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Question-1
First law of thermodynamics is a consequence of conservation of
(A)
Work
(B)
Energy
(C)
Heat
(D)
All of these
Question-2
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-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
The number of degrees of freedom for molecules of a mono atomic gas is
(A)
3
(B)
4
(C)
5
(D)
6
Question-5
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-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
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-8
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-9
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-10
An ideal gas undergoing adiabatic change has the following pressure-temperature relationship
(A)
p
γ-1
T
γ
= constant
(B)
p
γ
T
γ-1
= constant
(C)
p
γ
T
1-γ
= constant
(D)
p
1-γ
T
γ
= constant
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Plus 1 Biology Science
Tamil Nadu (English Medium)
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