Heat MCQs (481–500) with Answers and Explanations help students practice important objective questions on thermal conductivity, heat transfer methods, and calorimetry basics.
This 20-question Heat MCQ set is useful for school and competitive exams to revise core Heat chapter concepts with quick explanations.
481. The heat transfer rate by conduction is maximum in:
Correct Answer: D
Copper is a very good conductor, so conduction is maximum.
482. Thermal conductivity is measured in:
Correct Answer: B
Thermal conductivity unit is W/mK.
483. Which of the following is a good insulator of heat?
Correct Answer: C
Thermocol is a poor conductor, so it acts as an insulator.
484. Heat transfer in a vacuum is possible only by:
Correct Answer: A
Radiation does not require any medium, so it occurs in vacuum.
485. The rate of heat conduction increases when the area is:
Correct Answer: D
Larger cross-sectional area allows more heat flow per unit time.
486. The rate of heat conduction decreases when the length of the conductor is:
Correct Answer: B
Longer length increases the path, reducing heat flow rate.
487. Convection occurs mainly in:
Correct Answer: C
Convection needs fluid motion, so it occurs in liquids and gases.
488. Dark and dull surfaces are good:
Correct Answer: D
Dull black surfaces absorb and emit radiation efficiently.
489. Shiny surfaces are good:
Correct Answer: B
Shiny polished surfaces reflect radiant heat well.
490. The device that reduces heat loss using vacuum is:
Correct Answer: C
Thermos flask uses vacuum to stop conduction and convection.
491. The silvered walls in a thermos flask reduce heat transfer by:
Correct Answer: D
Silvered surfaces reflect radiations, reducing heat loss by radiation.
492. Heat energy transferred per unit time is called:
Correct Answer: A
Energy transfer per unit time is power (J/s).
493. 0°C is equal to:
Correct Answer: B
0°C corresponds to approximately 273 K.
494. 100°C is equal to:
Correct Answer: D
100°C corresponds to approximately 373 K.
495. The boiling point of water at 1 atm is:
Correct Answer: C
Water boils at 100°C at normal atmospheric pressure.
496. The melting point of ice at 1 atm is:
Correct Answer: A
Ice melts at 0°C under normal pressure.
497. The process of changing solid directly into gas is:
Correct Answer: B
Sublimation is direct change from solid to gas.
498. The process of changing gas into liquid is called:
Correct Answer: C
Condensation changes gas (vapour) into liquid.
499. The process of changing liquid into gas at boiling point is called:
Correct Answer: D
Vaporization is liquid to gas at boiling point.
500. The phenomenon responsible for sea breeze is:
Correct Answer: B
Sea breeze occurs due to convection currents caused by unequal heating.
Heat MCQs (481–500) FAQs
1. What topics are covered in Heat MCQs (481–500)?
This set covers thermal conductivity, modes of heat transfer, radiation properties, thermos flask working, and basic temperature conversions.
2. Why is this Heat MCQ set useful for students?
It improves objective practice and strengthens core Heat chapter concepts for exams.
3. Do these Heat MCQs include answers with explanations?
Yes, every question has the correct answer and a short explanation for quick revision.
4. How can students use these MCQs for revision?
Solve all questions, review explanations, and repeat practice for better accuracy and speed.
5. Which Heat topics should be revised after this set?
Revise conduction formula factors, radiation surface properties, and conversion formulas between Kelvin and Celsius.
This set covers thermal conductivity, modes of heat transfer, radiation properties, thermos flask working, and basic temperature conversions.
2. Why is this Heat MCQ set useful for students?
It improves objective practice and strengthens core Heat chapter concepts for exams.
3. Do these Heat MCQs include answers with explanations?
Yes, every question has the correct answer and a short explanation for quick revision.
4. How can students use these MCQs for revision?
Solve all questions, review explanations, and repeat practice for better accuracy and speed.
5. Which Heat topics should be revised after this set?
Revise conduction formula factors, radiation surface properties, and conversion formulas between Kelvin and Celsius.
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