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Question-1
The internal energy change in a system that has absorbed 2 k cal of heat and done 500 J of work is
(A)
8900 J
(B)
6400 J
(C)
5400 J
(D)
7900 J
Question-2
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-3
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-4
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-5
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-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
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-8
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-9
A scientist says that the efficiency of his heat engine which works at source temperature of 127
o
C and sink temperature 27
o
C is 26%.
(A)
It is impossible
(B)
It is possible but less probable
(C)
It is quite possible
(D)
Data is incomplete
Question-10
Water falls from a height of 500 m. What is the rise in temperature of water at the bottom if the whole energy is used up in heating water ?
(A)
0.96
o
C
(B)
1.02
o
C
(C)
1.16
o
C
(D)
0.25
o
C
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Plus 1 Biology Science
Tamil Nadu (English Medium)
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