Zeroth Law of Thermodynamics NEET Questions

Physics - Thermodynamics

Zeroth Law of Thermodynamics MCQ Questions


7.
When two systems are in thermal equilibrium, which quantity MUST have the same value for both?
A.
Density
B.
Volume
C.
Temperature
D.
Pressure
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ANSWER :
C. Temperature
8.
In the NCERT Zeroth Law experiment (Fig 11.2a), A and B are separated by an adiabatic wall, each in contact with C via conducting walls. After time:
A.
No change occurs
B.
Only system B changes
C.
Only system A changes
D.
A and B independently equilibrate with C: T_A = T_C and T_B = T_C (via separate conducting walls)
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ANSWER :
D. A and B independently equilibrate with C: T_A = T_C and T_B = T_C (via separate conducting walls)
9.
In the NCERT Zeroth Law experiment, after A and B equilibrate with C, the adiabatic A-B wall is replaced by a conducting wall (C isolated). What is observed?
A.
B gets hotter
B.
A and B exchange heat vigorously
C.
A gets hotter
D.
A and B show no further change — already in thermal equilibrium with each other
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ANSWER :
D. A and B show no further change — already in thermal equilibrium with each other
10.
In the Zeroth Law experiment, what is the conceptual role of system C?
A.
C generates heat
B.
C transfers matter between A and B
C.
C acts as a thermometer — the common third system establishing T_A = T_C = T_B
D.
C provides mechanical support
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ANSWER :
C. C acts as a thermometer — the common third system establishing T_A = T_C = T_B
11.
In the Zeroth Law experiment, why is an adiabatic wall placed between A and B?
A.
To equalise pressures of A and B
B.
To conduct heat from A to B
C.
To allow A and B to exchange heat directly
D.
To prevent direct thermal interaction between A and B while they independently equilibrate with C
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ANSWER :
D. To prevent direct thermal interaction between A and B while they independently equilibrate with C
12.
The critical NCERT quote that constitutes the empirical basis of the Zeroth Law is:
A.
'States of A and B change no further — they are found to be in thermal equilibrium with each other'
B.
'Energy is conserved'
C.
'Carnot efficiency is 1-T2/T1'
D.
'Heat flows from hot to cold'
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ANSWER :
A. 'States of A and B change no further — they are found to be in thermal equilibrium with each other'