Heat and Thermodynamics 5 Question 34
35. One mole of a monoatomic ideal gas undergoes a cyclic process as shown in the figure (where, $V$ is the volume and $T$ is the temperature). Which of the statements below is (are) true?
(2018 Adv.)
(a) Process I is an isochoric process
(b) In process II, gas absorbs heat
(c) In process IV, gas releases heat
(d) Processes I and III are not isobaric
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Answer:
Correct Answer: 35. (b,c,d)
Solution:
- Process-II is isothermal expansion,
$$ \begin{gathered} \Delta U=0, W>0 \\ \Delta Q=W>0 \end{gathered} $$
Process-IV is isothermal compression,
$$ \begin{aligned} & \Delta U=0, W<0 \\ & \Delta Q=W<0 \end{aligned} $$
Process-I and III are not isobaric because in isobaric process $T \propto V$ hence, $T$ - $V$ graph should be a straight line passing through origin.
Option b, c and d are true.
