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11. thermodynamics — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics11. thermodynamics1 Mark
MCQ
Heat is given to an ideal gas in an isothermal process.

$A.$ Internal energy of the gas will decrease.

$B.$ Internal energy of the gas will increase.

$C.$ Internal energy of the gas will not change.

$D.$ The gas will do positive work.

$E.$ The gas will do negative work.

Choose the correct answer from the options given below :

  • A
    $A$ and $E$ only
  • B
    $B$ and $D$ only
  • C
    $B$ and $D$ only
  • ✓
    $C$ and $D$ only
✓

Answer

Correct option: D.
$C$ and $D$ only
d
$dQ = dU + dW \Rightarrow dU = nC _{ V } dT$

$dU =0 \quad \text { (for isothermal) }$

$U =\text { constant }$

$Also dQ > 0 \quad \text { (supplied) }$

Hence,$dW > 0$

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