Name the fuel that provides most of the energy needs of the world.

Mention any four areas where solar cells are being used as a source of energy.

The energy liberated by burning $1 \,g$ of charcoal is approximately: (in $,kJ$)

$(i)$ Distinguish between renewable and non-renewable sources of energy,giving one example of each.
$(ii)$ Why is the use of wood as a fuel not advised,although forests can be replenished?

Mention any one reason due to which most of the thermal power plants are set up near coal or oil fields.

Which of the following sources of energy is different from the other?