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Question-1
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-2
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-3
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-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
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-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
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-8
Calorimeters are made of which of the following ?
(A)
Glass
(B)
Metal
(C)
Wood
(D)
Either (1) or (2)
Question-9
The efficiency of a Carnot engine operating between temperatures of 100
o
C and -23
o
C will be
(A)
(B)
(C)
(D)
Question-10
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
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Plus 1 Computer Science
Tamil Nadu (English Medium)
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