Heat MCQs (31–60) with Answers and Explanations help students revise important Physics Heat chapter topics for exams.
This practice set covers key concepts such as temperature scales, specific heat capacity, latent heat, and heat transfer methods.
31. The relation between Celsius and Kelvin scale is:
Correct Answer: B
Kelvin temperature equals Celsius temperature plus 273 (approx.).
32. The relation between Fahrenheit and Celsius is:
Correct Answer: C
Fahrenheit scale is related to Celsius by °F = (9/5)°C + 32.
33. Normal human body temperature is approximately:
Correct Answer: A
The average human body temperature is about 37°C.
34. Heat capacity depends on:
Correct Answer: B
Heat capacity depends on mass and specific heat of the substance.
35. The formula for heat gained or lost is:
Correct Answer: C
Heat exchanged is given by Q = m × c × ΔT.
36. The amount of heat required to raise the temperature of 1 kg water by 1°C is:
Correct Answer: A
Specific heat of water is about 4200 J/kg°C.
37. A substance having high specific heat capacity is used as:
Correct Answer: B
Water has high specific heat, so it is commonly used as a coolant.
38. The process in which a solid directly changes into gas is called:
Correct Answer: C
Sublimation is solid changing directly into gas.
39. The SI unit of thermal conductivity is:
Correct Answer: D
Thermal conductivity is measured in W/mK.
40. The best conductor of heat among metals is:
Correct Answer: B
Silver has very high thermal conductivity.
41. The principle of a thermometer is based on:
Correct Answer: A
Most thermometers work on expansion of liquids with temperature.
42. The total energy of particles due to random motion is called:
Correct Answer: B
Thermal energy is due to random motion of particles.
43. Which of the following reduces heat loss by convection?
Correct Answer: C
Vacuum prevents convection as it has no medium.
44. Which of the following reduces heat loss by radiation?
Correct Answer: A
Shiny surfaces reflect heat radiation and reduce loss.
45. The heat transfer from cooker to food mainly occurs by:
Correct Answer: B
Heat conducts through vessel and convects through water/steam.
46. The instrument used to measure high temperature is:
Correct Answer: C
Pyrometer is used for measuring very high temperatures.
47. The temperature at which a substance changes from solid to liquid is:
Correct Answer: A
Melting point is when solid changes to liquid.
48. The temperature at which a liquid changes into gas is:
Correct Answer: B
Boiling point is the temperature for liquid to gas change.
49. The substance used in thermometers usually is:
Correct Answer: C
Thermometers often use mercury or colored alcohol.
50. The unit of latent heat is:
Correct Answer: D
Latent heat is energy per unit mass, measured in J/kg.
51. The heat required to melt a substance without changing temperature is:
Correct Answer: B
Fusion heat changes solid to liquid at constant temperature.
52. The heat required to convert liquid into gas at constant temperature is:
Correct Answer: A
Vaporization heat changes liquid to gas without temperature rise.
53. Which of the following is an example of convection?
Correct Answer: C
In boiling, hot water rises and cold water sinks forming convection currents.
54. Conduction is most effective in:
Correct Answer: A
Solids transfer heat best by conduction due to closely packed particles.
55. Radiation travels in the form of:
Correct Answer: B
Radiation is heat transfer through electromagnetic waves.
56. Which surface is the best emitter of heat?
Correct Answer: C
Black dull surfaces are good absorbers and emitters of heat.
57. Sea breeze and land breeze are caused by:
Correct Answer: A
Unequal heating creates convection currents leading to breezes.
58. A thermos flask reduces heat transfer mainly by:
Correct Answer: B
Vacuum reduces conduction/convection and silvering reduces radiation.
59. The quantity of heat needed to raise temperature of a body by 1°C is called:
Correct Answer: C
Heat capacity is heat needed for 1°C rise of the whole body.
60. Specific heat capacity is a property of:
Correct Answer: B
Specific heat depends on the nature of the material.
Heat MCQs (31–60) FAQs
1. What concepts are included in Heat MCQs (31–60)?
This set includes temperature conversion, specific heat capacity, latent heat, heat capacity, and methods of heat transfer.
2. Are these Heat MCQs useful for competitive exams?
Yes, these questions help in quick revision and objective practice for school exams and competitive tests.
3. Do these MCQs include answers with explanations?
Yes, every question has the correct option along with a short explanation for concept clarity.
4. Which chapters should I study along with Heat MCQs?
Along with Heat, students can revise Temperature, Thermal Expansion, and Heat Transfer topics for better understanding.
5. How can students score better using Heat MCQs practice?
Regular practice improves speed, strengthens fundamentals, and helps identify weak areas before exams.
This set includes temperature conversion, specific heat capacity, latent heat, heat capacity, and methods of heat transfer.
2. Are these Heat MCQs useful for competitive exams?
Yes, these questions help in quick revision and objective practice for school exams and competitive tests.
3. Do these MCQs include answers with explanations?
Yes, every question has the correct option along with a short explanation for concept clarity.
4. Which chapters should I study along with Heat MCQs?
Along with Heat, students can revise Temperature, Thermal Expansion, and Heat Transfer topics for better understanding.
5. How can students score better using Heat MCQs practice?
Regular practice improves speed, strengthens fundamentals, and helps identify weak areas before exams.
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