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JIPMER 2016
Exam
JIPMER
Year
2016
Subject
Physics
Chapter
Thermodynamics

JIPMER 2016 · Physics · Thermodynamics

The volume of an ideal gas is doubled in an isothermal process....

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

Options

  1. AWork done by the gas is positive
  2. BWork done by the gas is negative
  3. CInternal energy of the system decreases
  4. DInternal energy of the system increases

Correct answer

A. Work done by the gas is positive

Step-by-step solution

For isothermal process, dU=0d U=0 Work done =dW=p(V2−V1)∴dW=+pV[∵V2=2V1=2V]\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}$$
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