Question

Sources of energy that has been in use since for a long period of time are known as:
a) Renewable
b) Non-renewable
c) Non-conventional
d) Conventional

Answer 1

Hint: To answer the above question we first need to know what does the above sources of energy mentioned among the options mean. First we will define each of the categories of sources of energy. Further we will see which fits the best i.e. which has been in use since for a long period of time and accordingly choose the correct alternative from those provided.

Complete step by step answer:
To begin with let us first define each of the terms in the options.
Conventional sources of energy: These sources of energy are not abundant in nature i.e. their quantity is limited.
Non-conventional sources of energy: These sources of energy are abundant in nature i.e. they are inexhaustible.
The renewable sources of energy can be classified into non-conventional sources of energy as it can be renewed whereas non-renewable sources cannot be renewed and therefore classified in conventional sources of energy. The conventional sources have been used for more than decades now as the non-conventional sources are yet in the development phase.

So, the correct answer is “Option d”.

Note: Some examples of non-conventional sources of energy are solar, wind energy etc. Whereas conventional sources include coal, petroleum, natural gas etc. It is to be noted most of the conventional sources of energy are not environment friendly. Hence we have to ensure the non-conventional sources of energy come into force as soon as possible.