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CGPET 2016 Solved Paper
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© examsnet.com
Question : 33
Total: 150
A solid body of constant heat capacity 1 J/°C is being heated by keeping it in contact with reservoirs in two ways
(i) Sequentially keeping in contact with2 reservoirs such that each reservoir supplies same amount of heat
(ii) Sequentially keeping in contact with 8 reservoirs such that each reservoir supplies same amount of heat
In both the cases, body is brought from initialtemperature 100° C to final temperature 200° C.Entropy change of the body in two casesrespectively is
In 2, In 2
2 8 In 2, In 2
In 2, In 2
In 2, In 2
Validate
Solution:
Change in entropy due to condition is
∆
S
=
C
log
T
2
T
1
C= Heat capacity
Now,
C
=
N
1
J
∕
°
C
T
2
=
200
°
C
T
1
=
100
°
C
In case I
∆
S
1
=
1
×
2
×
log
200
100
=
2
log
2
In case II
∆
S
2
=
1
×
8
×
log
200
100
=
8
log
2
In first case, number of reservoir is 2.
In second case, number of reservoir is 8.
© examsnet.com
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