The energy which flows from a hot body to a cold body is called

1. mechanical energy
2. fuel energy
3. solar energy
4. heat energy

…………… determines the direction of flow of heat.

1. Heat
2. Temperature
3. Coldness
4. None of these

The amount of heat energy contained by a body depends on :

1. the mass of the body
2. the temperature of the body
3. the nature of the material of the body
4. all of the above