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Question-1
A container has N molecules at absolute temperature T. If the number of molecules is doubled but kinetic energy in the box remains the same, the absolute temperature of the gas is
(A)
T
(B)
2T
(C)
T
/2
(D)
Zero
Question-2
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-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
A Carnot engine whose sink is at 300 K has an efficiency of 40%. By how much should the temperature of source be increased so as to increase its efficiency by 50% of original efficiency?
(A)
275 K
(B)
325 K
(C)
250 K
(D)
380 K
Question-5
Calorimeters are made of which of the following ?
(A)
Glass
(B)
Metal
(C)
Wood
(D)
Either (1) or (2)
Question-6
An ideal gas is compressed adiabatically to
8
/27 times of its present value at 27
o
C. The temperature of the gas becomes (γ=
5
/3).
(A)
475
o
C
(B)
275
o
C
(C)
402
o
C
(D)
175
o
C
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
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-9
540 g of ice at 0
o
C is mixed with 540 g of water at 80
o
C. The final temperature of the mixture is
(A)
40
o
C
(B)
79.9
o
C
(C)
80
o
C
(D)
0
o
C
Question-10
The r.m.s velocity of nitrogen molecules at N.T.P is
(A)
33 m/s
(B)
493 m/s
(C)
517 m/s
(D)
546 m/s
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Plus 1 Biology Science
Tamil Nadu (English Medium)
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