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Physics Chapter 8 : Topic 1
Thermal Equilibrium
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Two bodies are said to be in thermal equilibrium when they have:
Reasoning: Thermal equilibrium exists when bodies have the same temperature and no net heat flows between them.
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If two regions have the same temperature, they are:
Reasoning: Equal temperature is the condition for thermal equilibrium.
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In thermal equilibrium, the net transfer of heat between two bodies is:
Reasoning: Heat flows only when a temperature difference exists.
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A hot metal block is placed in contact with a cold block. Thermal equilibrium is reached when:
Reasoning: Heat transfer continues until the temperatures become equal.
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Which statement best defines thermal equilibrium?
Reasoning: Thermal equilibrium is characterized by equal temperature and no net heat exchange.
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If Body $\mathbf{A}$ is in thermal equilibrium with Body $\mathbf{B}$, then:
Reasoning: Thermal equilibrium implies equal temperatures.
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Heat naturally flows from:
Reasoning: Heat flows spontaneously from hot regions to cold regions.
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Which condition prevents heat transfer between two objects in contact?
Reasoning: Without a temperature difference, there is no driving force for heat flow.
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A thermometer placed in a liquid eventually shows a constant reading because:
Reasoning: The thermometer and liquid reach the same temperature.
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Which of the following indicates that thermal equilibrium has been reached?
Reasoning: No temperature difference means no net heat transfer.
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The concept that regions of equal temperature are in thermal equilibrium is based on:
Reasoning: The Zeroth Law establishes the concept of temperature and thermal equilibrium. The zeroth law of thermodynamics states that if two systems are each in thermal equilibrium with a third system, they are also in thermal equilibrium with each other. This fundamental law defines the concept of temperature and makes temperature measurement possible.
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Two objects in thermal equilibrium may have different:
Reasoning: Objects can have equal temperatures but different masses and internal energies.
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A cup of tea is left in a room. Eventually, the tea reaches thermal equilibrium with the room because:
Reasoning: Heat exchange continues until both have the same temperature.
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When two regions are at equal temperature:
Reasoning: Microscopic energy exchange may occur, but net heat flow is zero.
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Which example best illustrates thermal equilibrium?
Reasoning: A stable thermometer reading indicates equal temperature.
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If Object $\mathbf{A}$ and Object $\mathbf{B}$ are in thermal equilibrium, and $\mathbf{B}$ is in thermal equilibrium with $\mathbf{C}$, then:
Reasoning: This is the Zeroth Law of Thermodynamics.
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Why does heat stop flowing between two objects after some time?
Reasoning: Equal temperatures eliminate the cause of heat flow.
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A metal spoon placed in hot soup eventually becomes the same temperature as the soup. At that stage:
Reasoning: Equal temperatures indicate thermal equilibrium.
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Thermal equilibrium is impossible when:
Reasoning: Different temperatures mean thermal equilibrium has not been achieved.
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Which quantity determines the direction of heat flow?
Reasoning: Heat always flows due to a temperature difference.
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A cold object and a hot object are placed in contact. The final equilibrium temperature will:
Reasoning: Equilibrium temperature lies between the initial temperatures.
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Which statement is true about thermal equilibrium?
Reasoning: Both conditions define thermal equilibrium.
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A thermometer works because:
Reasoning: The thermometer acquires the object’s temperature through thermal equilibrium.
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If two regions are at different temperatures:
Reasoning: A temperature difference causes heat flow.
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Which law forms the basis for temperature measurement?
Reasoning: The Zeroth Law allows temperature comparison using thermometers.
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Two objects may be in thermal equilibrium even if they have different:
Reasoning: Equal temperature is required, not equal mass.
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A large bucket of water and a small cup of water can be in thermal equilibrium if they have:
Reasoning: Thermal equilibrium depends only on temperature equality.
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Why does a thermometer reading stop changing after some time?
Reasoning: A stable reading indicates equal temperature.
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Which situation represents a system not in thermal equilibrium?
Reasoning: Melting indicates ongoing heat transfer due to temperature difference.
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If no net heat transfer occurs between two bodies, then:
Reasoning: Absence of net heat flow indicates thermal equilibrium.
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Thermal equilibrium is a dynamic condition because:
Reasoning: Energy exchange continues microscopically, but there is no net heat transfer.
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The phrase “regions of equal temperature are in thermal equilibrium” implies that:
Reasoning: Equal temperature is the defining condition of thermal equilibrium.
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Which factor is most directly associated with thermal equilibrium?
Reasoning: Thermal equilibrium is defined by equal temperature.
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A thermometer placed in boiling water eventually reads a constant value. This means:
Reasoning: Constant temperature reading indicates equilibrium.
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Which statement about thermal equilibrium is incorrect?
Reasoning: Equal masses are not required for thermal equilibrium.
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The final state reached after heat exchange between two objects is called:
Reasoning: Equal temperature after heat exchange is thermal equilibrium.
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The concept of thermal equilibrium allows scientists to:
Reasoning: Temperature is defined through thermal equilibrium.
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A hot object and a cold object are insulated from the surroundings. Eventually they reach:
Reasoning: Heat exchange continues until temperatures become equal.
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Which of the following is a direct consequence of thermal equilibrium?
Reasoning: Equal temperature means no temperature gradient.
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