Here we are providing Class 8 Science Objective Chapter – 18 Pollution of Air and Water because its very important for Class 8 students as we all know that every board exam question has MCQs so that students should practice these questions so that students can get good marks in board. Class 8 Science Objective Chapter – 18 Pollution of Air and Water is an extremely important and its also a year in which students learn the fundamentals of concepts that help them lay a solid foundation for their higher education. Here we are providing in Class Class 8 Science Objective Chapter – 18 Pollution of Air and Water 100+ questions so that students practice more and more. If you want class wise Notes Then Click Here
Class 8 Science Objective Chapter – 18 Pollution of Air and Water
1. Which gas is the major pollutant of air?
( A ) Carbon monoxide
( B ) Nitrogen
( C ) Oxygen
( D ) Propane
Ans – ( A )
2.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
Ans – ( B )
3.In which year Ganga Action Plan was launched?
( A ) 1980
( B ) 1984
( C ) 1982
( D ) 1985
Ans – ( D )
4. CFC is:
( A ) Chloro fluoro carbon
( B ) Carbon fluo ro carbon
( C ) Carbon fourme carbon
( D ) Carbon fluoro chloro.
Ans – ( A )
5.Which of the following contents is most harmful to aquatic animals?
( A ) Heavy metal ions
( B ) Sodium ions
( C ) Potassium ions
( D ) Chloride ions
Ans – ( A )
6. The increase in concentration of which gas is not responsible for Global Warming?
( A ) Sulphur dioxide
( B ) Nitrogen
( C ) Carbon dioxide
( D ) Methane
Ans – ( B )
7.Water containing high salt concentration can be purified by
( A ) boiling
( B ) UV irradiation
( C ) filtration
( D ) reverse osmosis
Ans – ( D )
8. 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
Ans – ( B )
9.Which of the following is a non-biodegradable pollutant?
( A ) Sulphur dioxide
( B ) DDT
( C ) Nitrogen oxide
( D ) Hydrogen oxide
Ans – ( B )
10. In which year Ganga Action Plan was launched?
( A ) 1980
( B ) 1984
( C ) 1982
( D ) 1985
Ans – ( D )
11.Which of the following is a major source of water pollution?
( A ) Sulphur dioxide
( B ) Nitrogen oxide
( C ) DDT
( D ) Hydrogen oxide
Ans – ( C )
12.Which of the following is not a source of air pollution?
( A ) Automobile exhaust
( B ) Burning of firewood
( C ) Windmill
( D ) Power plant
Ans – ( A )
13.The Taj Mahal is being affected due to
( A ) noise pollution
( B ) air pollution
( C ) water pollution
( D ) soil pollution
Ans – ( B )
14. The gas depleting ozone layer is:
( A ) Nitrogen.
( B ) Oxygen
( C ) CFC
( D ) Carbon dioxide
Ans – ( B )
15.Boojho wishes to contribute in reducing air pollution. Which vehicle should he use for going to school?
( A ) Car
( B ) School bus
( C ) Autorickshaw
( D ) Scooter
Ans – ( B )
16.Greenhouse gas is
( A ) nitrogen
( B ) methane
( C ) carbon dioxide
( D ) both ( B ) and (c)
Ans – ( D )
17. What radiations are absorbed by CO2?
( A ) Ultrared radiations
( B ) Infrared radiations
( C ) Ultraviolet radiations
( D ) None of these
Ans – ( B )
18.Pollution of water is due to
( A ) oil refineries
( B ) paper factories
( C ) sugar mills
( D ) all of these
Ans – ( D )
19. The greenhouse effect gas is:
( A ) CO2
( B ) Methane
( C ) CFC
( D ) All of these
Ans – ( D )
20.The percentage of nitrogen is
( A ) 21%
( B ) 78%
( C ) 12%
( D ) 87%
Ans – ( B )
21. Which element is present in the exhaust of automobiles?
( A ) Lead
( B ) Calcium
( C ) Chromium
( D ) Magnesium
Ans – ( A )
22.Chlorofluorocarbon is used in
( A ) refrigerators
( B ) air conditioners
( C ) aerosol sprays
( D ) all of these
Ans – ( D )
23. Better fuel is:
( A ) Peton
( B ) Diesel
( C ) Coal
( D ) CNG
Ans – ( D )
24.Which of the following is not a way to conserve water?
( A ) Replace
( B ) Reuse
( C ) Reduce
( D ) Recycle
Ans – ( A )
25. The phenomenon of marble cancer is due to
( A ) soil particles
( B ) fog
( C ) CFCs
( D ) acid rain
Ans – ( D )
26.Water suitable for drinking is known as
( A ) impure water
( B ) pure water
( C ) potable water
( D ) safe water
Ans – ( C )
27. The following gas is not an air pollutant:
( A ) Carbon dioxide
( B ) Oxides of nitrogen
( C ) Sulphur dioxide
( D ) Oxygen
Ans – ( D )
28.The disease caused due to contamination of water is:
( A ) Cholera
( B ) Lung Cancer
( C ) Rabies
( D ) Polio
Ans – ( A )
29. The solid or liquid particles dispersed in the air are called
( A ) oxides
( B ) acids
( C ) hydrocarbons
( D ) aerosols
Ans – ( D )
30.Air pollution cause:
( A ) Respiratory diseases
( B ) Global warming
( C ) Both ( A ) and (b)
( D ) None of these
Ans – ( C )
31. The following gas forms acid rain:
( A ) Carbandioxide
( B ) Ozone
( C ) Sulphur dioxide
( D ) Carbon monoxide
Ans – ( C )
32.Incomplete burning of fuels produces:
( A ) Carbon dioxide
( B ) Carbon particles
( C ) Carbon monoxide
( D ) None of these
Ans – ( C )
33. The type of pollution which is likely to affect Taj Mahal in Agra to a greater extent is
( A ) air pollution
( B ) soil pollution
( C ) water pollution
( D ) noise pollution
Ans – ( A )
34.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
Ans – ( B )
35. Which of the following Is not a pollutant unless present in excess:
( A ) Nitrogen dioxide
( B ) Carbon dioxide
( C ) Carbon monoxide
( D ) Sulphur dioxide
Ans – ( B )
36.Ozone layer protect us from:
( A ) Infrared rays
( B ) Ultraviolet rays
( C ) White light of sun
( D ) None of these
Ans – ( B )
37. The major causes of air pollution include
( A ) burning of coal and petroleum
( B ) afforestation
( C ) deforestation
( D ) recycling of paper
Ans – ( A )
38.Deforestation leads to an increase in the amount of in the air.
( A ) Carbon monoxide
( B ) Nitrogen dioxide
( C ) Sulphur dioxide
( D ) Carbon dioxide
Ans – ( D )
39. Which of the following is not a greenhouse gas:
( A ) Carbon dioxide
( B ) Sulphur dioxide
( C ) Methane
( D ) Nitrogen
Ans – ( D )
40.Gangotri glacier in the Himabyaslias started melting because of:
( A ) More rain
( B ) Less snow
( C ) Global warming
( D ) None of these
Ans – ( C )
41. Bhopal tragedy was caused due to
( A ) air pollution
( B ) emission of poisonous gas
( C ) water pollution
( D ) leakage of poisonous gas
Ans – ( D )
42.Instead of the fossil fuels for our energy requirements we can use :
( A ) Solar energy
( B ) Hydropower
( C ) Wind energy
( D ) All of these
Ans – ( D )
43. Addition of harmful and poisonous substances in our environment is called:
( A ) Population
( B ) Pollution
( C ) Purification
( D ) None of these
Ans – ( B )
44.Ganga Action Plan was launched in:
( A ) 1985
( B ) 1986
( C ) 1995
( D ) 1958
Ans – ( A )
