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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 26:
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 27:
A metal of mass 0.5kg is heated to 100°C and then transferred to a well-lagged calorimeter of heat capacity 80JK-1 containing water of heat capacity 420JK-1 at 15°C. If the final steady temperature of the mixture is 25°C, find the specific heat capacity of the metal.
  • A 877Jkg<sup style='font-size: smaller;'>-1</sup>K<sup style='font-size: smaller;'>-1</sup>
  • B 286Jkg<sup style='font-size: smaller;'>-1</sup>K<sup style='font-size: smaller;'>-1</sup>
  • C 133Jkg<sup style='font-size: smaller;'>-1</sup>K<sup style='font-size: smaller;'>-1</sup>
  • D 92Jkg<sup style='font-size: smaller;'>-1</sup>K<sup style='font-size: smaller;'>-1</sup>
View Answer & Explanation
Question 28:
The time rate of loss of heat by a body is proportional to the
  • A Difference in temprature between the body and its surroundings
  • B Temperature of its surroundings
  • C Ratio of the temperature of the body to that of its surroundings
  • D Temperature of the body
View Answer & Explanation
Question 29:
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>
View Answer & Explanation
Question 30:
A 50W electric heater is used to heat a metal block of mass 5kg. If in 10 minutes a temperature rise of 12oC is achieved, the specific heat capacity of the metal is
  • A 400 J kg<sup style='font-size: smaller;'>-1</sup>K<sup style='font-size: smaller;'>-1</sup>
  • B 500 J kg<sup style='font-size: smaller;'>-1</sup>K<sup style='font-size: smaller;'>-1</sup>
  • C 390 J kg<sup style='font-size: smaller;'>-1</sup>K<sup style='font-size: smaller;'>-1</sup>
  • D 130 J kg<sup style='font-size: smaller;'>-1</sup>K<sup style='font-size: smaller;'>-1</sup>
View Answer & Explanation