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Question

Which of the following is not a commercial source of energy?

This question was previously asked in
SSC CGL 2016 (Tier 1) Previous Year Question Paper (11-Sep-2016) (Shift 2)
The correct answer is

Firewood

Coal, petroleum, and natural gas are all fossil fuels, extracted and processed for commercial use. They are bought and sold on energy markets. Firewood, on the other hand, is typically gathered or harvested for personal use or small-scale, non-commercial applications. While it can be a source of energy, it's not generally considered a commercial energy source in the same way as the others.

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