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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 51:
When two objects A and B are supplied with the same quantity of heat, the temperature change in A is obtained to be twice that of B. The mass of P is half that of Q. The ratio of the specific heat capacity of A to B is
  • A 1 : 4
  • B 4 : 1
  • C 1 : 1
  • D 2 : 1
View Answer & Explanation
Question 52:
Heat may be transferred by conduction, convention and radiation. By which of these methods does heat travel through vacuum?
  • A Conduction only
  • B Convection only
  • C Radiation only
  • D All these methods
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Question 53:
Heat is supplied uniformly at the rate of 100W to 1.0 x 10\(^{-2}\)kg of a liquid for 20 seconds. If the temperature of the liquid rises by 5\(^o\)C, then the specific heat capacity of the liquid is
  • A 2.0 x 10\(^2\)Jkg\(^-1\)K\(^-1\)
  • B 2.0 x 10\(^2\)Jkg\(^-1\)
  • C 4.0 x 10\(^4\)Jkg\(^-1\)K\(^-1\)
  • D 4.0 x 10\(^4\)Jkg\(^-1\)
View Answer & Explanation
Question 54:
A piece of substance of specific heat capacity 450Jkg\(^{-1}\)k\(^{1}\) 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 \(\frac{2}{9}\)ºC
  • B \(\frac{4}{9}\)ºC
  • C \(\frac{9}{2}\)ºC
  • D \(\frac{9}{4}\)ºC
View Answer & Explanation
Question 55:
Calculate the heat energy required to vaporize 50g of water initially at 80ºC if the specific heat capacity of water is 4.23jg\(^{-1}\)k\(^{-1}\) (specific latent heat of vaporization of water is 2260jg\(^{-1}\)
  • A 530000J
  • B 23200J
  • C 17200J
  • D 130000J
View Answer & Explanation