Three different processes that can occur in an ideal monoatomic gas… | JEE Main 2020 (5 Sep, Shift 1)

Q57JEE Main 2020 · 5 SEP · SHIFT 1Medium

P-V Diagrams & Cyclic Processes

Three different processes that can occur in an ideal monoatomic gas are shown in the P vs V diagram. The paths are labelled as A $\rightarrow$ B, A $\rightarrow$ C and A $\rightarrow$ D. The change in internal energies during these process are taken as EAB, EAC and EAD and the work done as WAB, WAC and WAD. The correct relation between these parameters are:

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Answer: (b)

B, C and D all lie on the same isotherm $T_1$ , and $U$ of an ideal gas depends only on $T$ , so $E_{AB} = E_{AC} = E_{AD}$ .
A to B: volume increases, so $W_{AB} > 0$ .
A to C: volume constant, so $W_{AC} = 0$ .
A to D: volume decreases, so $W_{AD} < 0$ .
So the answer is (b).

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P-V Diagrams & Cyclic Processes question from JEE Main 2020 (5 Sep, Shift 1)

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