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QPage 77: Q4: HC Verma: Concepts of Physics - Volume 2 Specific Heat Capacities of Gases Page 77: Q4 Solution: Consider the processes A and B shown in the figure. It is…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often label a process as adiabatic just because its $P$–$V$ curve appears steeper than another, forgetting that visual steepness depends on the axes and the value of $gamma$; always verify the governing equation ($PV^{\gamma}=\text{const}$ for adiabatic, $PV=\text{const}$ for isothermal) instead of relying on the picture alone.

Consider the processes A and B shown in the figure. It is possible that

Multiple Choice Options

  • A both the processes are isothermal
  • B both the processes are adiabatic
  • C A is isothermal and B is adiabatic
  • D A is adiabatic and B is isothermal

Step-by-Step Verified Solution

**Answer:** (d) A is adiabatic and B is isothermal. **Step-by-Step Explanation:** From the figure, process A has a steeper slope than process B. Adiabatic processes have steeper slopes than isothermal processes. So A is adiabatic and B is isothermal.

All Questions in this Chapter

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