Thermodynamics AFCAT Questions

AFCAT Physics

Thermodynamics MCQ Questions


7.
Equilibrium in thermodynamics means that:
A.
All molecules are at rest
B.
The net external force on the system is zero
C.
The macroscopic variables characterising the system do not change in time
D.
Pressure is equal to atmospheric pressure
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ANSWER :
C. The macroscopic variables characterising the system do not change in time
8.
An adiabatic wall is one that:
A.
Allows heat to flow freely between systems
B.
Is always rigid and immovable
C.
Does not allow flow of heat between the systems it separates
D.
Allows matter to flow but not heat
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ANSWER :
C. Does not allow flow of heat between the systems it separates
9.
A diathermic wall is one that:
A.
Allows heat to flow between the systems it separates
B.
Reflects heat back to the source
C.
Prevents heat flow between systems
D.
Allows matter to flow but blocks heat
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ANSWER :
A. Allows heat to flow between the systems it separates
10.
When two systems separated by a diathermic wall are placed in contact, they:
A.
Exchange matter until masses are equal
B.
Always reach the average of the two pressures
C.
Exchange heat until both reach the same temperature (thermal equilibrium)
D.
Always remain at their original temperatures
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ANSWER :
C. Exchange heat until both reach the same temperature (thermal equilibrium)
11.
The Zeroth Law of Thermodynamics states that:
A.
Heat cannot flow from a colder body to a hotter body spontaneously
B.
Energy can neither be created nor destroyed
C.
Entropy of an isolated system always increases
D.
Two systems in thermal equilibrium with a third system separately are in thermal equilibrium with each other
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ANSWER :
D. Two systems in thermal equilibrium with a third system separately are in thermal equilibrium with each other
12.
The Zeroth Law of Thermodynamics was formulated by:
A.
Lord Kelvin in 1851
B.
Sadi Carnot in 1824
C.
James Joule in 1845
D.
R. H. Fowler in 1931
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ANSWER :
D. R. H. Fowler in 1931