Heat MCQs (211–240) with Answers and Explanations help students revise key concepts like thermal expansion, temperature scales, and heat transfer.
This practice set is useful for school exams and competitive exams to improve accuracy in objective questions from the Heat chapter.
211. The SI unit of heat capacity is:
Correct Answer: C
Heat capacity is measured as heat needed per degree temperature rise.
212. Which material has the highest specific heat capacity?
Correct Answer: B
Water has a very high specific heat capacity, so it heats slowly.
213. The phenomenon of increase in length due to heat is called:
Correct Answer: A
Linear expansion means change in length due to temperature rise.
214. The expansion in area due to rise in temperature is called:
Correct Answer: B
Areal expansion refers to increase in surface area.
215. The expansion in volume due to heat is called:
Correct Answer: C
Cubical expansion means increase in volume due to heating.
216. Railway tracks are provided with gaps to allow:
Correct Answer: D
Gaps prevent bending or breaking due to thermal expansion.
217. The expansion of liquids is usually measured by:
Correct Answer: B
Liquids expand in volume, so cubical expansion is used.
218. The coefficient of expansion is maximum for:
Correct Answer: C
Gases expand the most for the same temperature rise.
219. The Celsius and Fahrenheit scales are equal at:
Correct Answer: A
At −40°, the Celsius and Fahrenheit readings are the same.
220. The normal temperature of the human body is:
Correct Answer: B
Average normal body temperature is approximately 37°C.
221. The instrument used to measure very high temperature is:
Correct Answer: D
Pyrometer is used to measure very high temperatures.
222. In which mode of heat transfer, the medium is not required?
Correct Answer: C
Radiation can transfer heat through vacuum, so no medium is needed.
223. The best absorber of heat radiation is:
Correct Answer: B
Black surfaces absorb maximum radiant heat.
224. The best reflector of heat radiation is:
Correct Answer: A
Polished surfaces reflect heat rays and reduce radiation loss.
225. The process by which a liquid changes into vapor at any temperature is:
Correct Answer: D
Evaporation occurs at the surface even below boiling point.
226. The boiling point of water increases when:
Correct Answer: B
Higher pressure raises the boiling point, as in a pressure cooker.
227. The hot air rises upward because it becomes:
Correct Answer: C
Hot air expands, density decreases, so it rises.
228. Sea breeze occurs due to:
Correct Answer: B
Convection currents form due to unequal heating of land and sea.
229. The coefficient of expansion is generally least for:
Correct Answer: A
Solids expand the least compared to liquids and gases.
230. The substance used in thermometers commonly is:
Correct Answer: B
Mercury expands uniformly and is visible, so it is used in thermometers.
231. The temperature on Kelvin scale is related to Celsius by:
Correct Answer: D
Kelvin temperature is obtained by adding 273 to Celsius value.
232. Which of the following is NOT a mode of heat transfer?
Correct Answer: D
Refraction is related to light, not heat transfer.
233. Heat energy flows from:
Correct Answer: A
Heat always flows naturally from hot body to cold body.
234. The rate of heat transfer by conduction depends on:
Correct Answer: B
Conduction depends on thermal conductivity, area, thickness and ΔT.
235. The phenomenon of cooling by evaporation is faster when:
Correct Answer: C
Larger surface area increases evaporation rate and cooling effect.
236. The conversion of steam into water is called:
Correct Answer: D
Condensation is the change from gas to liquid.
237. The conversion of water into ice is called:
Correct Answer: B
Freezing changes liquid water into solid ice.
238. Which type of expansion is important in bridges?
Correct Answer: A
Bridges expand in length, so linear expansion is important.
239. The device used to measure heat radiation intensity is:
Correct Answer: C
A bolometer measures radiant energy by detecting temperature rise.
240. The process of heat transfer responsible for formation of wind is:
Correct Answer: B
Uneven heating causes convection currents leading to wind movement.
Heat MCQs (211–240) FAQs
1. What topics are covered in Heat MCQs (211–240)?
This set includes thermal expansion, temperature conversion, heat transfer modes, and calorimetry fundamentals.
2. Are these Heat MCQs useful for Class 8, 9, and 10 students?
Yes, the questions are suitable for school-level Heat chapter preparation and revision.
3. Do these Heat MCQs contain answers and explanations?
Yes, every MCQ has the correct answer and a short explanation for quick understanding.
4. How do these Heat MCQs help students in exams?
Regular practice improves concept clarity, speed, and accuracy in objective questions.
5. What is the best way to practice this Heat MCQ set?
Solve all questions, review explanations, and repeat practice for weak topics like expansion and radiation.
This set includes thermal expansion, temperature conversion, heat transfer modes, and calorimetry fundamentals.
2. Are these Heat MCQs useful for Class 8, 9, and 10 students?
Yes, the questions are suitable for school-level Heat chapter preparation and revision.
3. Do these Heat MCQs contain answers and explanations?
Yes, every MCQ has the correct answer and a short explanation for quick understanding.
4. How do these Heat MCQs help students in exams?
Regular practice improves concept clarity, speed, and accuracy in objective questions.
5. What is the best way to practice this Heat MCQ set?
Solve all questions, review explanations, and repeat practice for weak topics like expansion and radiation.
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