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AP EAMCET Engineering 21 Sep 2020 Shift 1 Paper
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© examsnet.com
Question : 101
Total: 160
A gas is compressed from a volume of
2
m
3
to a volume of
1
m
3
at a constant pressure of
100
N
m
−
2
. Then it is heated at constant volume by supplying
150
J
of energy. As a result, the internal energy of the gas _________
increases by
250
J
decreases by
250
J
decreases by
50
J
increases by
50
J
Validate
Solution:
Since, gas is compressed from
2
m
3
to
1
m
3
.
Hence, work done on the gas is negative.
W
=
−
p
∆
V
=
−
100
(
2
−
1
)
=
−
100
J
Since, heat supplied,
Q
=
150
J
Hence, according to first law of thermodynamics,
Q
=
W
+
∆
U
150
=
−
100
+
∆
U
⇒
∆
U
=
150
+
100
=
250
J
© examsnet.com
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