Rains and Irrigation Practices

Q. "Khadins" are used in Rajasthan to__________.

1. check soil erosion
2. recharge ground water
3. promote soil erosion
4. trap wild animals

Q. Question 23
Select the eco-friendly activity among the following
(a) Using car for transportation
(b) Using poly bags for shopping
(c) Using dyes for colouring clothes
(d) Using windmills to generate power for irrigation

Q. Select the most appropriate option for the pH range of acids and bases.

1. Base: 0 - 5 and Acid: 6 - 14
2. Acid: 0 - 7 and Base: 7 - 14
3. Acid: 0 - 5 and Base: 5 - 14
4. Base: 0 - 7 and Acid: 7 - 14

Q. List any four advantages of water harvesting. [3 MARKS]

Q. What is the most suitable pH range for fresh water plants and animals?

1. 6.5 - 7.5
2. 2.0 - 3.5
3. 3.5 - 5.0
4. 9.0 - 10.5