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