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Sunday, 16 August 2026
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Physics Past Questions and Answers

Topic: Heat as a form of energy

Jamb Physics Questions - Heat as a form of energy

Question 1:
The following are some units i. Ns ii. Mm iii. Nm-2 iv. JoK-1. What are the units of latent heat?
  • A I
  • B Ii
  • C Iii
  • D Iv
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Question 2:
Heat may be transferred by conduction, convection and radiation. By which of these methods does heat travel through vacuum?
  • A Conduction only
  • B Convection only
  • C Radiation only
  • D Non of these methods
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Question 3:
What is the difference in the amount of heat given out by 4kg of steam and 4kg of water when both are cooled from 100oC to 80oC? [the specific latent heat of steam is 2,260,000Jkg-1, specific heat capacity of water is 4200Jkg-1K-1]
  • A 4200J
  • B 2,260,OOOJ
  • C 9,040,000J
  • D 9,380,000J
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Question 4:
An electric kettle with negligible heat capacity is rated at 2000W. If 2.0kg of water is put in it, how long will it take the temperature of water to rise from 20OC to 100OC? [specific heat capacity of water = 4200Jkg-1k-1]
  • A 420S
  • B 336S
  • C 168S
  • D 48S
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Question 5:
A piece of substance of specific head capacity 450JKg-1K-1 falls through a vertical distance of 20m from rest. Calculate the rise in temperature of the substance on hitting the ground when all its energies are converted into heat. [g = 10ms-2]
  • A 2/9°C
  • B 4/9°C
  • C 9/4°C
  • D 9/2°C
View Answer & Explanation