Quantity of Heat - Jamb Physics Past Questions and Answers

Question 41:

• JAMB 2021

Calculate the mass of ice that would melt when 2kg of copper is quickly transferred from boiling water to a block of ice without heat loss (specific heat capacity of copper = 400Jkg\(^{1}\)k\(^{-1}\), latent heat of fusion of ice = 3.3 x 10\(^{5}\)Jkg\(^{-1}\))

A. \(\frac{8}{33}\)kg
B. \(\frac{3.3}{80}\)kg
C. \(\frac{80}{33}\)kg
D. \(\frac{3.3}{8}\)kg

Question 42:

• JAMB 2021

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

Question 43:

• JAMB 2021

0.5kg of water at 10ºC is completely converted to ice at 0ºC by extracting (88000) of heat from it. If the specific heat capacity of water is 4200jkg\(^{1}\) Cº. Calculate the specific latent heat of fusion of ice.

A. 9.0kjkg\(^{-1}\)
B. 84.0kjkg\(^{-1}\)
C. 134.0kjkg\(^{-1}\)
D. 168.0kjkg\(^{-1}\)