n<\/tr>\n
(d) Acid rain<\/td>\n(iv) Greenhouse gas<\/td>\n<\/tr>\n
(e) Untreated sewage and garbage<\/td>\n(v) Pollution free fuel<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\nAnswer<\/span><\/summary>\n\n\n\n\n\n\n\n\n
Column-A<\/strong><\/td>\nColumn-B<\/strong><\/td>\n<\/tr>\n
(a) Pollutants<\/td>\n(iii) Pollution<\/td>\n<\/tr>\n
(b) Carbon dioxide<\/td>\n(iv) Greenhouse gas<\/td>\n<\/tr>\n
(c) CNG and LPG<\/td>\n(v) Pollution free fuel<\/td>\n<\/tr>\n
(d) Acid rain<\/td>\n(ii) Sulphuric acid and nitric acid<\/td>\n<\/tr>\n
(e) Untreated sewage and garbage<\/td>\n(i) Water pollution<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/details>\n
\n

Question 2.<\/p>\n\n\n\n\n\n\n\n\n
Column-A<\/strong><\/td>\nColumn-B<\/strong><\/td>\n<\/tr>\n
(a) Sulphur dioxide<\/td>\n(i) Purification of water<\/td>\n<\/tr>\n
(b) Carbon monoxide<\/td>\n(ii) Global warming<\/td>\n<\/tr>\n
(c) Melting of glaciers<\/td>\n(iii) Damage ozone layer<\/td>\n<\/tr>\n
(d) Chlorination<\/td>\n(iv) Air pollution<\/td>\n<\/tr>\n
(e) Chlorofluorocarbon<\/td>\n(v) Incomplete combustion of fuel<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\nAnswer<\/span><\/summary>\n\n\n\n\n\n\n\n\n
Column-A<\/strong><\/td>\nColumn-B<\/strong><\/td>\n<\/tr>\n
(a) Sulphur dioxide<\/td>\n(iv) Air pollution<\/td>\n<\/tr>\n
(b) Carbon monoxide<\/td>\n(v) Incomplete combustion of fuel<\/td>\n<\/tr>\n
(c) Melting of glaciers<\/td>\n(ii) Global warming<\/td>\n<\/tr>\n
(d) Chlorination<\/td>\n(i) Purification of water<\/td>\n<\/tr>\n
(e) Chlorofluorocarbon<\/td>\n(iii) Damage ozone layer<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/details>\n
\n

Question 3.<\/p>\n\n\n\n\n\n\n\n
Column-A<\/strong><\/td>\nColumn-B<\/strong><\/td>\n<\/tr>\n
(a) The mantra for saving water is<\/td>\n(i) acid rain<\/td>\n<\/tr>\n
(b) Excessive quantities of chemicals getting washed from fields and reaching ponds<\/td>\n(ii) Van Mahotsava<\/td>\n<\/tr>\n
(c) Lakhs of trees are planted in July every year<\/td>\n(iii) reduce, reuse and recycle<\/td>\n<\/tr>\n
(d) The white marble of Taj Mahal is discolouring<\/td>\n(iv) helps algae to flourish<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\nAnswer<\/span><\/summary>\n\n\n\n\n\n\n\n
Column-A<\/strong><\/td>\nColumn-B<\/strong><\/td>\n<\/tr>\n
(a) The mantra for saving water is<\/td>\n(iii) reduce, reuse and recycle<\/td>\n<\/tr>\n
(b) Excessive quantities of chemicals getting washed from fields and reaching ponds<\/td>\n(iv) helps algae to flourish<\/td>\n<\/tr>\n
(c) Lakhs of trees are planted in July every year<\/td>\n(ii) Van Mahotsava<\/td>\n<\/tr>\n
(d) The white marble of Taj Mahal is discolouring<\/td>\n(i) acid rain<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/details>\n
\n

State whether the following statements are True or False:<\/span>
\nQuestion 1.
\nCNG contain sulphur which forms sulphur dioxide upon burning.<\/p>\n

\nAnswer<\/span><\/summary>\n

False<\/p>\n<\/details>\n

\n

Question 2.
\nCO2<\/sub> is very good to absorbing the sun\u2019s heat.<\/p>\n

\nAnswer<\/span><\/summary>\n

True<\/p>\n<\/details>\n

\n

Question 3.
\nThere are no alternatives for fossil fuels.<\/p>\n

\nAnswer<\/span><\/summary>\n

False<\/p>\n<\/details>\n

\n

Question 4.
\nWater pollution is caused by the smoke given out by factories.<\/p>\n

\nAnswer<\/span><\/summary>\n

False<\/p>\n<\/details>\n

\n

Question 5.
\nWaste water from agricultural land do not cause water pollution.<\/p>\n

\nAnswer<\/span><\/summary>\n

False<\/p>\n<\/details>\n

\n

Question 6.
\nCarbon dioxide, ozone, methane and water vapour are all greenhouse gases.<\/p>\n

\nAnswer<\/span><\/summary>\n

False<\/p>\n<\/details>\n

\n

Question 7.
\nInfants in the same room with a smoker are exposed to indoor air pollution.<\/p>\n

\nAnswer<\/span><\/summary>\n

True<\/p>\n<\/details>\n

\n

Question 8.
\nBreathing in of suspended particulate matter is not as harmful as the breathing of CO2<\/sub>.<\/p>\n

\nAnswer<\/span><\/summary>\n

False<\/p>\n<\/details>\n

\n

Question 9.
\nGlobal warming is gradual increase in the temperature of the Earth, due to excess carbon dioxide present in the atmosphere.<\/p>\n

\nAnswer<\/span><\/summary>\n

True<\/p>\n<\/details>\n

\n

Question 10.
\nPotable water is free from germs and impurities and is fit for drinking.<\/p>\n

\nAnswer<\/span><\/summary>\n

True<\/p>\n<\/details>\n

\n

Question 11.
\nAlgae bloom provides a rich source of oxygen for the water body that helps aquatic plants and animals.<\/p>\n

\nAnswer<\/span><\/summary>\n

True<\/p>\n<\/details>\n

\n

Question 12.
\nOzone layer protects us from harmful infrared rays of the sun.<\/p>\n

\nAnswer<\/span><\/summary>\n

False<\/p>\n<\/details>\n

\n

Question 13.
\nCarbon monoxide reduces the oxygen – carrying capacity of the blood.<\/p>\n

\nAnswer<\/span><\/summary>\n

True<\/p>\n<\/details>\n

\n

Question 14.
\nIt is advisable to bum dry leaves.<\/p>\n

\nAnswer<\/span><\/summary>\n

False<\/p>\n<\/details>\n

\n

Fill in the blanks:<\/span><\/p>\n

Question 1.
\nSubstances causing pollution are called …………………….<\/p>\n

\nAnswer<\/span><\/summary>\n

pollutants<\/p>\n<\/details>\n

\n

Question 2.
\n……………………. is formed when acids fall with rain water.<\/p>\n

\nAnswer<\/span><\/summary>\n

Acid rain<\/p>\n<\/details>\n

\n

Question 3.
\nThe major components of air are ……………………. (78%) and ……………………. (21%).<\/p>\n

\nAnswer<\/span><\/summary>\n

nitrogen, oxygen<\/p>\n<\/details>\n

\n

Question 4.
\nWhen a forest fuel bums in insufficient amount of air, ……………………. is formed.<\/p>\n

\nAnswer<\/span><\/summary>\n

carbon monoxide<\/p>\n<\/details>\n

\n

Question 5.
\nThe mixture of smoke and fog is called …………………….<\/p>\n

\nAnswer<\/span><\/summary>\n

smog<\/p>\n<\/details>\n

\n

smog
\nQuestion 6.
\nCholera is a ……………………. borne disease.<\/p>\n

\nAnswer<\/span><\/summary>\n

water<\/p>\n<\/details>\n

\n

Question 7.
\n……………………. of fuels in vehicles cause smoke.<\/p>\n

\nAnswer<\/span><\/summary>\n

Incomplete combustion<\/p>\n<\/details>\n

\n

Question 8.
\nGreen substance seen on the .surface of water in ponds is ……………………..<\/p>\n

\nAnswer<\/span><\/summary>\n

Algae<\/p>\n<\/details>\n

\n

Question 9.
\nWater that can be consumed by humans without concerns for adverse health effects is called ……………………. water.<\/p>\n

\nAnswer<\/span><\/summary>\n

potable<\/p>\n<\/details>\n

\n

Question 10.
\nCFC\u2019s cause depletion of the ……………………. layer.<\/p>\n

\nAnswer<\/span><\/summary>\n

ozone<\/p>\n<\/details>\n

\n

Question 11.
\nSewage should be ……………………. before releasing in water.<\/p>\n

\nAnswer<\/span><\/summary>\n

treated<\/p>\n<\/details>\n

\n

Question 12.
\nTwo greenhouse gases are ……………………. and ……………………..<\/p>\n

\nAnswer<\/span><\/summary>\n

CO2<\/sub> and methane<\/p>\n<\/details>\n

\n

Question 13.
\nAlgae can be used to produce oxygen by the ……………………. process.<\/p>\n

\nAnswer<\/span><\/summary>\n

photosynthesis<\/p>\n<\/details>\n

\n

Question 14.
\nBacteria feeding on dead algae make water deficient in ……………………..<\/p>\n

\nAnswer<\/span><\/summary>\n

oxygen<\/p>\n<\/details>\n

\n

Question 15.
\nTwo clean fuels are ……………………. and ……………………..<\/p>\n

\nAnswer<\/span><\/summary>\n

CNG and LPG<\/p>\n<\/details>\n

\n

Question 16.
\nGanga Action Plan was to reduce the ……………………. levels in the river.<\/p>\n

\nAnswer<\/span><\/summary>\n

pollution<\/p>\n<\/details>\n

\n

Question 17.
\nLPG is ……………………. ……………………. …………………….<\/p>\n

\nAnswer<\/span><\/summary>\n

Liquified Petroluem Gas<\/p>\n<\/details>\n

\n

Question 18.
\nCNG is ……………………. ……………………. …………………….<\/p>\n

\nAnswer<\/span><\/summary>\n

Compressed Natural Gas<\/p>\n<\/details>\n

\n

Question 19.
\nDeforestation leads to an increase in the amount of ……………………..<\/p>\n

\nAnswer<\/span><\/summary>\n

Carbon dioxide<\/p>\n<\/details>\n

\n

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Students are advised to practice the NCERT MCQ Questions for Class 8 Science Chapter 18 Pollution of Air and Water with Answers Pdf free download is available here. MCQ Questions for Class 8 Science with Answers are prepared as per the Latest Exam Pattern. Students can solve these Pollution of Air and Water Class 8 …<\/p>\n

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