Question

______ sources of energy are generally exhaustible, ______ sources are generally renewable.

• A. Noncommercial, commercial
• B. Commercial, noncommercial
• C. Conventional, non conventional
• D. Non conventional, conventional

Answer 1

Answer: (B)

Commercial, noncommercial

Commercial sources are exhaustible like coal, petroleum and electricity are considered as the conventional source of energy. As these are the natural components which are there in the nature in little amount and can't be used again and again. These are only be used for once.

Other side, firewood, cow dung are non-commercial as they're are free of cost available with no limitations.

Hence, B is the correct option.