Zeroth Law of Thermodynamics NEET Questions

Physics - Thermodynamics

Zeroth Law of Thermodynamics MCQ Questions


13.
After the Zeroth Law experiment (T_A = T_C = T_B), if C is removed and A and B contact each other, what happens?
A.
A absorbs heat from B
B.
B absorbs heat from A
C.
Both cool to room temperature
D.
No net heat exchange — T_A = T_B, so A and B are already in thermal equilibrium
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ANSWER :
D. No net heat exchange — T_A = T_B, so A and B are already in thermal equilibrium
14.
During the Zeroth Law experiment (Fig 11.2a), if T_C increases while equilibrating with A, what happens to system B (which is in contact with C via a conducting wall)?
A.
B cools down
B.
B is unaffected because A-B are separated by an adiabatic wall
C.
B expands immediately
D.
B heats up because A is hotter
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ANSWER :
B. B is unaffected because A-B are separated by an adiabatic wall
15.
The Zeroth Law provides a rigorous basis for temperature by establishing that:
A.
Temperature is defined only for ideal gases
B.
Temperature is same as pressure
C.
Temperature equals internal energy per unit volume
D.
Temperature is a well-defined intensive variable equal for all bodies in mutual thermal equilibrium — making it universally comparable
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ANSWER :
D. Temperature is a well-defined intensive variable equal for all bodies in mutual thermal equilibrium — making it universally comparable
16.
The Zeroth Law leads to thermometry. What question does thermometry specifically address?
A.
How to assign numerical values to temperatures — constructing a measurable temperature scale
B.
Maximum possible temperature?
C.
Efficiency of a heat engine?
D.
Entropy of a system?
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ANSWER :
A. How to assign numerical values to temperatures — constructing a measurable temperature scale
17.
Temperature is described in NCERT as 'a marker of the hotness of a body' that determines:
A.
The volume of the body
B.
The direction of heat flow when bodies are in thermal contact — from higher to lower temperature
C.
The charge of the body
D.
The mass of the body
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ANSWER :
B. The direction of heat flow when bodies are in thermal contact — from higher to lower temperature
18.
Which correctly describes the logical sequence from NCERT's development of the Zeroth Law?
A.
Thermometry → Temperature → Zeroth Law
B.
Temperature → Zeroth Law → Thermal equilibrium
C.
Thermal equilibrium experiment → Zeroth Law stated → Temperature defined → Thermometry
D.
Zeroth Law → Carnot engine → Temperature
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ANSWER :
C. Thermal equilibrium experiment → Zeroth Law stated → Temperature defined → Thermometry