Question

Which among the following is not a fact?

• A. Metals expand on heating
• B. Boiling point of water is 100 degree centigrade
• C. Sodium is an alkali metal
• D. Unit of Energy is Joule

Answer 1

Answer:

A. Metals expand on heating

Thermal expansion is the tendency of matter to change in volume in response to a change in temperature. For most substances, including metals, when they are heated, their constituent atoms or molecules vibrate more vigorously and move further apart from each other. This increased atomic vibration and separation leads to an increase in the overall volume of the material.