Which of the following is/are is a conventional source of energy?
i.Coal
ii.Biogas
iii.Petroleum
iv.Tidal energy
Ai only
Bii only
Ci and iii only
Dii and iv only
Which of the following is/are is a conventional source of energy?
i.Coal
ii.Biogas
iii.Petroleum
iv.Tidal energy
Ai only
Bii only
Ci and iii only
Dii and iv only
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