Question

Write true or false for each statement.

1. Medium is necessary for the transfer of heat by radiation.
2. Solids expand the least and the gases expand the most on being heated.
3. Water is a bad conductor of heat.
4. Land and sea breezes are the convection currents of cold and warm air.
5. Black surfaces are the poor absorbers of heat radiations.

[5 marks]

Answer 1

Medium is not necessary for the transfer of heat by radiation. So, statement 1 is false.

Solids expand the least and the gases expand the most on being heated. So, statement 2 is true.

We also have studied that water is a bad conductor of heat. Thus, statement 3 is also true.

Land and sea breezes are actually local convection currents of cold and warm air. So, statement 4 is correct.

Black surfaces are good absorbers of heat radiations. Thus, statement 5 is false.

(1 mark for each)