Question

Those which 'produce heat on combustion' are called:

• A. Engine
• B. Fuel
• C. Heater
• D. None of these

Hint:

Petrol, diesel, coal, LPG are common fuels that release energy when burned.

Answer 1

The Correct Option is B

Step 1: Definition.
A fuel is any substance that produces heat and energy on combustion.
Step 2: Explanation of options.
- Engine uses fuel but is not itself fuel.
- Heater is a device, not a substance.
- Fuel like coal, petrol, LPG gives heat on burning.
Step 3: Conclusion.
Therefore, substances producing heat on combustion are called fuels.