Heat MCQs (361–390) with Answers and Explanations help students practice important objective questions on heat transfer, thermal conductivity, and temperature conversion formulas.
This practice set is useful for school exams and competitive exams to revise Heat chapter concepts like conduction, convection, radiation, and latent heat.
361. The physical quantity that determines the direction of heat flow is:
Correct Answer: B
Heat flows from higher temperature to lower temperature.
362. Heat transfer in solids occurs mainly due to:
Correct Answer: A
In solids, heat is transferred by conduction through particle collisions.
363. Which of the following is a good conductor of heat?
Correct Answer: D
Copper is a metal and conducts heat efficiently.
364. Which of the following is the poorest conductor of heat?
Correct Answer: B
Air is a poor conductor and works as an insulator.
365. The rate of heat conduction is directly proportional to:
Correct Answer: C
Larger area allows more heat to flow per unit time.
366. The rate of heat conduction is inversely proportional to:
Correct Answer: A
Rate decreases when length increases because heat path becomes longer.
367. Heat transfer by convection is possible in:
Correct Answer: D
Convection happens in fluids because particles can move freely.
368. Convection current is produced because heated fluid becomes:
Correct Answer: B
Heated fluid expands, becomes less dense, and rises upward.
369. The sea breeze is caused due to:
Correct Answer: C
Convection currents form due to unequal heating of land and sea.
370. Heat transfer by radiation depends mainly on:
Correct Answer: A
Dark and dull surfaces absorb and emit heat more effectively.
371. The best absorber of radiant heat is:
Correct Answer: D
Dull black surfaces absorb maximum heat radiation.
372. The best reflector of radiant heat is:
Correct Answer: B
Shiny polished surfaces reflect radiant heat effectively.
373. Which of the following is the best emitter of heat?
Correct Answer: C
Dull black surfaces emit heat radiation best.
374. The device that prevents heat transfer by conduction and convection using vacuum is:
Correct Answer: D
Thermos flask uses vacuum to stop conduction and convection.
375. The silver coating inside a thermos flask reduces heat loss by:
Correct Answer: B
Silvered surfaces reflect heat rays, reducing radiation loss.
376. The temperature of a boiling liquid remains constant because:
Correct Answer: C
Supplied heat is used to change state, not to increase temperature.
377. Which factor increases the rate of evaporation?
Correct Answer: D
Wind removes vapour, increasing evaporation rate.
378. Evaporation causes cooling because:
Correct Answer: A
Fast molecules escape, taking latent heat and cooling the liquid.
379. Sweating cools the body mainly due to:
Correct Answer: B
Evaporation of sweat absorbs heat from the body.
380. The SI unit of specific heat capacity is:
Correct Answer: C
Specific heat capacity is heat per kg per degree rise (J/kgK).
381. The SI unit of latent heat is:
Correct Answer: D
Latent heat is heat per unit mass, so its unit is J/kg.
382. The latent heat of fusion is the heat required to:
Correct Answer: A
Fusion refers to melting (solid to liquid) without temperature change.
383. Water has maximum density at:
Correct Answer: C
Water shows maximum density at 4°C.
384. The anomalous expansion of water occurs between:
Correct Answer: B
Water expands on cooling below 4°C till 0°C.
385. Ice floats on water because:
Correct Answer: D
Ice has lower density, so it floats on water.
386. The conversion formula from Celsius (C) to Kelvin (K) is:
Correct Answer: A
Kelvin temperature is obtained by adding 273 to Celsius value.
387. The formula to convert Celsius (C) to Fahrenheit (F) is:
Correct Answer: C
Celsius to Fahrenheit conversion uses F = (9/5)C + 32.
388. The freezing point of water is:
Correct Answer: B
Water freezes at 0°C at normal atmospheric pressure.
389. The boiling point of water at 1 atm is:
Correct Answer: D
Water boils at 100°C under normal atmospheric pressure.
390. Heat is measured in:
Correct Answer: A
Heat is a form of energy and its SI unit is Joule.
Heat MCQs (361–390) FAQs
1. What topics are covered in Heat MCQs (361–390)?
This set covers heat transfer modes, thermal conductivity, evaporation effects, and temperature conversions.
2. Are these Heat MCQs helpful for board exams?
Yes, the questions improve understanding of concepts frequently asked in school exams.
3. Do these Heat MCQs include answers with explanations?
Yes, each MCQ contains the correct answer and a short explanation for fast revision.
4. How do these Heat MCQs help students in competitive exams?
They build strong fundamentals and improve objective question-solving accuracy.
5. What is the best way to practice this Heat MCQ set?
Attempt all questions, check explanations, and revise weak concepts regularly.
This set covers heat transfer modes, thermal conductivity, evaporation effects, and temperature conversions.
2. Are these Heat MCQs helpful for board exams?
Yes, the questions improve understanding of concepts frequently asked in school exams.
3. Do these Heat MCQs include answers with explanations?
Yes, each MCQ contains the correct answer and a short explanation for fast revision.
4. How do these Heat MCQs help students in competitive exams?
They build strong fundamentals and improve objective question-solving accuracy.
5. What is the best way to practice this Heat MCQ set?
Attempt all questions, check explanations, and revise weak concepts regularly.
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