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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 6:
A 2000W electric heater is used to heat a metal object of mass 5kg initially at 10oC. If a temperature rise of 30oC is obtained after 10min, the heat capacity of the material is
  • A 6.0 x 10<sup style='font-size: smaller;'>4</sup>J<sup style='font-size: smaller;'>o</sup>C<sup style='font-size: smaller;'>-1</sup>
  • B 4.0 x 10<sup style='font-size: smaller;'>4</sup>J<sup style='font-size: smaller;'>o</sup>C<sup style='font-size: smaller;'>-1</sup>
  • C 1.2 x 10<sup style='font-size: smaller;'>4</sup>J<sup style='font-size: smaller;'>o</sup>C<sup style='font-size: smaller;'>-1</sup>
  • D 8.0 x 10<sup style='font-size: smaller;'>4</sup>J<sup style='font-size: smaller;'>o</sup>C<sup style='font-size: smaller;'>-1</sup>
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Question 7:
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>
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Question 8:
A block of aluminum is heated electrically by a 30 w heater if the temperature rises by 10°c in 5 minutes, the heat capacity of the aluminum is
  • A 900 JK<sup style='font-size: smaller;'>-1</sup>
  • B 90 JK<sup style='font-size: smaller;'>-1</sup>
  • C 100 JK<sup style='font-size: smaller;'>-1</sup>
  • D 200 JK<sup style='font-size: smaller;'>-1</sup>
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Question 9:
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
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Question 10:
Lamps in domestic lightings are usually in
  • A Series
  • B Divergent
  • C Convergent
  • D Parallel
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