Question:

Consider the graph for cyclic process. The isothermal compression process among them is:

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In PV graph: curved path + decreasing volume \(\Rightarrow\) isothermal compression.
Updated On: Apr 14, 2026
  • I
  • II
  • III
  • IV
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The Correct Option is C

Solution and Explanation

Concept:
•Isothermal process: \(PV = \text{constant}\) → rectangular hyperbola
•Compression: volume decreases (motion from right to left)

Step 1: Identify isothermal curve
In a \(PV\) graph, isothermal process is represented by a curved (hyperbolic) path.

Step 2: Check direction
Compression means volume decreases, so the path must move from right to left.

Step 3: Analyze given processes

•Process III: curved path with decreasing volume → isothermal compression
•Other processes represent expansion or different thermodynamic paths Conclusion \[ \text{Isothermal compression corresponds to process III} \]
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