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Which of the following is not a solid fuel?

Which of the following is not a solid fuel? Correct Answer Petroleum

A fuel is a substance that is capable of creating heat energy which can be put to industrial use. Fuels are classified into three groups depending on the state in which they occur. These are solid fuels, liquid fuels and gaseous fuels. Charcoal, coke and coal are examples of solid fuels while petroleum is a liquid fuel.

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3. Fuel cells produce electricity in the form of Alternating Current (AC).
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