Heat MCQs (121–150) with Answers and Explanations help students practice important objective questions from the Heat chapter.
This practice set focuses on conduction, convection, radiation, calorimetry, and everyday applications of heat and temperature.
121. The SI unit of heat energy is:
Correct Answer: B
Heat is a form of energy, and its SI unit is Joule (J).
122. The unit of temperature in the SI system is:
Correct Answer: C
Kelvin (K) is the SI unit of temperature.
123. Heat transfer by direct contact is called:
Correct Answer: A
Conduction transfers heat through direct contact of particles.
124. Heat transfer by movement of fluid particles is called:
Correct Answer: B
Convection occurs in liquids and gases due to particle movement.
125. Heat transfer that does not require a medium is:
Correct Answer: C
Radiation can travel through vacuum, so no medium is needed.
126. The transfer of heat from Sun to Earth is mainly by:
Correct Answer: D
Solar energy reaches Earth through radiation in space.
127. The formula for heat is:
Correct Answer: B
Heat energy depends on mass, specific heat, and temperature change.
128. The unit of specific heat capacity is:
Correct Answer: A
Specific heat capacity is measured in J/kgK (or J/kg°C).
129. Specific heat capacity is heat required to raise temperature of:
Correct Answer: C
It is defined for unit mass (1 kg) and unit temperature rise (1°C).
130. The substance used as coolant because of high specific heat is:
Correct Answer: B
Water has high specific heat capacity, so it absorbs more heat.
131. The heat needed to change solid into liquid is:
Correct Answer: A
Fusion occurs during melting at constant temperature.
132. The heat needed to change liquid into gas is:
Correct Answer: B
Vaporization occurs at boiling point without temperature change.
133. The unit of latent heat is:
Correct Answer: D
Latent heat is measured as energy per unit mass (J/kg).
134. The unit of thermal conductivity is:
Correct Answer: B
Thermal conductivity is measured in W/mK in SI system.
135. The best conductor of heat is:
Correct Answer: C
Silver has the highest thermal conductivity among common metals.
136. A poor conductor of heat is:
Correct Answer: A
Wood is an insulator and a poor conductor of heat.
137. The best material for the handle of a cooker is:
Correct Answer: B
Bakelite is a poor conductor, making it safe for handles.
138. A pressure cooker cooks food faster because:
Correct Answer: C
High pressure raises boiling point, so cooking happens faster.
139. The process of changing liquid to gas at any temperature is:
Correct Answer: D
Evaporation occurs at the surface at temperatures below boiling point.
140. Cooling by evaporation is used in:
Correct Answer: A
Desert coolers work on cooling due to evaporation of water.
Heat MCQs (121–150) FAQs
1. What topics are included in Heat MCQs (121–150)?
This set includes heat transfer methods, calorimetry basics, specific heat, latent heat, and thermal conductivity.
2. Are these Heat MCQs useful for competitive exams?
Yes, these questions build strong fundamentals for objective-type physics exams.
3. Do these MCQs provide correct answers with explanations?
Yes, each MCQ includes the correct option and a short explanation for revision.
4. How can students revise Heat chapter quickly using this MCQ set?
Solve daily and review explanations to strengthen weak concepts like conduction and convection.
5. Which students should practice these Heat MCQs?
These questions are useful for school-level learners and basic science competitive preparation.
This set includes heat transfer methods, calorimetry basics, specific heat, latent heat, and thermal conductivity.
2. Are these Heat MCQs useful for competitive exams?
Yes, these questions build strong fundamentals for objective-type physics exams.
3. Do these MCQs provide correct answers with explanations?
Yes, each MCQ includes the correct option and a short explanation for revision.
4. How can students revise Heat chapter quickly using this MCQ set?
Solve daily and review explanations to strengthen weak concepts like conduction and convection.
5. Which students should practice these Heat MCQs?
These questions are useful for school-level learners and basic science competitive preparation.
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