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Question-1
An ideal gas is compressed adiabatically to
8
/27 times of its present value at 27
o
C. The temperature of the gas becomes (γ=
5
/3).
(A)
475
o
C
(B)
275
o
C
(C)
402
o
C
(D)
175
o
C
Question-2
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-3
Air is filled at 60
o
C in a vessel with open mouth. The vessel is heated to a temperature T so that 1/4
th
part of air escapes. Assuming the volume of vessel remains constant, the value of T is
(A)
80
o
C
(B)
143
o
C
(C)
333
o
C
(D)
416
o
C
Question-4
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-5
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-6
Heat capacity of a body is infinite. It means
(A)
Heat is given out
(B)
Heat is taken in
(C)
No change in temperature whether heat is taken in or given out
(D)
All of these
Question-7
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-8
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-9
The temperature of an ideal gas is increased from 120 K to 480 K. If at 120 K, the root mean square velocity of gas molecules is v, at 480 K it becomes
(A)
4 v
(B)
2 v
(C)
v/2
(D)
v/4
Question-10
In an adiabatic process, the quantity which remains constant is
(A)
Volume
(B)
Pressure
(C)
Temperature
(D)
Total heat of the system
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Plus 1 Biology Science
Tamil Nadu (English Medium)
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