Q141 / 180 · JIPMER 2016 · Physics

The volume of an ideal gas is doubled in an isothermal process. Then, which of the following is true?

  • Correct answer
    A
    Work done by the gas is positive
  • B
    Work done by the gas is negative
  • C
    Internal energy of the system decreases
  • D
    Internal energy of the system increases

Solution

For isothermal process, $d U=0$ $\begin{aligned} & \text { Work done }=d W=p\left(V_2-V_1\right) \\ & \therefore \quad d W=+p V \quad\left[\because V_2=2 V_1=2 V\right] \\ & \end{aligned}$

Hence, the correct answer is option: 'A'.

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