Water

Q. What is the pH range for an acid substance?

1. 1 - 7
2. 7 - 14
3. 1 - 6
4. 0 - 7

Q.

Water is a basic necessity for all terrestrial forms of life.

1. False

2. True

Q.

A village is situated at the banks of a river. A factory that is located before the village dumps its waste in the river. One day, Ram a resident of the village uses a pH paper to test the water. He sees a dark red shade of colour on the paper. This shows that the water is ___.

1. basic

2. neutral

3. None of the above

4. acidic

Q. Regions of water scarcity are closely correlated to the regions of acute poverty.

1. False
2. True

Q.

The pH range most conducive for life of freshwater plants and animals is

1. 6.5-7.5

2. 2.0-3.5

3. 3.5-5.0

4. 9.0–10.5

Q.

What is the purpose pH scale?

Q.

Match the following column and choose the correct option.

Column A	Column B
1. Rajasthan	a. Ahars and pynes
2. Bihar	b. Khains, tanks and nadi
3. Tamil Nadu	c. Surangams
4. Kerala	d. Eris

1. 1-b 2-a 3-d 4-c

2. 1-c 2-b 3-d 4-a

3. 1-b 2-a 3-c 4-d

4. 1-a 2-b 3-d 4-c