NEET Physics: Heat Practice Questions
15 free multiple-choice questions on 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. Heat is the transfer of thermal energy. Which of the following is a measure of this energy transfer?
Show answer & explanation
Correct answer: D — Calorimetry
Calorimetry is the science of measuring heat transfer. Heat itself is the energy transfer, and calorimetry deals with its measurement.
Q2. Which mode of heat transfer does not require the presence of a medium?
Show answer & explanation
Correct answer: D — Radiation
Radiation is the transfer of heat through electromagnetic waves and does not require any medium (unlike conduction and convection).
Q3. When heat is transferred through a solid material primarily by the vibration and collision of adjacent particles, what mode of heat transfer is occurring?
Show answer & explanation
Correct answer: C — Conduction
Heat transfer through direct contact in solids is primarily through conduction, where energy is passed by the vibration and collision of adjacent particles.
Q4. Which of the following is the primary mechanism for heat transfer in liquids and gases?
Show answer & explanation
Correct answer: D — Convection
Liquids and gases primarily transfer heat to their surroundings through the movement of the fluid itself, which is called convection.
Q5. If the temperature of a gas is doubled, what happens to the average kinetic energy of its molecules?
Show answer & explanation
Correct answer: B — It is doubled
The average kinetic energy of gas molecules is directly proportional to the absolute temperature (E ∝ T). If temperature is doubled, kinetic energy is doubled.
Q6. Thermal expansion occurs because the intermolecular forces in solids and liquids:
Show answer & explanation
Correct answer: D — Decrease upon heating
When heat is supplied, the kinetic energy of the particles increases, causing them to move farther apart, thus increasing the intermolecular forces' effect on volume expansion.
Q7. If the temperature of a liquid remains constant while it is being heated, this indicates that the heat energy supplied is being used for which process?
Show answer & explanation
Correct answer: D — Phase change
When the temperature remains constant during heating, the supplied heat energy is used to break intermolecular bonds, which corresponds to a phase change (like melting or boiling), absorbing latent heat.
Q8. The process by which heat is transferred through the direct contact of matter without any macroscopic movement of the medium is known as:
Show answer & explanation
Correct answer: C — Conduction
Conduction is the mode of heat transfer that occurs through direct contact between particles, often through solids.
Q9. The tendency of solids and liquids to expand when heated is due to:
Show answer & explanation
Correct answer: A — Increase in the volume of the molecules
When heated, the particles gain kinetic energy, move faster, and the average separation between them increases, leading to expansion.
Q10. The heat content of a body is directly related to its internal energy. What is the relationship between heat and internal energy in thermodynamics?
Show answer & explanation
Correct answer: C — Heat is a form of energy, and internal energy is the total microscopic kinetic and potential energy of the molecules.
Heat is the transfer of thermal energy, and internal energy is the total microscopic kinetic and potential energy stored within the system (the substance). They are fundamentally related through the First Law of Thermodynamics.
Q11. During a phase change from liquid to vapor at constant temperature, the energy supplied is known as which type of heat?
Show answer & explanation
Correct answer: D — Latent heat
Heat supplied during a phase change without any change in temperature is called Latent heat.
Q12. Which material generally has a higher thermal conductivity, meaning it transfers heat more easily?
Show answer & explanation
Correct answer: D — Copper
Copper is a metal known for its excellent thermal conductivity, allowing it to transfer heat very efficiently compared to wood, air, or glass.
Q13. The state change of a substance from liquid to gas at a constant temperature is an example of a process involving:
Show answer & explanation
Correct answer: C — Latent heat
The heat absorbed or released during a change of state (like melting or boiling) without a change in temperature is called latent heat.
Q14. Which of the following phenomena is primarily responsible for the change in the volume of a solid when it is heated?
Show answer & explanation
Correct answer: C — Thermal expansion
When solids are heated, the average kinetic energy of the molecules increases, causing the intermolecular forces to expand, resulting in an increase in the volume. This is thermal expansion.
Q15. If the temperature of a substance remains constant while heat is supplied to it, it implies that the heat energy supplied is being used for which process?
Show answer & explanation
Correct answer: B — Changing the phase of the substance
When heat is supplied without a change in temperature, it is used to change the phase (e.g., melting or boiling) of the substance, which is the latent heat process.
Keep going — practice on Padhai Karlo
Padhai Karlo gives you unlimited NEET practice: chapter-wise questions, timed quizzes, and full mock tests with an All-India Rank — free to start.
Get the free Android app →