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Monday, 17 August 2026
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Physics Past Questions and Answers

Topic: Quantity of Heat

Jamb Physics Questions - Quantity of Heat

Question 21:
How long does it take a 750W heater to raise the temperature of 1kg of water from 20oC to 50oC [specific heat capacity of water = 4200Jkg-1K-1]
  • A 84s
  • B 112s
  • C 168s
  • D 280s
View Answer & Explanation
Question 22:
How much heat is absorbed when a block of copper of mass 0.05kg and specific heat capacity 390Jkg-1K-1 is heated from 20oC to 70oC?
  • A 39 . 98 x 10<sup style='font-size: smaller;'>-1</sup>J
  • B 9.75 x 10<sup style='font-size: smaller;'>2</sup>J
  • C 3.98 x 10<sup style='font-size: smaller;'>3</sup>J
  • D 9.75 x 10<sup style='font-size: smaller;'>3</sup>J
View Answer & Explanation
Question 23:
When 100g of liquids L1 at 78°C was mixed with Xg of liquid L2 at 50°C, the final temperature was 66°C. Given that the specific heat capacity of L2is half that of L1, find x
  • A 50g
  • B 100g
  • C 150g
  • D 200g
View Answer & Explanation
Question 24:
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
View Answer & Explanation
Question 25:
A quantity of ice at 10oC is heated until the temperature of the heating vessel is 90oC. Which of the following constants is NOT required to determine the quantity of heat supplied to the vessel?
  • A Specific heat capacity of ice
  • B Specific heat capacity of water
  • C Specific latent heat of fusion
  • D Specific latent heat of vaporization
View Answer & Explanation