Question

On cooling down a substance, there is a loss of heat and their kinetic energy ___________.

Answer 1

1. Cooling results in the loss of heat from a substance, so as a result kinetic energy is reduced.
2. When temperature increases, the heat supplied is absorbed by the substance constituent particles and which in turn results in the increase of kinetic energy of the particles.

Hence, on cooling down a substance, there is a loss of heat and their kinetic energy decreases.