Assertion (A): Solar energy is practically free.

Reason (R): Solar energy systems do not require a lot of maintenance.

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.

Wind farms are rare in

1. coastal regions
2. open grasslands
3. hilly regions
4. river valleys.

Tidal energy can be harnessed at …………… .

1. Gulf of Kutch
2. Sundarbans
3. Andaman and Nicobar Islands
4. All of the above.

Geothermal energy is environment friendly.

1. It has low emission of green house gases.
2. It is independent of weather and season.
3. It is easily accessible.
4. It is independent of exchange rates.