JEE Main - Thermal equilibrium and zeroth law Online Test (MCQ Quiz)

1. What is the fundamental condition for two systems to be in thermal equilibrium?

A) They have the same volume. B) They have the same pressure. C) They have the same temperature. D) They have the same number of moles.

2. The Zeroth Law of Thermodynamics deals with the concept of:

A) Energy transfer as heat. B) Energy transfer as work. C) Temperature. D) Entropy.

3. If system A is in thermal equilibrium with system B, and system B is in thermal equilibrium with system C, then system A is also in thermal equilibrium with system C. This statement is known as:

A) First Law of Thermodynamics B) Second Law of Thermodynamics C) Third Law of Thermodynamics D) Zeroth Law of Thermodynamics

4. Which law provides the basis for the definition of temperature?

A) Zeroth Law B) First Law C) Second Law D) Third Law

5. Two objects are in thermal contact. What happens if they are at different temperatures?

A) Heat will flow from the colder object to the hotter object. B) Heat will flow from the hotter object to the colder object. C) No heat will flow between them. D) Their temperatures will increase equally.

6. What is the state called when there is no net flow of heat between two systems in thermal contact?

A) Mechanical equilibrium B) Chemical equilibrium C) Thermal equilibrium D) Phase equilibrium

7. The Zeroth Law of Thermodynamics is a fundamental principle that helps establish:

A) Conservation of energy B) The direction of spontaneous processes C) A consistent scale for temperature measurement D) The concept of absolute zero

8. Consider three systems A, B, and C. If A is in thermal equilibrium with B, and A is also in thermal equilibrium with C, then what can be concluded about B and C?

A) B and C are in thermal equilibrium. B) B and C are not necessarily in thermal equilibrium. C) B and C are in mechanical equilibrium. D) B and C are in chemical equilibrium.

9. In the context of the Zeroth Law, if two systems are in thermal equilibrium, what is the same for both systems?

A) Internal energy B) Heat content C) Temperature D) Specific heat capacity

10. Which of the following is a direct consequence of the Zeroth Law of Thermodynamics?

A) The impossibility of a perpetual motion machine of the first kind. B) The definition and measurement of temperature. C) The concept of entropy always increasing in an isolated system. D) The relationship between heat, work, and internal energy.

11. A thermometer works on the principle of achieving which state with the object being measured?

A) Mechanical equilibrium B) Chemical equilibrium C) Thermal equilibrium D) Electrical equilibrium

12. If a system is isolated, no heat can flow into or out of it. What does this imply about its thermal equilibrium with another system it is not in contact with?

A) It is always in thermal equilibrium. B) It cannot be in thermal equilibrium. C) It can be in thermal equilibrium if they have the same temperature. D) Its thermal equilibrium status is indeterminate.

13. The Zeroth Law establishes that temperature is a property that determines whether two systems will exchange heat when placed in thermal contact. This is a statement of:

A) Heat transfer mechanism B) Thermal equilibrium C) Thermodynamic potential D) Phase transition

14. Which of the following scenarios illustrates the Zeroth Law of Thermodynamics?

A) A gas expanding when heated. B) A battery converting chemical energy to electrical energy. C) A thermometer placed in a liquid indicating the liquid's temperature. D) Ice melting at 0°C.

15. When two bodies are in thermal equilibrium, their internal energies are equal. Is this statement true or false according to the Zeroth Law?

A) True, because they are at the same temperature. B) False, only their temperatures are necessarily equal. C) True, if they are made of the same material. D) False, internal energy is unrelated to thermal equilibrium.

16. What is the primary implication of thermal equilibrium for the macroscopic properties of systems?

A) Their volumes become equal. B) Their pressures become equal. C) Their temperatures become equal. D) Their masses become equal.

17. The Zeroth Law of Thermodynamics can be generalized to state that temperature is an intensive property that, when equal between systems, leads to:

A) No net heat flow B) Maximum entropy C) Minimum free energy D) Spontaneous work

18. If system A and system B are in thermal equilibrium, and system B and system C are in thermal equilibrium, what can be said about the heat transfer between A and C if they are placed in contact?

A) Heat will flow from A to C. B) Heat will flow from C to A. C) No net heat will flow between A and C. D) The direction of heat flow depends on their masses.

19. Which of the following is NOT a condition for thermal equilibrium?

A) Systems are in thermal contact. B) No net flow of heat occurs. C) Systems have equal volumes. D) Systems have equal temperatures.

20. The Zeroth Law is considered foundational because it allows for the definition of temperature, a concept essential for understanding which other laws?

A) Only the First Law B) Only the Second Law C) The First and Second Laws D) The Third Law only

21. If two systems are in thermal equilibrium, it means that:

A) They are identical in all respects. B) They have the same energy content. C) They are at the same temperature. D) They can perform the same amount of work.

22. What is the role of the Zeroth Law in experimental measurements involving temperature?

A) It quantifies the rate of heat transfer. B) It defines the unit of heat. C) It justifies the use of a thermometer to measure temperature. D) It explains the conversion of heat to work.

23. Consider two insulated containers, A and B, each containing a gas. If container A is in thermal equilibrium with a thermometer, and container B is also in thermal equilibrium with the same thermometer, then containers A and B are:

A) In mechanical equilibrium. B) In chemical equilibrium. C) In thermal equilibrium with each other. D) Not necessarily in thermal equilibrium.

24. The Zeroth Law states that temperature is a property that governs heat exchange. If two systems do not exchange heat when in thermal contact, they are said to be in:

A) Isothermal process B) Adiabatic process C) Thermal equilibrium D) Phase equilibrium

25. Which of the following is a necessary condition for applying the principle of thermal equilibrium between two systems?

A) They must be of the same size. B) They must be able to exchange energy via heat. C) They must perform equal amounts of work. D) They must have equal specific heat capacities.

26. The Zeroth Law of Thermodynamics is often stated in terms of transitive property of thermal equilibrium. This means if A ↔ B and B ↔ C, then:

A) A = C B) A ↔ C C) A ≠ C D) A and C are in mechanical equilibrium.

27. What is the significance of the Zeroth Law for defining a temperature scale?

A) It defines the absolute zero point. B) It establishes that temperature is a measure of the average kinetic energy of particles. C) It provides the basis for comparing temperatures of different objects using a third object (thermometer). D) It dictates the relationship between heat and work.

28. If a system is in thermal equilibrium with the surroundings, what is the net heat transfer between the system and the surroundings?

A) Maximum B) Minimum C) Zero D) Dependent on pressure

29. The concept of thermal equilibrium is crucial for understanding which thermodynamic process?

A) Adiabatic expansion B) Isothermal compression C) Free expansion D) All processes involving heat exchange

30. According to the Zeroth Law, if two systems are in thermal equilibrium, they must have the same:

A) Entropy B) Enthalpy C) Temperature D) Gibbs Free Energy

31. Which statement best describes the relationship between thermal equilibrium and heat flow?

A) Heat flows until thermal equilibrium is reached. B) Thermal equilibrium prevents heat flow. C) Heat flow causes thermal equilibrium. D) Thermal equilibrium implies a constant rate of heat flow.

32. The Zeroth Law is considered a postulate because:

A) It can be derived from the First and Second Laws. B) It is an empirically observed fact that forms the basis for temperature measurement. C) It defines the relationship between heat and internal energy. D) It explains the behavior of ideal gases.

33. If a system is in thermal equilibrium with another system, it implies that their energy transfer in the form of heat is:

A) Rapid B) Constant C) Zero D) Variable

34. What property of a system is uniquely determined by its thermal equilibrium state with other systems?

A) Volume B) Pressure C) Temperature D) Mass

35. The Zeroth Law allows us to compare temperatures without necessarily measuring them directly, by using a third system. This third system is typically a:

A) Heat engine B) Refrigerator C) Thermometer D) Calorimeter

36. Which of the following statements is FALSE regarding thermal equilibrium?

A) It implies equal temperatures. B) It means no net heat transfer. C) It can be achieved between systems with different volumes. D) It requires systems to be identical.

37. The Zeroth Law is fundamental to the concept of temperature. If A and B are in thermal equilibrium, then temperature of A is equal to temperature of B. This is a direct consequence of:

A) First Law B) Second Law C) Third Law D) Zeroth Law

38. When a system reaches thermal equilibrium with its surroundings, the temperature of the system becomes:

A) Higher than the surroundings B) Lower than the surroundings C) Equal to the surroundings D) Unpredictable

39. The Zeroth Law of Thermodynamics is a statement about:

A) Conservation of energy B) The definition of temperature C) The direction of spontaneous processes D) The unattainability of absolute zero

40. If system A is in thermal equilibrium with system B, and system C is also in thermal equilibrium with system B, what is the relationship between system A and system C?

A) They are identical. B) They are at the same temperature. C) They are in mechanical equilibrium. D) They are in chemical equilibrium.

41. The condition for thermal equilibrium is that the temperatures of the systems in thermal contact must be:

A) Increasing B) Decreasing C) Constant D) Equal

42. Which law is implicitly used when we say a thermometer measures the temperature of an object?

A) First Law of Thermodynamics B) Second Law of Thermodynamics C) Zeroth Law of Thermodynamics D) Law of Conservation of Mass

43. If two systems are in thermal equilibrium, what can be said about their heat capacities?

A) They must be equal. B) They must be proportional. C) They can be different. D) They must be inversely proportional.

44. The Zeroth Law of Thermodynamics is fundamental because it establishes the existence of a property that determines thermal equilibrium. This property is:

A) Pressure B) Volume C) Temperature D) Density

45. What happens to the net heat transfer between two systems when they achieve thermal equilibrium?

A) It increases. B) It decreases. C) It becomes zero. D) It becomes constant but non-zero.

46. The Zeroth Law is a transitive relation for which physical quantity?

A) Pressure B) Volume C) Temperature D) Internal Energy

47. If system A is hotter than system B, and system B is in thermal equilibrium with system C, what can be said about the heat transfer between A and C?

A) Heat will flow from A to C. B) Heat will flow from C to A. C) No net heat will flow between A and C. D) The direction depends on their volumes.

48. The Zeroth Law states that temperature is the property that determines the direction of spontaneous heat flow when two systems are brought into thermal contact. This is a statement of:

A) Energy conservation B) Equilibrium condition C) Entropy maximization D) Work done by a system

49. Which condition must be met for two systems to be considered in thermal equilibrium?

A) They must be in physical contact. B) There must be no net exchange of energy as heat. C) They must be made of the same substance. D) They must have the same specific heat capacity.

50. The Zeroth Law provides the conceptual basis for measuring temperature. If object X is in thermal equilibrium with thermometer T, and object Y is also in thermal equilibrium with thermometer T, then object X and object Y are:

A) Identical B) In mechanical equilibrium C) In thermal equilibrium D) In chemical equilibrium

Thermal equilibrium and zeroth law - Online Test

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