Question

For an isolated system, q is zero. In an isolated system, change in U and V is zero.

• 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: (B)

If both assertion and reason are true but reason is not the correct explanation of assertion.

Answer 2

For an isolated system, $W=q=0$ $\Delta U=q +W$ Hence, $\Delta U=0$ $W=P \Delta V$ as $W=0$ so, $\Delta V=0$