Question

Automobile engines work on the principle of:

• A. thermal expansion of liquids
• B. thermal expansion of solids
• C. anomalous expansion
• D. thermal expansion of gases

Answer 1

The correct option is D thermal expansion of gases

Thermal expansion involves change in volume of an object when it is heated. The combustion of fuel in an automobile engine produces gas at high pressure. That pressurized gas is expanded in a chamber to drive a piston which in turn rotates the crank. Thus automobile engines work on the principle of thermal expansion of gas.