Question

- Which of these is not a natural source of energy?
c. electricity
b. petroleum
a. coal
d. sun
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Answer 1

a.Electricity

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Answer 2

The correct option for the source which is not a natural source of energy is c. electricity.

• The energy which is obtained naturally and without any involvement of man is natural.
• Sun is the natural source of energy. energy from the sun is obtained due to nuclear fusion. nuclear fission in sun occurs due to high pressure and temperature which cause electrons to isolate from their nuclei. These nuclei then a fuse to form helium and energy is released.
• Coal is obtained from mines as it is naturally present in the earth so, it is also a natural source of energy.
• Petroleum is also formed from the decomposition of organic remains over 1000 years. so, petroleum is also a natural source of energy.
• Electricity is generated by a man through different techniques which include dams and turbines.