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${}^{-1}$