Question

Choose the correct statement for an isolated system.

• A. $\Delta U ( C \rightarrow D )=$ negative
• B. $\Delta Q ( A \rightarrow B )=$ positive
• C. $\Delta U(A-B-C-D-A) \neq 0$
• D. $\Delta Q ( D \longrightarrow A )=0$

Answer 1

Answer: (D)

In an isolated system no heat is exhanged between system and surrounding during process.
Here as system is isolated $\Delta Q = 0$, for any part of system in graph.
Question from $p-V$ curve are very important from examination point of view, conceptual clearity is necessary to tackle. These problems a problem which seem difficult may involve a basic concept with which it can be solved easily. Work dine in $p-V$ curve, change in internal energy etc., are common questions which are asked in examination.