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Question-1
The kinetic energy of one gm - molecule of a gas at normal temperature and pressure is (R = 8.31 J mol
-1
K
-1
)
(A)
0.56 x 10
4
J
(B)
1.3 x 10
2
J
(C)
2.7 x 10
3
J
(D)
3.4 x 10
3
J
Question-2
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-3
At what temperature is the r.m.s. speed of molecules of hydrogen twice that at S.T.P. ?
(A)
273 K
(B)
546 K
(C)
819 K
(D)
1092 K
Question-4
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-5
In an adiabatic process, the quantity which remains constant is
(A)
Volume
(B)
Pressure
(C)
Temperature
(D)
Total heat of the system
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
110 J of heat is added to a gaseous system, whose internal energy is 40 J, then the amount of external work done is
(A)
150 J
(B)
70 J
(C)
110 J
(D)
40 J
Question-8
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-9
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-10
If the temperature of the sun is doubled, the rate of energy received on earth will be increased by a factor of
(A)
2
(B)
4
(C)
8
(D)
16
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Plus 1 Computer Science
Tamil Nadu (English Medium)
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