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KVPY SX SB Exam 2018 Question Paper
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© examsnet.com
Question : 25
Total: 120
A thermally insulated rigid container of one litre volume contains a diatomic ideal gas at room temperature. A small paddle installed inside the container is rotated from the outside such that the pressure rises by 10
5
Pa. The change in internal energy is close to
0 J
67 J
150 J
250 J
Validate
Solution:
∆
U
=
n
C
v
(
T
2
−
T
1
)
=
n
R
γ
−
1
[
P
2
V
n
R
−
P
1
V
n
R
]
=
(
P
2
−
P
1
)
V
γ
−
1
=
(
2
×
10
5
−
1
×
10
5
)
×
10
−
3
7
5
−
1
5
2
×
100
=
250
J
© examsnet.com
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