53rd to 55th B.P.S.C. (Pre) 2011
Commercial sources of energy purely consist of-
aPower, coal, oil, gas, hydro-electricity and uranium✓ Correct
bCoal, oil, firewood, vegetable waste and agricultural waste
cPower, coal, animal dung and firewood
dCoal, gas, oil and firewood
Explanation
Among the commercial sources of energy, strictly included are electricity, coal, oil, gas, hydroelectric power and uranium.
general-geography