Verified Solution • 2025–26 Session moderate

QPage 61: Q2: HC Verma: Concepts of Physics - Volume 2 Laws of Thermodynamics Page 61: Q2 Solution: If heat is supplied to an ideal gas in an isothermal process,…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often assume that adding heat must raise the internal energy, but for an ideal gas $\Delta U$ depends only on temperature; in an isothermal process $\Delta T=0$ so $\Delta U=0$. The supplied heat $Q>0$ therefore appears entirely as work $W$, and with the convention that work done by the system is positive, the gas does positive work.

If heat is supplied to an ideal gas in an isothermal process, ____________.

Multiple Choice Options

  • A the internal energy of the gas will increase
  • B the gas will do positive work
  • C the gas will do negative work
  • D the said process is not possible

Step-by-Step Verified Solution

**Answer:** (b) the gas will do positive work. **Step-by-Step Explanation:** In an isothermal process, _U = 0. Q = W. If heat is supplied (Q > 0), work done is positive.

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