NEET-UG and JEE Main Physics · Class 11
Thermal equilibrium and the zeroth law — NEET & JEE Questions
Thermal equilibrium and the zeroth law is a topic in Thermodynamics, a Class 11 Physics chapter of the NEET-UG and JEE Main syllabus. TestBudy holds 12 published NEET-UG and JEE Main questions on Thermal equilibrium and the zeroth law, each with the marking scheme of the real paper.
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Thermal equilibrium and the zeroth law MCQs with solutions
10 of the 12 published questions on this topic, exactly as they appear in a test. Answers and worked solutions come with your result rather than on this page.
The zeroth law of thermodynamics states that if two systems are each in thermal equilibrium with a third system, then they are
- A. in thermal equilibrium with each other
- B. at equal pressure only
- C. at equal volume only
- D. necessarily identical in composition
Two bodies are in thermal equilibrium when
- A. there is no net heat flow between them when placed in thermal contact
- B. their masses are equal
- C. their internal energies are equal
- D. their volumes are equal
The zeroth law provides the conceptual basis for
- A. temperature measurement with a thermometer
- B. conservation of energy
- C. entropy increase
- D. mechanical equilibrium only
If body A and body B are in thermal equilibrium, which statement must be true?
- A. They have the same temperature
- B. They have the same mass
- C. They contain the same amount of heat
- D. They have the same specific heat
Thermometer T is in equilibrium with object A at 300 K. The same thermometer is then found to be in equilibrium with object B without changing its reading. What can be concluded?
- A. A and B are in thermal equilibrium with each other
- B. A and B have equal masses
- C. A and B have equal heat capacities
- D. No conclusion can be drawn
A metal block at 350 K is placed in contact with another block at 300 K in an insulated enclosure. Initially, heat flows
- A. from the 350 K block to the 300 K block
- B. from the 300 K block to the 350 K block
- C. in both directions equally with zero net transfer
- D. nowhere because the enclosure is insulated
Two objects at different temperatures are placed in thermal contact inside an insulated container. At equilibrium, which quantity must be equal for both?
- A. Temperature
- B. Internal energy
- C. Mass
- D. Heat capacity
A thermometer initially at room temperature is placed in hot water. Why should its reading be taken only after waiting briefly?
- A. It must reach thermal equilibrium with the water
- B. Its mass must become equal to the water mass
- C. The water must stop evaporating
- D. Its heat capacity must become zero
System A is in thermal equilibrium with C, and B is also in thermal equilibrium with C. If A and B are then placed in direct thermal contact, what happens ideally?
- A. No net heat flows between A and B
- B. Heat must flow from A to B
- C. Heat must flow from B to A
- D. Both temperatures become zero
Object P has greater internal energy than object Q, yet both are at the same temperature. Which statement is correct if they are placed in thermal contact?
- A. No net heat need flow merely because P has greater internal energy
- B. Heat must flow from P to Q
- C. Heat must flow from Q to P
- D. Temperature is irrelevant to heat flow
Common mistakes in Thermal equilibrium and the zeroth law
Recorded against questions in this topic that are not shown above, so none of these points at an answer you can see on this page.
- Uses energy conservation rather than the definition of thermal equilibrium.
- Infers equality of internal energy or heat capacity from equality of temperature.
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