Pollutants and Their Effects on Environment Class 8 Science MCQ Question and Answers. Important MCQ on Pollutants and Their Effects on Environment 8th Standard Mathematics Subject.
Pollutants and Their Effects on Environment Class 8 Science MCQ
Choose the best answer
1) The most dangerous type of pollution is:
a) Water pollution. b) air pollution. c) Noise pollution. d) Land pollution.
Ans. Air pollution
2) Name the major cause of depletion of ozone layer:
a) Carbon dioxide. b) Sulphur dioxide. c) Chlorofluorocarbon. d) Oxygen.
Ans.Chlorofluorocarbon
3) Which gas is emitted by incomplete combustion of fuel.
a) Carbon monoxide. b) chlorofluorocarbon. ¢) Carbon dioxide. d) Sulphur dioxide.
Ans. Carbon monoxide
4) The layer which protects the earth is called:
a) Ozone. b) oxygen layer. c) CFC layer. d) Green house.
Ans. Ozone
5) Which gas from the following is mainly responsible for Green House effect in the environment?
a) Nitrogen dioxide. b) Methane. c) Sulphur Dioxide. d) Carbon Dioxide.
Ans. Carbon dioxide
6) The phenomenon which leads to destruction of manmade structure and metal of archaeological importance is:
a) Floods. b) Tsunami. c) Acid rain. d) Green House.
Ans.Acid rain
7) The step which can save the earth and natural resources:
a) Wastage of water. b) gas engines in the air. c) use recycled and reusable material. d) deforestation.
Ans. Use recycled and reusable material
8) The animal included in the endangered species is:
a) Deers. b) Giant pandas. c) Jackals. d) Cat.
Ans. Giant pandas
9) The poisonous gas which is the main byproduct of motor vehicle with irritating smell is:
a) Oxygen. b) Sulphur Dioxide. c) Silver Nitrate. d) Ammonia.
Ans. Sulphur Dioxide
10) The ozone layer is present in the atmosphere approximately:
a) 5 to 10 Km high up the ground.
b) 16 to 20 Km high up the ground.
c) 12 to 50 Km high up the ground.
d) 16 to 50 Km high up the ground.
Ans12 to 50 km high up the ground
11) Human activities such as construction, vehicular emissions and _______ leads to pollution.
a) afforestation b) deforestation c) recycling d) reusing
Ans. Deforestation
12) Which of the following is not an air pollutant
a) Sulphur Dioxide b) oxides of nitrogen
c) Chlorofluorocarbons d) pesticide
Ans. Pesticide
13) it’s a group of gasses which are widely used as refrigerants
a) CFC b) carbon monoxide c) carbon dioxide d) carbonate
Ans. CFC
14) Acid rain are caused due to the solution of the following gases in rain water
a) nitrogen dioxide and nitrogen b) Sulphur dioxide and Sulphur
c) nitrogen and Sulphur dioxide d) Sulphur Dioxide and nitrogen dioxide
Ans. Sulphur Dioxide and nitrogen dioxide
15) The increase in the average temperature of the surface of the earth is called as
a) eutrophication b) green house c) global warming
d) depletion
Ans. Global warming
16) The Ozone protects the earth and the organisms from harmful effects of _____ rays of the sun.
a) gamma b) ultraviolet c) xray d) ultrasonic
Ans. Ultraviolet
17) paper, mining, logging, agriculture expansion and climate change are the leading causes of
a) ozone depletion b) global warming c) water pollution d) deforestation
Ans. Deforestation
18) Common materials we use every day such as latex, cork, fruit, nuts, and resins are found in the _____ forest.
a) tropical b) evergreen c) deciduous d) thorn
Ans. Tropical
19) Measures such as afforestation , recycling and ____ could be followed to reduce pollution
a) hunting b) use of plastics bags c)reusing d) burning
Ans. Reusing
20) It’s the main gas responsible for asthma attacks
a) carbon dioxide b) Sulphur Dioxide c) nitrogen dioxide d) methane
Ans. Sulphur dioxide
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