CBSE Class 10 Science 2018 · Paper 31(B)/C · Question 4
List two energy sources that you would consider to be renewable. Give reasons for your choice.
Answer
Solar and wind energy are renewable: the Sun keeps radiating and winds are caused by its daily heating.
(i) Solar energy: the Sun will keep radiating energy at its present rate for about 5 billion years more, so sunlight reaches the Earth every day and using it does not use up the source.
(ii) Wind energy: winds are caused by the uneven heating of land and water bodies by the Sun, which goes on every day, so the wind is replenished by nature and will not run out.
Other correct choices, with the same kind of reason, also earn the marks: the energy of flowing water (renewed by the water cycle) or biomass (which can be grown again).
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