JAMB Physics 2014 Objective — Question 25

Question 25 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2014 Objective paper, with the correct answer and a full explanation.

Heat transfer by convection in a liquid is due to the

A. increased vibration of the molecules of the liquid about their mean position
B. variation of density of the liquid
C. expansion of the liquid as it is heatedCorrect
D. latent heat of vaporization of the liquid

Explanation

Heat transfer by convection in a liquid is due to the expansion (and consequent decrease in density) of the liquid as it is heated, causing it to rise and set up convection currents.

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