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QPage 61: Q5: HC Verma: Concepts of Physics - Volume 2 Laws of Thermodynamics Page 61: Q5 Solution: Consider the process on a system shown in figure. During the…

⚠️ Common Exam Traps & Conceptual Pitfalls

On a PV diagram work done by the system is the area under the curve, i.e. $W=int P,dV$. Even if the pressure decreases along the path, the integral over a larger volume still grows, so the work done by the system continuously increases. Do not equate a downward slope with a reduction in work.

Consider the process on a system shown in figure. During the process, the work done by the system ____________.

Multiple Choice Options

  • A continuously increases
  • B continuously decreases
  • C first increases then decreases
  • D first decreases then increases

Step-by-Step Verified Solution

**Answer:** (a) continuously increases. **Step-by-Step Explanation:** From the figure, as the process goes from left to right, the area under the curve increases continuously.

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