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Question-1
A gas at a temperature of 250 K is contained in a closed vessel. If the gas is heated through 1 K, then percentage increase in its pressure is
(A)
0.1 %
(B)
0.2 %
(C)
0.3 %
(D)
0.4 %
Question-2
An electric fan is switched on in a closed room. The air in the room
(A)
Is cooled
(B)
Is heated
(C)
Maintains its temperature
(D)
Is heated or cooled depending upon atmosphere pressure
Question-3
A container has N molecules at absolute temperature T. If the number of molecules is doubled but kinetic energy in the box remains the same, the absolute temperature of the gas is
(A)
T
(B)
2T
(C)
T
/2
(D)
Zero
Question-4
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-5
A scientist says that the efficiency of his heat engine which works at source temperature of 127
o
C and sink temperature 27
o
C is 26%.
(A)
It is impossible
(B)
It is possible but less probable
(C)
It is quite possible
(D)
Data is incomplete
Question-6
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-7
Initial pressure and volume of a gas are P and V respectively. First the gas is expanded isothermally to 4V and then its volume is made V by adiabatic process. Its final pressure (γ = 1.5) is
(A)
8 P
(B)
4 P
(C)
P
(D)
2 P
Question-8
A thermodynamic process is shown in the figure. The pressure and volumes corresponding to some points in the figure are
P
A
= 3 × 10
4
Pa, V
A
= 2 × 10
-3
m
3
P
B
= 8 × 10
4
Pa, V
B
= 5 × 10
-3
m
3
In process AB, 600 J of heat is added to the system and in process BC, 200 J of heat is added to the system. The change in internal energy of the system in process AC would be
(A)
800 J
(B)
560 J
(C)
600 J
(D)
640 J
Question-9
The volume of a liquid is 830 m
3
at 30
o
C and it is 850 m
3
at 90
o
C. The coefficient of volume expansion of the liquid is
(A)
(B)
(C)
(D)
Question-10
The number of degrees of freedom for molecules of a mono atomic gas is
(A)
3
(B)
4
(C)
5
(D)
6
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Plus 1 Biology Science
Tamil Nadu (English Medium)
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