Heat MCQs (391–420) with Answers and Explanations help students revise key formulas of heat, temperature scales, calorimetry, and thermal expansion through objective questions.
This Heat MCQ practice set is ideal for exam revision to improve speed, accuracy, and concept clarity in Heat chapter fundamentals.
391. Heat always flows from a body at:
Correct Answer: B
Heat naturally flows from higher temperature to lower temperature.
392. The SI unit of temperature is:
Correct Answer: D
Kelvin (K) is the SI unit of temperature.
393. The relation between Kelvin (K) and Celsius (°C) is:
Correct Answer: C
Kelvin value is obtained by adding 273 to Celsius.
394. Which of the following is NOT a mode of heat transfer?
Correct Answer: D
Refraction is related to light, not heat transfer.
395. Heat transfer through direct contact of particles is called:
Correct Answer: A
Conduction occurs due to particle-to-particle energy transfer.
396. Heat transfer by bulk movement of fluid is called:
Correct Answer: B
Convection happens due to movement of liquids or gases.
397. The heat transfer that can take place in vacuum is:
Correct Answer: C
Radiation transfers heat without any medium.
398. The unit of specific heat capacity is:
Correct Answer: B
Specific heat capacity unit is J/kgK (or J/kg°C).
399. The quantity of heat required to raise the temperature of 1 kg of a substance by 1°C is called:
Correct Answer: A
Specific heat refers to 1 kg mass with 1°C temperature rise.
400. The formula for heat gained or lost is:
Correct Answer: D
Heat energy depends on mass, specific heat, and temperature change.
401. The heat required to change a solid into liquid at constant temperature is called:
Correct Answer: B
Melting needs latent heat of fusion without temperature change.
402. The heat required to change a liquid into gas at constant temperature is called:
Correct Answer: D
Boiling uses latent heat of vaporization without raising temperature.
403. The boiling point of water increases when:
Correct Answer: C
Higher pressure raises the boiling point of liquids.
404. A pressure cooker works on the principle of:
Correct Answer: A
Pressure cooker increases pressure and thus raises boiling point.
405. The instrument used to measure very high temperatures is:
Correct Answer: B
Pyrometer is used to measure very high temperatures.
406. A bimetallic strip is used in:
Correct Answer: D
A thermostat uses a bimetallic strip due to different expansions.
407. The maximum density of water occurs at:
Correct Answer: C
Water has maximum density at 4°C.
408. Ice floats on water because:
Correct Answer: B
Ice has lower density, so it floats.
409. The anomalous expansion of water occurs between:
Correct Answer: A
Water expands on cooling below 4°C down to 0°C.
410. The best absorber and emitter of heat radiation is:
Correct Answer: D
Dull black surfaces absorb and emit heat radiation most effectively.
411. Shiny surfaces are used in thermos flasks to reduce heat loss by:
Correct Answer: C
Shiny surfaces reflect radiations and reduce heat loss.
412. The mode of heat transfer responsible for warming hands near a fire is mainly:
Correct Answer: D
Heat reaches hands mainly by radiation from the fire.
413. The blackening of the bottom of a cooking utensil helps in:
Correct Answer: A
Black surfaces absorb more radiant heat.
414. The process of heat transfer in which liquid particles rise up when heated is called:
Correct Answer: C
Heated fluid becomes lighter and rises, producing convection currents.
415. The phenomenon responsible for land breeze is:
Correct Answer: B
Unequal cooling produces convection currents leading to land breeze.
416. The temperature at which liquid changes to gas is called:
Correct Answer: D
Boiling point is the temperature for liquid to gas change.
417. The temperature at which solid changes into liquid is called:
Correct Answer: A
Melting point is the temperature where solid becomes liquid.
418. The heat required to convert 1 kg of water at 100°C into steam at 100°C is called:
Correct Answer: C
Vaporization needs latent heat without temperature change.
419. The heat required to convert 1 kg of ice at 0°C into water at 0°C is called:
Correct Answer: B
Fusion is melting of ice to water at constant temperature.
420. The process of changing solid directly into gas is called:
Correct Answer: D
Sublimation is direct change from solid to gas.
Heat MCQs (391–420) FAQs
1. What topics are covered in Heat MCQs (391–420)?
This set covers temperature scales, heat transfer methods, calorimetry formulas, latent heat, and real-life applications.
2. Are these Heat MCQs useful for competitive exams?
Yes, these objective questions help strengthen fundamental Heat concepts often asked in competitive tests.
3. Do these Heat MCQs include answers with explanations?
Yes, each question includes the correct answer along with a short explanation for quick revision.
4. How can students score better using Heat MCQs?
Regular MCQ practice improves accuracy, reduces mistakes, and builds confidence for exams.
5. What should be revised after solving this Heat MCQ set?
Review explanations and revise weak areas such as radiation properties and latent heat concepts.
This set covers temperature scales, heat transfer methods, calorimetry formulas, latent heat, and real-life applications.
2. Are these Heat MCQs useful for competitive exams?
Yes, these objective questions help strengthen fundamental Heat concepts often asked in competitive tests.
3. Do these Heat MCQs include answers with explanations?
Yes, each question includes the correct answer along with a short explanation for quick revision.
4. How can students score better using Heat MCQs?
Regular MCQ practice improves accuracy, reduces mistakes, and builds confidence for exams.
5. What should be revised after solving this Heat MCQ set?
Review explanations and revise weak areas such as radiation properties and latent heat concepts.
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