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.

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.

Assertion (A): Wind power accounts for nearly 10 percent of India's total installed power generation capacity.

Reason (R): Wind Mills can be installed in most regions — coastal regions, open grasslands or hilly regions.

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.