K K Gupta and Stalin Malhotra Solutions for Chapter: Heat, Exercise 2: Let's revise

Room heaters work on the principle of _____.

Temperature is the cause of heat.

Hotter body transfers heat to a cooler body.

Places near the sea receive sea breeze during daytime.

Heat cannot travel without a medium.

Air is a good conductor of heat.

Heat conduction is the flow of internal energy from a region of higher temperature to one of lower temperature by the interaction of adjacent particles in the intervening space. It varies with the type of material. For example, greatest for metallic solids, lower for non-metallic solids, very low for liquids and extremely low for gases. Silver is the best metallic conductor. On the other hand, materials that are poor conductors of heat are insulators. Air is an awesome insulator when locked in an enclosed space.
Answer the following question by choosing the correct option given below by reading the given passage.

Conduction is maximum in :

Heat conduction is the flow of internal energy from a region of higher temperature to one of lower temperature by the interaction of adjacent particles in the intervening space. It varies with the type of material. For example, greatest for metallic solids, lower for non-metallic solids, very low for liquids and extremely low for gases. Silver is the best metallic conductor. On the other hand, materials that are poor conductors of heat are insulators. Air is an awesome insulator when locked in an enclosed space.
Answer the following question by choosing the correct option given below by reading the given passage.

The best conductor is :