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QPage 61: Q7: HC Verma: Concepts of Physics - Volume 2 Laws of Thermodynamics Page 61: Q7 Solution: An ideal gas goes from the state i to the state f as shown in…

⚠️ Common Exam Traps & Conceptual Pitfalls

On a P‑V diagram a vertical line indicates constant volume, so the integral $W=int P,dV$ has no $dV$ contribution and $W=0$. Students often confuse the pressure change for work or apply the sign convention for expansion/compression incorrectly, leading them to assign a non‑zero value.

An ideal gas goes from the state i to the state f as shown in figure. The work done by the gas during the process ____________.

Multiple Choice Options

  • A is positive
  • B is negative
  • C is zero
  • D cannot be obtained from this information

Step-by-Step Verified Solution

**Answer:** (c) is zero. **Step-by-Step Explanation:** From the figure, the process is a vertical line on the P-V diagram, meaning constant volume. So W = 0.

All Questions in this Chapter

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