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Potable Water and Water Pollution

1.	Potable water
2.	Water purification
3.	Hardness of Water
4.	Removal of hardness of Water
5.	Water pollution & Water resources in Tamil Nadu
6.	Sources of water pollution-I
7.	Sources of water pollution-II
8.	Common pollutant
9.	Controlling Water pollution

1.	Hardness of water: Match the following Difficulty: easy	3
2.	Hardness of water: Choose the correct answer Difficulty: easy	2
3.	Potable water: True or false Difficulty: medium	3
4.	Water purification & Hardness of water: True or false Difficulty: medium	3
5.	Purification of water: Choose the correct answer Difficulty: medium	3
6.	Potable water: Fill in the blanks Difficulty: medium	3
7.	Water purification and hardness of water: Think and answer Difficulty: medium	2
8.	Hardness of water: think and select the answer Difficulty: hard	4

1.

Training Test

Difficulty: medium

10

1.

Methodical recommendation

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