Lakhmir Singh & Manjit Kaur - Science

Book: Lakhmir Singh & Manjit Kaur - Science

Chapter: 18. Pollution of Air and Water

Subject: Chemistry - Class 8th

Q. No. 25 of Short Answer Type Questions

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25

What-is potable water? Name any two methods to make water safe for drinking.

The water which is safe for drinking without any risk of health problems is called potable water. Water can be made safe for drinking in the following ways:

● Household filters such as candle type filters can be used at homes to make the water safe for drinking.


● Boiling of water can be done before drinking at home. Boiling kills, the germs present in water and makes water safe for drinking.


● Chlorination can also be done for purifying water at home. It can be done by adding chlorine tablets or bleaching powder into water. Only specific number of chlorine tablets should be used.


Chapter Exercises

Very Short Answer Type Questions
Short Answer Type Questions
Long Answer Type Questions
Multiple Choice Questions (MCQs)
Questions Based on High Order Thinking Skills (HOTS)

More Exercise Questions

11

What is Ganga Action Plan? When and why was it launched?
12

Name any four pollutants which cause water pollution. State any three ways of controlling water pollution.
13

How do industries cause water pollution?
14

How can you help reduce air pollution at the individual level?
15

Explain the difference between pure air and polluted air.
16

What is 'greenhouse effect'? State its importance for us.
17

Name two greenhouse gases? Which one of them produces the maximum greenhouse effect?
18

What depletes the ozone layer in the atmosphere? What are the harmful effects of the depletion of ozone layer on us?
19

Name one source and one harmful effect of each of the following air pollutants:

(a) Sulphur dioxide


(b) Nitrogen oxides


(c) Carbon monoxide


(d) Chlorofluorocarbons (CFCs)
20

Explain why, even clear, transparent and odourless water may not always be safe for drinking.
21

Explain why, hot water released by power plants and industries is considered a pollutant.
22

Why does the increased level of nutrients (or fertilizers) in the lake water affect the survival of aquatic organisms (like fish)?
23

Explain how, the use of pesticides in agriculture causes water pollution.
24

Describe the threat to Taj Mahal monument due to air pollution.
24

State any two ways of controlling air pollution;
25

What-is potable water? Name any two methods to make water safe for drinking.
25

State two ways in which you conserve water at home by, preventing its wastage.

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