The ultimate source of energy is —

1. wood
2. wind
3. water
4. sun

A natural source providing us energy continuously is called -

1. non-renewable
2. conventional
3. renewable
4. none of the above

The energy obtained from the sun is called -

1. solar
2. renewable
3. non-renewable
4. both (a) and (b)

The correct renewable sources of energy are :

(i) Biomass

(ii) Nuclear fuel

(iii) Coal

(iv) Petroleum

1. (i)
2. (iii)
3. (ii) and (iv)
4. (i) and (ii)