Heat MCQs (61–90) with Answers and Explanations provide important objective questions for Heat chapter revision.
This set focuses on thermal expansion, temperature scales, latent heat, specific heat, and everyday applications of heat transfer.
61. The expansion of solids on heating is generally:
Correct Answer: C
Solids expand on heating, but the expansion is usually small.
62. The expansion of liquids is measured by:
Correct Answer: B
Liquids expand in volume, so cubical expansion is used.
63. The expansion of gases is:
Correct Answer: D
Gases expand the most on heating compared to solids and liquids.
64. The coefficient of linear expansion is measured in:
Correct Answer: A
Coefficient of linear expansion is change per unit length per °C.
65. Railway tracks are laid with gaps to:
Correct Answer: B
Gaps prevent bending or buckling due to thermal expansion.
66. A bimetallic strip is used in:
Correct Answer: C
Bimetallic strips bend due to unequal expansion and work in thermostats.
67. The coefficient of expansion is maximum in:
Correct Answer: D
Gases have the highest coefficient of expansion.
68. Water shows maximum density at:
Correct Answer: A
Water has maximum density at 4°C.
69. Due to anomalous expansion of water:
Correct Answer: B
Water expands when cooled from 4°C to 0°C (anomalous expansion).
70. The phenomenon of heat transfer from one point to another without movement of particles is:
Correct Answer: A
Conduction happens without bulk movement of particles.
71. Thermal insulation reduces heat transfer mainly by:
Correct Answer: C
Insulators slow down heat flow by conduction and convection.
72. The heat transfer through vacuum occurs by:
Correct Answer: B
Radiation is the only mode of heat transfer in vacuum.
73. The unit of heat in CGS system is:
Correct Answer: A
Calorie is the unit of heat in CGS system.
74. 1 calorie is equal to:
Correct Answer: B
1 calorie is approximately equal to 4.2 joules.
75. The appliance used to prevent overheating in electric circuits is:
Correct Answer: D
Fuse protects circuits by breaking the circuit when current is high.
76. The best material for handles of cooking utensils is:
Correct Answer: C
Bakelite is a poor conductor of heat and is safe for handles.
77. A pressure cooker cooks food faster because:
Correct Answer: B
Higher pressure raises boiling point, cooking food faster.
78. The color of a good absorber of heat radiation is:
Correct Answer: D
Black surfaces absorb radiant heat efficiently.
79. The color of a good reflector of heat is:
Correct Answer: B
Shiny surfaces reflect maximum heat radiation.
80. The heat transfer in solids is mainly due to:
Correct Answer: A
In solids, heat conduction occurs through particle vibrations and electrons.
81. When a body cools down, it:
Correct Answer: C
Most substances contract on cooling due to reduced molecular motion.
82. The heat energy released during freezing is called:
Correct Answer: B
During freezing, latent heat of fusion is released.
83. A thermometer should have a very thin glass bulb because:
Correct Answer: D
A thin bulb responds quickly to small temperature changes.
84. The transfer of heat in liquids occurs mainly by:
Correct Answer: B
Liquids transfer heat mainly through convection currents.
85. The transfer of heat in air is due to:
Correct Answer: C
Air transfers heat mainly through convection currents.
86. The process of changing liquid to gas below boiling point is:
Correct Answer: A
Evaporation occurs at any temperature below boiling point.
87. The rate of evaporation increases when:
Correct Answer: D
Higher wind speed removes vapor faster, increasing evaporation.
88. The phenomenon of cooling caused by evaporation is used in:
Correct Answer: B
Desert coolers cool air due to evaporation of water.
89. The unit of coefficient of cubical expansion is:
Correct Answer: A
Expansion coefficients are measured per degree temperature change.
90. Thermal expansion is used in:
Correct Answer: C
Thermal expansion is used in thermometers and thermostats.
Heat MCQs (61–90) FAQs
1. What topics are included in Heat MCQs (61–90)?
This set includes thermal expansion, anomalous expansion of water, evaporation, and radiation-based concepts.
2. Are these Heat MCQs helpful for school exams?
Yes, these MCQs support quick revision and help students prepare for objective questions in exams.
3. Do these questions include answers with explanations?
Yes, each question has the correct answer and a short explanation for better understanding.
4. Can these MCQs help in competitive exam preparation?
Yes, the set is useful for basic physics objective practice for competitive tests as well.
5. What is the best way to revise Heat chapter using MCQs?
Practice daily, review explanations, and repeat weak concepts like conduction, convection, and radiation.
This set includes thermal expansion, anomalous expansion of water, evaporation, and radiation-based concepts.
2. Are these Heat MCQs helpful for school exams?
Yes, these MCQs support quick revision and help students prepare for objective questions in exams.
3. Do these questions include answers with explanations?
Yes, each question has the correct answer and a short explanation for better understanding.
4. Can these MCQs help in competitive exam preparation?
Yes, the set is useful for basic physics objective practice for competitive tests as well.
5. What is the best way to revise Heat chapter using MCQs?
Practice daily, review explanations, and repeat weak concepts like conduction, convection, and radiation.
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