RE-NEET Physics Thermal Properties of Matter Class 11 Questions

The temperature of a metallic sphere of radius R is increased by a small amount ΔT. If the linear coefficient of thermal expansion of the metal is α, the approximate increase in the volume of the sphere is:

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Houses made of concrete roofs overlaid with foam keep the room hotter during summer.

Reason R: The layer of foam insulation prohibits heat transfer, as it contains air pockets.

In the light of the above statements, choose the correct answer from the options given below.

Water is used as a coolant in a nuclear reactor because of its