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JEE Main Physics Class 11 Thermodynamics Part 1 Questions
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Question : 66
Total: 100
One mole of a diatomic ideal gas undergoes a cyclic process ABC as shown in figure. The process BC is adiabatic. The temperatures at A, B and C are 400 K, 800 K and 600 K respectively. Choose the correct statement:
[2014]
The change in internal energy in whole cyclic process is 250 R.
The change in internal energy in the process CA is 700 R.
The change in internal energy in the process AB is - 350 R.
The change in internal energy in the process BC is – 500 R.
Validate
Solution:
In cyclic process, change in total internal energy is zero.
Δ
U
cyclic
=
0
Δ
U
B
C
=
n
C
v
Δ
T
=
1
×
5
R
2
Δ
T
Where,
C
y
=
molar specific heat at constant volume.
For
B
C
,
Δ
T
=
−
200
K
∴
Δ
U
B
C
=
−
500
R
© examsnet.com
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