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

1. Obtained from a river.

2. Obtained from a lake.

3. Pure and fit for drinking.

4. Used

Answer: C

Question 9:

Which of the following procedures will give you water free from all impurities?

1. Adding chlorine tablets

2. Distillation

3. Boiling

4. Filtration

Answer: B

Question 10:

A pond contains clean water. Which of the following activities will produce least pollution of water?

1. Washing clothes in the pond

2. Animals bathing in the pond

3. Washing motor vehicles in the pond

4. 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

1. Forest Conservation Day

2. Plantation month

3. Van Mahotsav

4. Wildlife week

Answer: C

Question 12:

Which of the following is not a greenhouse gas?

1. Nitrogen gas

2. Water vapour

3. Methane gas

4. 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:

1. Combustion of fuel

2. Industrial activities