Question

Assertion: In an adiabatic process, change in internal energy of a gas is equal to work done on or by the gas in the process.
Reason: Temperature of gas remains constant in an adiabatic process.

• A. If both assertion and reason are true and reason is the correct explanation of assertion.
• B. If both assertion and reason are true but reason is not the correct explanation of assertion.
• C. If assertion is true but reason is false.
• D. If both assertion and reason are false.

Answer 1

Answer: (C)

Assertion is true but reason is false.
In an adiabatic process, no exchange of heat is
permissible i.e., dQ = 0.
As, dQ = dU + dW = 0. ∴ dU = - dW.