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NEET Physics: zeroth law of thermodynamics Practice Questions

15 free multiple-choice questions on zeroth law of thermodynamics (Thermodynamics) for NEET Physics, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.

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  1. Q1. If system A is in thermal equilibrium with system B, and system B is in thermal equilibrium with system C, then what follows according to the Zeroth Law?

    • AA is hotter than C
    • BA is at the same temperature as C
    • CA is at the same temperature as B
    • DA is in thermal equilibrium with C
    Show answer & explanation

    Correct answer: D — A is in thermal equilibrium with C

    The Zeroth Law states that if two bodies are in equilibrium with a third body, they are all in mutual thermal equilibrium, allowing us to define a consistent temperature scale.

  2. Q2. Which of the following physical quantities is the basis for establishing thermal equilibrium according to the Zeroth Law?

    • AHeat energy
    • BWork done
    • CInternal energy
    • DTemperature
    Show answer & explanation

    Correct answer: D — Temperature

    Temperature is the property that determines whether two systems are in thermal equilibrium, as stipulated by the Zeroth Law.

  3. Q3. The Zeroth Law of Thermodynamics is primarily concerned with which concept?

    • AThe internal energy of a system
    • BThermal equilibrium
    • CThe direction of heat transfer
    • DHeat flow between systems
    Show answer & explanation

    Correct answer: B — Thermal equilibrium

    The Zeroth Law establishes the concept of thermal equilibrium. It states that if two systems are in equilibrium with a third system, they are all mutually in equilibrium, which is the foundation for defining temperature.

  4. Q4. The Zeroth Law is crucial in thermodynamics because it introduces which concept for the first time?

    • AThe concept of thermal balance
    • BEntropy
    • CConservation of energy
    • DThe concept of reversible process
    Show answer & explanation

    Correct answer: A — The concept of thermal balance

    The law is the foundation upon which the concept of temperature, as a state variable, is built.

  5. Q5. If two systems, P and Q, are in thermal equilibrium with each other, and Q is in thermal equilibrium with R, then P and R must be in:

    • Athermal equilibrium
    • Bisolation
    • Cnon-equilibrium
    • Dadiabatic state
    Show answer & explanation

    Correct answer: A — thermal equilibrium

    This is the transitive property derived from the Zeroth Law: if P=Q and Q=R, then P=R (thermal equilibrium).

  6. Q6. The Zeroth Law of Thermodynamics establishes the criterion for which state of two systems in thermal contact?

    • AThermal equilibrium
    • BInternal energy is conserved
    • CWork is done
    • DHeat transfer occurs
    Show answer & explanation

    Correct answer: A — Thermal equilibrium

    The Zeroth Law deals specifically with the condition for thermal equilibrium between systems placed in contact.

  7. Q7. Which of the following statements is true regarding the measurement of temperature based on the Zeroth Law concept?

    • ATemperature is the property that allows thermal equilibrium to be established.
    • BTemperature is directly proportional to heat absorbed.
    • CTemperature determines the direction of heat flow.
    • DTemperature is the measure of total energy of a system.
    Show answer & explanation

    Correct answer: A — Temperature is the property that allows thermal equilibrium to be established.

    The Zeroth Law underpins the concept that temperature is the property that dictates whether two systems are in thermal equilibrium.

  8. Q8. Which physical property is defined by the Zeroth Law as the necessary condition for thermal equilibrium between two systems?

    • ATemperature
    • BInternal Energy
    • CHeat Flow
    • DPressure
    Show answer & explanation

    Correct answer: A — Temperature

    Temperature is the property that governs whether two systems are in thermal equilibrium.

  9. Q9. Which of the following properties is a measure used to determine if two systems are in thermal equilibrium?

    • ATotal energy content
    • BTemperature
    • CVolume
    • DKinetic energy of particles
    Show answer & explanation

    Correct answer: B — Temperature

    Temperature is the defining property used by the Zeroth Law to establish thermal equilibrium. Two systems are in equilibrium when they share the same temperature.

  10. Q10. If two objects are brought into contact and reach a constant temperature, this indicates that they have achieved what state?

    • AThermal equilibrium
    • BMechanical stability
    • CThermal isolation
    • DMechanical equilibrium
    Show answer & explanation

    Correct answer: A — Thermal equilibrium

    When two systems reach a constant temperature upon contact, they have established thermal equilibrium.

  11. Q11. The Zeroth Law of Thermodynamics is most relevant for defining which fundamental concept in thermodynamics?

    • AConservation of energy
    • BHeat capacity
    • CEntropy
    • DTemperature
    Show answer & explanation

    Correct answer: D — Temperature

    The Zeroth Law deals specifically with the concept of temperature and its relationship to thermal equilibrium, serving as the basis for the entire thermodynamic scale.

  12. Q12. Which of the following statements correctly describes the condition for two thermodynamic systems to be in thermal equilibrium?

    • AThey must have the same total energy.
    • BNo net heat transfer occurs between them when placed in thermal contact.
    • CThey must have the same internal pressure.
    • DThey must be in mechanical equilibrium.
    Show answer & explanation

    Correct answer: B — No net heat transfer occurs between them when placed in thermal contact.

    The Zeroth Law of Thermodynamics states that if two thermodynamic systems are in thermal contact and reach a state of thermal equilibrium, then they must have the same temperature. Thermal equilibrium is fundamentally defined by the absence of net heat transfer between the systems.

  13. Q13. What is the fundamental basis upon which temperature is defined according to the Zeroth Law?

    • AThe state of thermal equilibrium
    • BThe net flow of heat
    • CThe amount of kinetic energy of the molecules
    • DThe change in internal energy
    Show answer & explanation

    Correct answer: A — The state of thermal equilibrium

    Temperature is a property that dictates the thermal equilibrium state between systems.

  14. Q14. The Zeroth Law of Thermodynamics primarily deals with which concept?

    • AThermal equilibrium
    • BHeat flow
    • CEntropy
    • DInternal energy
    Show answer & explanation

    Correct answer: A — Thermal equilibrium

    The Zeroth Law deals specifically with the condition of thermal equilibrium between systems.

  15. Q15. The Zeroth Law implies that temperature is a property that is:

    • Akinetic
    • Babsolute
    • Cextensive
    • Dintensive
    Show answer & explanation

    Correct answer: D — intensive

    Temperature is an intensive property, meaning it does not depend on the total amount of matter in the system, and it is the property used to define thermal equilibrium.

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