NCERT Class VIII Science Solutions: Chapter 18-Pollution of Air and Water Part 2
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Question 8:
Potable water is the water which is
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Obtained from a river.
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Obtained from a lake.
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Pure and fit for drinking.
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Used
Answer: C
Question 9:
Which of the following procedures will give you water free from all impurities?
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Adding chlorine tablets
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Distillation
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Boiling
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Filtration
Answer: B
Question 10:
A pond contains clean water. Which of the following activities will produce least pollution of water?
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Washing clothes in the pond
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Animals bathing in the pond
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Washing motor vehicles in the pond
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Swimming in the pond.
Answer: D
Question 11:
Trees help in reducing the pollution of our environment. Lakhs of trees are planted by people in the month of July every year.
The occasion is called
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Forest Conservation Day
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Plantation month
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Van Mahotsav
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Wildlife week
Answer: C

Image of Fact About Van Mahotsav
Image of fact about van mahotsav
Question 12:
Which of the following is not a greenhouse gas?
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Nitrogen gas
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Water vapour
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Methane gas
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Carbon dioxide
Answer: A
VERY SHORT ANSWER QUESTIONS
Question 13:
Name the chemicals which are used in refrigerators and air conditioners and damage ozone layer when released in air.
Answer:
Chlorofluorocarbons
Question 14:
Name any two sources which cause air pollution due to suspended particulate matter.
Answer:
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Combustion of fuel
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Industrial activities

Image of Sources of Air Pollution
Image of sources of air pollution