Thermodynamics Ques 50

50. $110$ joules of heat is added to a gaseous system whose internal energy is $40$ $ J$. Then the amount of external work done is

[1993]

(a) $150 $ $J$

(b) $70 $ $J$

(c) $110 $ $J$

(d) $40 $ $J$

Show Answer

Answer:

Correct Answer: 50.(b)

Solution:

  1. (b) $\Delta Q=\Delta U+\Delta W$

$\Rightarrow \Delta W=\Delta Q-\Delta U=110-40=70 $ $J$



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