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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
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-3
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-4
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-5
The equation of state for 5g of oxygen at a pressure p and temperature T, when occupying a volume V, will be
(A)
pV = (
5
/32)RT
(B)
pV = 5 RT
(C)
pV = (
5
/2)RT
(D)
pV = (
5
/16)RT
Question-6
R.M.S velocity of a molecule is C at pressure P. If pressure is increased two times, then r.m.s velocity becomes
(A)
0.5 C
(B)
C
(C)
2 C
(D)
3 C
Question-7
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-8
The efficiency of a Carnot engine operating between temperatures of 100
o
C and -23
o
C will be
(A)
(B)
(C)
(D)
Question-9
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, VA = 2 × 10
-3
m
3
PB = 8 × 10
4
Pa, VB = 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-10
A black body radiates heat energy at the rate of 2 × 10
5
J/s/m
2
at a temperature of 127°C. The temperature of black body at which the rate of radiation is 32 × 10
5
J/s/m
2
is
(A)
273°C
(B)
527°C
(C)
873°C
(D)
927°C
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Plus 1 Computer Science
Tamil Nadu (English Medium)
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