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KVPY SX SB Exam 2018 Question Paper
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© examsnet.com
Question : 24
Total: 120
An ideal gas undergoes change in its state from the initial state I to the final state F via two possible paths asshown. Then
there is no change in internal energy along path 1
heat is not absorbed by the gas in both paths
the temperature of the gas first increases and then decreases for path 2
work done by the gas is larger in path 1
Validate
Solution:
PV = nRT
P
∆
V
+
V
∆
P
=
N
R
∆
T
∆
P
∆
V
=
P
n
R
+
V
n
R
∆
P
∆
V
∆
P
∆
V
is positive for 1
st
half & negative for
2
n
d
half have temperature 1st increases then decreases.
© examsnet.com
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