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Answer :
(a) The source of energy that replenishes in nature is known as renewable
source of energy. Sun, wind, moving water, bio-mass, etc. are some of the examples
of renewable sources of energy.
The source of energy that does not replenish in nature is known as non-renewable
source of energy. Coal, petroleum, natural gas, etc. are some of the examples of
non-renewable sources of energy.
(b) Exhaustible sources are those sources of energy, which will deplete and exhaust
after a few hundred years. Coal, petroleum, etc. are the exhaustible sources of
energy.
Inexhaustible resources of energy are those sources, which will not exhaust in
future. These are unlimited. Bio-mass is one of the inexhaustible sources of energy.