Q. Choose the correct statement for an isolated system.

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A

$Δ \text{U} \left(\text{C} → \text{D}\right) =$ negative

B

$Δ \text{Q} \left(\text{A} → \text{B}\right) =$ positive

C

$Δ \text{U} \left(\text{A} - \text{B} - \text{C} - \text{D} - \text{A}\right) ≠ 0$

D

$Δ \text{Q} \left(\text{D} ⟶ \text{A}\right) = 0$

Solution:

In an isolated system no heat is exhanged between system and surrounding during process.
Here as system is isolated ΔQ = 0, for any part of system in graph.
Question from p-V curve are very importent 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.

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