Thermal Equilibrium and the Concept of Temperature NEET Questions

Physics - Thermodynamics

Thermal Equilibrium and the Concept of Temperature MCQ Questions


7.
In the caloric picture of heat, heat flow between two bodies was expected to stop when:
A.
Work done on the system becomes zero
B.
The caloric levels (temperatures) equalise
C.
Pressure equalises
D.
Both bodies reach 0°C
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ANSWER :
B. The caloric levels (temperatures) equalise
8.
A thermodynamic system is said to be in a state of equilibrium when:
A.
Its molecules are all at rest
B.
Net external force on it is zero (mechanical definition only)
C.
Pressure equals atmospheric pressure
D.
The macroscopic variables that characterise the system do not change in time
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ANSWER :
D. The macroscopic variables that characterise the system do not change in time
9.
An adiabatic wall between two gas systems is described in NCERT as:
A.
A wall with infinite thermal conductivity
B.
A conducting wall that allows heat flow
C.
A wall that allows mass transfer
D.
An insulating wall that does not allow flow of energy (heat) from one system to another
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ANSWER :
D. An insulating wall that does not allow flow of energy (heat) from one system to another
10.
A diathermic wall is defined as:
A.
A conducting wall that allows energy (heat) flow from one system to another
B.
A wall that reflects all radiation
C.
An insulating wall
D.
A perfectly rigid wall that cannot move
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ANSWER :
A. A conducting wall that allows energy (heat) flow from one system to another
11.
Two gas systems A and B are separated by an adiabatic wall. System A has state (P_A, V_A) and system B has state (P_B, V_B). Which of the following is correct?
A.
A and B always exchange heat slowly
B.
Any combination of (P_A, V_A) can be in equilibrium with any combination of (P_B, V_B) — they are thermally independent
C.
A and B must have equal pressures
D.
A and B must have equal temperatures
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ANSWER :
B. Any combination of (P_A, V_A) can be in equilibrium with any combination of (P_B, V_B) — they are thermally independent
12.
When two gas systems A and B (initially at different states) are separated by a diathermic wall, what happens?
A.
Nothing changes — adiabatic walls prevent change
B.
The macroscopic variables of A and B change spontaneously until both systems attain thermal equilibrium with each other
C.
Only system B changes its state
D.
Only system A changes its state
😑 View Answer Rough Work Error
ANSWER :
B. The macroscopic variables of A and B change spontaneously until both systems attain thermal equilibrium with each other