Heat MCQs (271–300) with Answers and Explanations help students strengthen concepts like calorimetry, latent heat, and heat transfer in an exam-focused way.
This objective practice set is useful for school exams and competitive exams to revise important Heat chapter fundamentals quickly.
271. The SI unit of heat is:
Correct Answer: C
Joule (J) is the SI unit of heat and energy.
272. The heat required to raise the temperature of a body depends on:
Correct Answer: D
Heat gained/lost is given by Q = m × c × ΔT.
273. Which of the following has the highest specific heat capacity?
Correct Answer: A
Water has high specific heat capacity, so it heats and cools slowly.
274. The heat required to change a solid into liquid at constant temperature is called:
Correct Answer: B
Melting requires latent heat of fusion without changing temperature.
275. The heat required to change liquid into gas at constant temperature is called:
Correct Answer: C
Boiling needs latent heat of vaporization at constant temperature.
276. Heat transfer in solids mainly occurs by:
Correct Answer: A
Conduction transfers heat through direct contact in solids.
277. Heat transfer in liquids and gases mainly occurs by:
Correct Answer: B
Convection is heat transfer by movement of fluid particles.
278. The mode of heat transfer that does not require a medium is:
Correct Answer: D
Radiation transfers heat through vacuum without any material medium.
279. A dull black surface is the best:
Correct Answer: C
Dull black surfaces absorb and emit heat radiation efficiently.
280. A shiny surface reduces heat loss mainly by:
Correct Answer: B
Shiny surfaces reflect radiant heat and reduce radiation loss.
281. The boiling point of water at normal pressure is:
Correct Answer: A
Water boils at 100°C at 1 atm pressure.
282. The melting point of ice is:
Correct Answer: D
Ice melts at 0°C under normal atmospheric pressure.
283. Absolute zero temperature is approximately:
Correct Answer: B
Absolute zero is nearly −273°C or 0 K.
284. The relation between Celsius and Kelvin scale is:
Correct Answer: C
Kelvin temperature is obtained by adding 273 to Celsius value.
285. The Celsius and Fahrenheit scales coincide at:
Correct Answer: A
At −40°C, the Fahrenheit value is also −40°F.
286. Sea breeze blows from sea to land during the day because:
Correct Answer: B
Hot air over land rises and cooler air from sea moves towards land.
287. Land breeze blows from land to sea at night because:
Correct Answer: C
At night land becomes cooler, so air flows from land to sea.
288. Water is used in radiators because it has:
Correct Answer: D
Water absorbs large heat with small temperature rise.
289. The maximum density of water occurs at:
Correct Answer: A
Water has maximum density at 4°C due to anomalous expansion.
290. The phenomenon of water expanding below 4°C is called:
Correct Answer: C
Below 4°C water expands on cooling, which is anomalous expansion.
291. The best conductor of heat is:
Correct Answer: D
Silver is the best conductor of heat among the given options.
292. The best insulator of heat is:
Correct Answer: B
Air is a poor conductor and is used for insulation.
293. In a thermos flask, vacuum prevents heat transfer by:
Correct Answer: C
Vacuum has no medium, so conduction and convection do not occur.
294. The silver coating in a thermos flask reduces heat transfer by:
Correct Answer: D
Silvered surfaces reflect heat rays and reduce radiation losses.
295. The rate of evaporation increases when:
Correct Answer: C
Wind removes water vapour quickly, increasing evaporation.
296. Sweating cools the body mainly because of:
Correct Answer: A
Evaporation of sweat takes heat from the body, causing cooling.
297. The mode of heat transfer that involves actual movement of particles is:
Correct Answer: B
Convection transfers heat through movement of fluid particles.
298. The mode of heat transfer that occurs fastest is:
Correct Answer: C
Radiation travels as electromagnetic waves and is fastest.
299. The thermal conductivity of a material depends on:
Correct Answer: D
Thermal conductivity is a property that depends on the material type.
300. The heat transfer rate is maximum when the temperature difference is:
Correct Answer: A
Greater temperature difference causes faster heat transfer.
Heat MCQs (271–300) FAQs
1. What topics are covered in Heat MCQs (271–300)?
This set covers calorimetry, latent heat, temperature scales, thermal properties, and heat transfer applications.
2. Are these Heat MCQs useful for Class 8, 9, and 10 students?
Yes, these questions help in school exam preparation and chapter revision for Heat basics.
3. Do these Heat MCQs include answers with explanations?
Yes, each question has the correct option and a short explanation for concept clarity.
4. How do these Heat MCQs help in competitive exam preparation?
Regular practice improves objective accuracy and strengthens understanding of core heat concepts.
5. What is the best way to practice Heat MCQs daily?
Solve all questions, review explanations, and repeat practice of weak topics like radiation and calorimetry.
This set covers calorimetry, latent heat, temperature scales, thermal properties, and heat transfer applications.
2. Are these Heat MCQs useful for Class 8, 9, and 10 students?
Yes, these questions help in school exam preparation and chapter revision for Heat basics.
3. Do these Heat MCQs include answers with explanations?
Yes, each question has the correct option and a short explanation for concept clarity.
4. How do these Heat MCQs help in competitive exam preparation?
Regular practice improves objective accuracy and strengthens understanding of core heat concepts.
5. What is the best way to practice Heat MCQs daily?
Solve all questions, review explanations, and repeat practice of weak topics like radiation and calorimetry.
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