Assertion (A): Runoff from only paved surfaces is used for storing rainwater.

Reason (R): It is relatively free of bacteriological contamination.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R does not explain A.
3. A is true but R is false.
4. A is false but R is true.

Most of the canals in India belong to which category?

1. Perennial canals
2. Inundation canals
3. Navigation canals
4. None of the above.

Assertion (A): For farmers rainfall is still the most important source of water.

Reason (R): Irrigation canals and tanks have been constructed by rulers since ancient times.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R does not explain A.
3. A is true but R is false.
4. A is false but R is true.

You have to maintain one public park in your colony. Which method of irrigation would you prefer?

1. Furrow irrigation
2. Spray irrigation
3. Drip irrigation
4. Sprinkler irrigation