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Question-1
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-2
A vessel contains 1 mole of O
2
gas (molar mass 32) at temperature T. The pressure of the gas is P. An identical vessel containing one mole of He (molar mass 4) at a temperature 2T has a pressure of
(A)
P/8
(B)
P
(C)
8P
(D)
2P
Question-3
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-4
Calorimeters are made of which of the following ?
(A)
Glass
(B)
Metal
(C)
Wood
(D)
Either (1) or (2)
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, 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-6
What is the absolute mass of an atom of oxygen? Atomic mass of oxygen is 16 and Avogadro's number =
(A)
(B)
(C)
(D)
Question-7
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-8
Wien's law states that :
(A)
T + λ
m
= constant
(B)
λ
m
T= constant
(C)
λ
m
/T = constant
(D)
T
4
/ λ
m
= constant
Question-9
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
Question-10
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
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Tamil Nadu (English Medium)
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