NEET Physics: latent heat Practice Questions
14 free multiple-choice questions on latent heat (Properties of Solids and Liquids) 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.
Practice thousands more NEET questions in the app →Q1. When a substance changes from a liquid to a gas at its boiling point, what is the role of the absorbed energy?
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Correct answer: A — To overcome the intermolecular forces of attraction between the liquid molecules
The absorbed latent heat of vaporization is used entirely to overcome the strong intermolecular forces holding the liquid molecules together, allowing them to escape into the gaseous state. This energy is latent heat, not internal energy related to kinetic energy increase in the conventional sense.
Q2. The term 'specific latent heat' refers to the latent heat associated with which quantity?
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Correct answer: C — A unit mass of the substance.
Specific latent heat is the latent heat calculated per unit mass of the substance (e.g., J/kg), which is crucial for comparing phase changes across different materials.
Q3. Which quantity represents the heat absorbed by a substance to change its temperature while remaining in the same phase?
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Correct answer: C — Specific Heat
Specific heat is the amount of heat required to raise the temperature of a unit mass of a substance by one degree.
Q4. The heat absorbed by a substance to change its state from solid to liquid at its melting point is known as:
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Correct answer: D — Latent heat of fusion
The heat absorbed during the melting process (solid to liquid) is called the latent heat of fusion.
Q5. If a substance absorbs Q amount of heat during a phase transition, and m is the mass of the substance, what is the specific latent heat of that transition?
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Correct answer: D — Q/m
Specific latent heat (L) is defined as the heat energy (Q) required to change the phase of a unit mass (m) of a substance. Thus, L = Q/m.
Q6. What is the primary role of latent heat during a phase change of a substance?
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Correct answer: B — Providing the energy necessary for the phase transition without changing the temperature
Latent heat is the heat absorbed or released by a substance during a phase change (like melting or boiling) without any corresponding change in its temperature.
Q7. The latent heat of fusion of a substance is the heat required to change its state from solid to liquid. This heat is primarily used for which purpose?
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Correct answer: B — Breaking the intermolecular forces of attraction
Latent heat is the energy absorbed or released during a phase change at constant temperature. For melting (fusion), the energy supplied is used to overcome the attractive forces holding the molecules in the fixed lattice structure of the solid state.
Q8. When water boils, the heat supplied during boiling is primarily used for what?
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Correct answer: D — Increasing the potential energy associated with the phase change from liquid to gas.
During boiling (vaporization), the latent heat of vaporization is absorbed, which is the energy used to overcome the intermolecular forces and change the state from liquid to gas, keeping the temperature constant at the boiling point.
Q9. During boiling, the energy supplied by the surroundings is used to overcome which type of forces present between the molecules of the liquid?
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Correct answer: C — Intermolecular attractive forces.
Boiling is a phase transition where the liquid turns into a gas. The absorbed energy (latent heat of vaporization) is used to overcome the strong intermolecular attractive forces holding the liquid molecules together.
Q10. The heat supplied to a substance is used to cause a change in its state of matter. The heat absorbed during this process is known as:
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Correct answer: D — Latent heat
When heat is supplied for a phase change (like melting or boiling), it is the latent heat. Specific heat relates to the heat required to change the temperature of the substance.
Q11. The latent heat of vaporization is primarily associated with the energy required to:
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Correct answer: A — Convert liquid into vapor at a constant temperature
Latent heat of vaporization is the energy required to convert a liquid into a gas (vaporization) at a constant temperature.
Q12. What is the primary physical significance of the latent heat of vaporization?
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Correct answer: B — The energy required to change the state of a liquid to gas
The latent heat of vaporization is the energy required to convert a substance from a liquid state into a gaseous state (vaporization) at its boiling point.
Q13. What is the term used for the heat absorbed or released by a substance during a change of state (like melting or boiling) at constant temperature?
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Correct answer: B — Latent heat
Latent heat is the energy absorbed or released by a substance during a change of state (phase transition) without any change in its temperature.
Q14. Which of the following processes involves the absorption of latent heat during the temperature remains constant?
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Correct answer: B — Melting of ice
Latent heat is the heat absorbed or released by a substance during a change of state (like melting or boiling) without any change in its temperature. This heat is used to break the intermolecular forces.
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