A cyclic process ABCD is shown in the P-V diagram for an ideal gas. Which of the following diagrams represents the same process?

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Solution

The correct option is C
$A \to B : I s o b a r i c ∴ \frac{V}{T} = c o n s t a n t .$
$∴ V v s T$ must be a straight line through the origin. Also, since V increases, T must increase.

$B \to C :$ Looks like an isothermal process. So a straight line parallel to the y axis and going upwards (as, V is increasing.)

$C \to D :$ Isochoric with decrease in P and T. Hence straightline parallel to x - axis.

$D \to A :$ Again isothermal and hence parallel to y - axis.

Hence, [C].

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