Question

Two bodies X and Y are in thermal equilibrium. Body Y is also at the same temperature as a third body Z. The three bodies are of different materials and have different masses. Which statement must be correct?

• A. X and Y must have the same heat capacity
• B. Y and Z have the same internal energy
• C. There is no net transfer of energy if X is placed in thermal contact with Z
• D. It is not necessary that Y should be in thermal equilibrium with Z

Answer 1

Answer: (C)

There is no net transfer of energy if X is placed in thermal contact with Z

$Answer:-$ C

Thsi argument you can prove using the zeroth law of thermodynamics which states that if two thermodynamic system are each in thermal equillibrium with a third, then they are in thermal equilibrium with each other.