Question

1000 cal of heat energy is supplied to a body 'X' and 2000 cal of heat energy is supplied to body 'Y' and they are kept in contact. Then

• A. the heat energy flows from Y to X
• B. the heat energy flows from X to Y
• C. the heat energy may flow from X to Y or Y to X depending upon their specific heat capacity
• D. the heat energy may flow from X to Y or Y to X depending upon their temperature.

Answer 1

The correct option is D

the heat energy may flow from X to Y or Y to X depending upon their

temperature.

The explanation for the correct answer-

Option D

1. Heat is a form of energy. when heat is supplied to a body its temperature rises.
2. So when heat is applied to bodies X and Y they get heated and their temperature rises. The temperature they acquire depends on their specific heat and the previous state they were in which is not given in the question.
3. Now we know heat flows from higher to lower temperatures.
4. so the flow of heat depends on the temperature of the bodies.

The explanation for the incorrect answers-

Option A

1. Heat flows from Y to X only if Y has a higher temperature than X.
2. But the temperatures the body will acquire are unclear from the given information.
3. Therefore option is incorrect.

Option B

1. Heat flows from X to Y only if X has a higher temperature than Y.
2. But as mentioned before the temperatures the body will acquire are unclear from the given information.
3. Therefore this option is also incorrect.

Option C

1. The flow of energy from one body to other does not depend upon the specific heat capacities of the body.
2. Heat just flows from higher temperatures to lower.

Thus option (d) is correct.