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Physics · PYQ NEET UG 2016(1)

हिन्दी

A gas is compressed isothermally to half its initial volume. The same gas is compressed separately through an adiabatic process until its volume is again reduced to half. Then

  1. Compressing the gas isothermally or adiabatically will require the same amount of work.
  2. Which of the case (whether compression through isothermal or through adiabatic process) requires more work will depend upon the atomicity of the gas.
  3. Compressing the gas isothermally will require more work to be done.
  4. Compressing the gas through adiabatic process will require more work to be done.

Correct answer · Option 4

Compressing the gas through adiabatic process will require more work to be done.

Explanation

In a \( P-V \) diagram, the slope of the adiabatic curve is steeper than that of the isothermal curve (\( \gamma > 1 \)). Therefore, for the same compression to half volume, the area under the adiabatic curve (work done on the gas) is greater than under the isothermal curve.

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