Q101 / 180 · AIIMS 2016 · Physics

Assertion : In an adiabatic process, change in internal energy of a gas is equal to work done on or by the gas in the process. Reason : Temperature of gas remains constant in an adiabatic process.

  • A
    If both assertion and reason are true and reason is the correct explanation of assertion.
  • B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
  • Correct answer
    C
    If assertion is true but reason is false.
  • D
    If both assertion and reason are false.

Solution

Assertion is true but reason is false. In an adiabatic process, no exchange of heat is permissible i.e., $d Q=0$. As, $d Q=d U+d W=0 . \quad \therefore d U=-d W$.

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

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