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Question-1
We consider a thermodynamic system. If ΔU represents the increase in its internal energy and W the work done by the system, which of the following statements is true?
(A)
ΔU = - W in an adiabatic process
(B)
ΔU = W in an isothermal process
(C)
ΔU = - W in an isothermal process
(D)
ΔU = W in an adiabatic process
Question-2
In thermodynamic processes which of the following statements is not true?
(A)
In an adiabatic process the system is insulated from the surroundings
(B)
In an isochoric process pressure remains constant
(C)
In an isothermal process the temperature remains constant
(D)
In an adiabatic process pV
γ
= constant
Question-3
The temperature of source and sink of a heat engine are 127
o
C and 27
o
C respectively. An inventor claims its efficiency to be 26%, then
(A)
It is impossible
(B)
It is possible with high probability
(C)
It is possible with low probability
(D)
Data are insufficient
Question-4
The efficiency of a Carnot engine operating between temperatures of 100
o
C and -23
o
C will be
(A)
(B)
(C)
(D)
Question-5
If an ideal gas has volume V at 27
o
C and it is heated at a constant pressure so that its volume becomes 1.5 V, then the value of final temperature is
(A)
327 K
(B)
873 K
(C)
177
o
C
(D)
600
o
C
Question-6
In thermal equilibrium, the average velocity of a gas molecule is
(A)
Proportional to T
3
(B)
Proportional to T
2
(C)
Proportional to
(D)
Zero
Question-7
The r.m.s velocity of nitrogen molecules at N.T.P is
(A)
33 m/s
(B)
493 m/s
(C)
517 m/s
(D)
546 m/s
Question-8
540 g of ice at 0
o
C is mixed with 540 g of water at 80
o
C. The final temperature of the mixture is
(A)
40
o
C
(B)
79.9
o
C
(C)
80
o
C
(D)
0
o
C
Question-9
The efficiency of Carnot engine is 50% and temperature of sink is 500 K. If the temperature of source is kept constant and its efficiency is to be raised to 60%, then the required temperature of the sink will be
(A)
600 K
(B)
500 K
(C)
400 K
(D)
100 K
Question-10
The internal energy change in a system that has absorbed 2 k cal of heat and done 500 J of work is
(A)
8900 J
(B)
6400 J
(C)
5400 J
(D)
7900 J
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Plus 1 Computer Science
Tamil Nadu (English Medium)
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