Heat MCQs (151–180) with Answers and Explanations are useful for exam-oriented practice of Heat chapter objective questions.
This MCQ set includes calorimetry numericals, thermal conductivity, radiation properties, and temperature conversion concepts.
151. The heat required to raise the temperature of a body by 1°C is called:
Correct Answer: C
Heat capacity is the heat needed to raise temperature of a body by 1°C.
152. Specific heat capacity is the heat required to raise the temperature of 1 kg substance by:
Correct Answer: B
Specific heat is defined for 1 kg mass and 1°C rise in temperature.
153. Heat capacity depends on:
Correct Answer: D
Heat capacity is given by C = m × c.
154. Which of the following has the highest thermal conductivity?
Correct Answer: C
Silver conducts heat best among common materials.
155. The process of changing solid directly into gas is called:
Correct Answer: B
Sublimation is a direct change from solid state to gaseous state.
156. The phenomenon of cooling caused by evaporation depends on:
Correct Answer: A
Evaporation absorbs latent heat of vaporization and causes cooling.
157. The temperature at which water boils at normal pressure is:
Correct Answer: D
At 1 atm pressure, water boils at 100°C.
158. The temperature at which ice melts is:
Correct Answer: B
Ice melts at 0°C under normal conditions.
159. Water has maximum density at:
Correct Answer: A
Water shows maximum density at 4°C (anomalous behavior).
160. The principle of a thermometer is based on:
Correct Answer: C
Liquids expand with temperature and this is used in thermometers.
161. Which color surface is the best emitter of heat?
Correct Answer: D
Dull black surfaces emit heat radiation strongly.
162. The best reflector of radiant heat is:
Correct Answer: B
Shiny polished surfaces reflect heat radiation well.
163. The heat transfer through metals occurs mainly by:
Correct Answer: A
Metals transfer heat mainly by conduction.
164. The air between wool fibers acts as:
Correct Answer: C
Trapped air is a poor conductor of heat, so it prevents heat loss.
165. A thermos flask uses vacuum to prevent:
Correct Answer: B
Vacuum eliminates medium, reducing conduction and convection.
166. The silver coating in a thermos flask reduces:
Correct Answer: D
Silvered surfaces reflect heat and reduce radiation losses.
167. The mode of heat transfer in boiling water is:
Correct Answer: B
Boiling creates convection currents, transferring heat in liquid.
168. The mode of heat transfer in metal spoon kept in hot tea is:
Correct Answer: A
Heat moves through the spoon by conduction.
169. The heat transfer responsible for warmth felt near a fire is:
Correct Answer: C
Radiant heat from fire travels through air without contact.
170. The coefficient of linear expansion is related to:
Correct Answer: B
Linear expansion coefficient measures change in length per degree rise.
Heat MCQs (151–180) FAQs
1. What topics are covered in Heat MCQs (151–180)?
This set includes heat capacity, specific heat, latent heat, thermal conductivity, evaporation, and radiation-based concepts.
2. Are these Heat MCQs good for school and competitive exam practice?
Yes, they strengthen basic heat concepts for objective-type questions in various exams.
3. Do these questions include answers and short explanations?
Yes, each MCQ includes the correct answer with a brief explanation for quick revision.
4. How do Heat MCQs improve exam performance?
Regular practice improves accuracy, helps revise formulas, and boosts confidence in the Heat chapter.
5. Which Heat topics should be revised along with this set?
Students should revise heat transfer, temperature scales, and calorimetry for better understanding.
This set includes heat capacity, specific heat, latent heat, thermal conductivity, evaporation, and radiation-based concepts.
2. Are these Heat MCQs good for school and competitive exam practice?
Yes, they strengthen basic heat concepts for objective-type questions in various exams.
3. Do these questions include answers and short explanations?
Yes, each MCQ includes the correct answer with a brief explanation for quick revision.
4. How do Heat MCQs improve exam performance?
Regular practice improves accuracy, helps revise formulas, and boosts confidence in the Heat chapter.
5. Which Heat topics should be revised along with this set?
Students should revise heat transfer, temperature scales, and calorimetry for better understanding.
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