NEET Physics: Heat transfer Practice Questions
15 free multiple-choice questions on Heat transfer (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 two objects are placed in thermal contact, heat is transferred between them primarily through which mechanism?
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Correct answer: B — Conduction
Heat transfer through direct contact between solid objects occurs via conduction, which is the transfer of thermal energy through molecular vibration and collision.
Q2. If a substance has a low specific heat capacity, it means that:
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Correct answer: A — It requires a small amount of energy to raise its temperature
A low specific heat capacity implies that only a small amount of heat energy is needed to cause a significant change in the substance's temperature.
Q3. In a fluid, the primary mechanism for heat transfer through bulk movement of the fluid itself is known as:
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Correct answer: C — Convection
Convection involves the movement of mass (fluid) due to density differences caused by temperature variations, thereby transferring heat.
Q4. Which mode of heat transfer is primarily responsible for the transfer of heat through a solid material like a metal rod?
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Correct answer: D — Conduction
Heat transfer through a solid, where particles vibrate and transfer energy to adjacent particles, is defined as conduction.
Q5. Which of the following statements best describes the mechanism of heat transfer by radiation?
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Correct answer: A — It does not require any medium.
Radiation is the transfer of thermal energy via electromagnetic waves and does not require any physical medium to propagate.
Q6. The transfer of heat by electromagnetic waves, without the need for a medium, is characteristic of which mode of heat transfer?
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Correct answer: B — Radiation
Radiation is the transfer of energy via electromagnetic waves (like infrared radiation), which does not require a medium.
Q7. The SI unit of specific heat capacity (C) is:
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Correct answer: B — J/kg K
Specific heat capacity is the amount of heat required to raise the temperature of a unit mass of a substance by one unit of temperature. The unit is Joules per kilogram per Kelvin (J/kg K).
Q8. Which mode of heat transfer does not require any medium of material movement?
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Correct answer: A — Radiation
Radiation is the transfer of heat via electromagnetic waves and does not depend on the movement of particles in a medium.
Q9. Thermal expansion of solids occurs because:
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Correct answer: D — The kinetic energy of the particles increases
When solids are heated, the particles gain kinetic energy, vibrate more vigorously, and move further apart, leading to an increase in volume (thermal expansion).
Q10. Which of the following is the primary mode of heat transfer in a vacuum?
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Correct answer: B — Radiation
Since there are no particles in a vacuum, heat transfer can only occur through radiation.
Q11. Which mode of heat transfer is solely dependent on the radiation of energy and does not require any medium for its propagation?
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Correct answer: C — Diffusion
Radiation is the mode of heat transfer that occurs via electromagnetic waves and does not depend on the movement of particles or any medium to propagate heat.
Q12. If two objects are in thermal equilibrium, what must be true regarding their temperatures?
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Correct answer: B — They must have the same temperature.
Thermal equilibrium is the state where two objects, or systems, are at the same temperature, and no net heat transfer occurs between them.
Q13. Which statement correctly describes the condition of thermal equilibrium?
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Correct answer: A — The objects have the same temperature.
Thermal equilibrium is achieved when the objects are in thermal contact and their temperatures are equal, meaning there is no net flow of heat between them.
Q14. If the temperature of a system increases, what happens to the kinetic energy of its molecules?
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Correct answer: D — It increases
The kinetic energy of molecules is directly proportional to the absolute temperature. An increase in temperature means an increase in the average kinetic energy of the molecules.
Q15. The property of a substance that measures the amount of heat required to raise the temperature of a unit mass by one degree is called:
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Correct answer: D — Specific Heat Capacity
Specific heat capacity (specific heat) is the measure of how much energy is needed to change the temperature of a substance.
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