Heat MCQs (181–210) with Answers and Explanations help students practice important objective questions for Heat chapter revision.
This set covers calorimetry basics, temperature conversion, thermal conductivity, and practical applications of heat transfer.
181. The amount of heat needed to raise the temperature of 1 kg of a substance by 1°C is called:
Correct Answer: A
Specific heat capacity is the heat required for 1 kg mass for 1°C rise.
182. The heat required to change 1 kg of ice at 0°C into water at 0°C is called:
Correct Answer: B
Melting ice needs latent heat of fusion without changing temperature.
183. The heat required to convert 1 kg of water at 100°C into steam at 100°C is called:
Correct Answer: C
Boiling requires latent heat of vaporization at constant temperature.
184. The heat transfer mechanism mainly involved in heating a metal rod from one end is:
Correct Answer: A
In solids like metals, heat travels mostly by conduction.
185. The heat transfer mechanism mainly involved in boiling water is:
Correct Answer: B
Hot water rises and cold water sinks forming convection currents.
186. The heat transfer mechanism responsible for heat from fire reaching a person is:
Correct Answer: C
Radiation transfers heat without direct contact.
187. A shiny surface reduces heat loss mainly by:
Correct Answer: D
Shiny surfaces reflect heat rays and reduce radiation loss.
188. A dull black surface is a good:
Correct Answer: B
Black dull surfaces absorb and emit heat radiation effectively.
189. The unit of thermal conductivity is:
Correct Answer: C
Thermal conductivity is measured in W/mK in SI units.
190. The best conductor of heat among the following is:
Correct Answer: D
Copper is a good conductor of heat compared to non-metals.
191. The poor conductor of heat is:
Correct Answer: A
Wood is an insulator and does not conduct heat well.
192. The best material used for the handles of cooking utensils is:
Correct Answer: C
Bakelite is a poor conductor of heat, so it remains cool.
193. The rate of evaporation increases when:
Correct Answer: B
Higher wind removes water vapor faster, increasing evaporation.
194. Sweating cools the body mainly due to:
Correct Answer: A
Sweat evaporates by taking heat from the body, causing cooling.
195. The phenomenon of water expanding on cooling from 4°C to 0°C is called:
Correct Answer: D
Water shows unusual expansion below 4°C, known as anomalous expansion.
196. The coefficient of linear expansion is measured in:
Correct Answer: B
Expansion coefficients are measured per degree temperature change.
197. The expansion of gases for the same rise in temperature is:
Correct Answer: C
Gases show the maximum thermal expansion compared to solids and liquids.
198. In a pressure cooker, food cooks faster because:
Correct Answer: A
Higher pressure raises boiling point, so cooking occurs at higher temperature.
199. The transfer of heat through a liquid mainly occurs by:
Correct Answer: B
Liquids transfer heat mainly through convection currents.
200. The process of changing liquid into gas at all temperatures is:
Correct Answer: D
Evaporation happens at the surface below boiling point too.
201. The heating effect of Sunlight reaching Earth is an example of:
Correct Answer: C
Solar heat comes to Earth through radiation.
202. The surface which absorbs maximum heat radiation is:
Correct Answer: B
Dull black surfaces are the best absorbers of radiant heat.
203. The surface which reflects maximum heat radiation is:
Correct Answer: A
Polished silver surfaces reflect the most heat radiation.
204. In a thermos flask, vacuum prevents heat transfer by:
Correct Answer: B
Vacuum removes medium, stopping conduction and convection.
205. The silver coating in thermos flask reduces heat loss by:
Correct Answer: D
Silvered surfaces reflect heat rays and reduce radiation losses.
206. Heat transfer in gases mainly occurs by:
Correct Answer: B
Gases transfer heat mainly through convection currents.
207. The SI unit of latent heat is:
Correct Answer: C
Latent heat is energy per unit mass, so its unit is J/kg.
208. The hotness or coldness of a body is measured by:
Correct Answer: D
Temperature indicates how hot or cold a body is.
209. Sea breeze occurs during day because:
Correct Answer: A
Land becomes hotter, air rises, and cool air from sea moves toward land.
210. Land breeze occurs at night because:
Correct Answer: B
At night land cools faster, so air flows from land to sea.
Heat MCQs (181–210) FAQs
1. What topics are covered in Heat MCQs (181–210)?
This set covers latent heat, specific heat capacity, calorimetry basics, and methods of heat transfer with applications.
2. Are these Heat MCQs helpful for competitive exams?
Yes, these MCQs improve conceptual clarity and objective practice for many science-based exams.
3. Do these MCQs include answers with short explanations?
Yes, each question contains the correct option and a brief explanation for quick revision.
4. How can students use Heat MCQs for exam preparation?
Practice regularly, review explanations, and revise weak topics like radiation and calorimetry repeatedly.
5. Which Heat concepts should be studied along with this MCQ set?
Students should revise temperature scales, heat transfer modes, and latent heat for better overall understanding.
This set covers latent heat, specific heat capacity, calorimetry basics, and methods of heat transfer with applications.
2. Are these Heat MCQs helpful for competitive exams?
Yes, these MCQs improve conceptual clarity and objective practice for many science-based exams.
3. Do these MCQs include answers with short explanations?
Yes, each question contains the correct option and a brief explanation for quick revision.
4. How can students use Heat MCQs for exam preparation?
Practice regularly, review explanations, and revise weak topics like radiation and calorimetry repeatedly.
5. Which Heat concepts should be studied along with this MCQ set?
Students should revise temperature scales, heat transfer modes, and latent heat for better overall understanding.
.png)
Post a Comment