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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 31:
An immersion heater rated 2.0A, 240V is used to boil water from temperature 52°c to 100°c. If the mass of the water is 2.5kg. determine the time taken to boil the water.
[specific heat capacity of water = 4.2 x 103 jkg-1 k-1]
  • A 1.05 x 10<sup style='font-size: smaller;'>3</sup>s
  • B 1.05 x 10<sup style='font-size: smaller;'>5</sup>s
  • C 1.05 x 10<sup style='font-size: smaller;'>2</sup>s
  • D 1.05 x 10<sup style='font-size: smaller;'>4</sup>s
View Answer & Explanation
Question 32:
2 kg of water is heated with a heating coil which draws 3.5 A from a 200 V mains for 2 minutes. what is the increase in temperature of the water?
[specific heat capacity of water = 4200 jkg -1k-1]
  • A 30°
  • B 25°
  • C 15°
  • D 10°
View Answer & Explanation
Question 33:
A block of aluminum is heated electrically by a 25 W heater. if the temperature rises by 10°C in 5 minutes, the heat capacity of the aluminum is?
  • A 850 JK<sup style='font-size: smaller;'>-1</sup>
  • B 750 JK<sup style='font-size: smaller;'>-1</sup>
  • C 650 JK<sup style='font-size: smaller;'>-1</sup>
  • D 500 JK<sup style='font-size: smaller;'>-1</sup>
View Answer & Explanation
Question 34:
An electric heater rated 220v, 1000 w is immersed into a bucket full of water, calculate the mass of water if the temperature changes from 30°c to 100°c and the current flows for 300seconds.
[specific heat capacity of water = 4200 jkg-1 K-1]
  • A 4.28 kg
  • B 42.86 kg
  • C 1.02 kg
  • D 7.14 kg
View Answer & Explanation
Question 35:
I. High thermal capacity.
II. High sensitivity.
III.Easy readability.
IV. Accuracy over a wide range of temperature
From the statement above, the qualities of a good thermometer are
  • A I and II
  • B I, II,III and IV
  • C I, III and IV
  • D II, III and IV
View Answer & Explanation