Thermodynamics Question 250
Question: In the P-V diagram, I is the initial state and F is the final state. The gas goes from I to F by (i) IAF, (ii) IBF, (iii) ICE The heat absorbed by the gas is
Options:
A) the same in all three processes
B) the same in (i) and (ii)
C) greater in (i) than in (ii)
D) the-same in (i) and (iii)
Show Answer
Answer:
Correct Answer: C
Solution:
[c] Heat absorbed in a thermodynamic process is given by $ \Delta Q=\Delta U+\Delta W. $
Here $ \Delta U $ is same for all the three processes as it depends only on initial and final states.
But $ \Delta W _{I}=+ve,\Delta W _{II}=0,\Delta W _{III}=-ve $
$ \therefore \Delta Q _{I}>\Delta Q _{II} $
