Post-UTME Physics 2015 Objective — Question 12

Question 12 of 20 from the Post-UTME Screening (Post-UTME) Physics 2015 Objective paper, with the correct answer and a full explanation.

Convectional current is a consequence of the fact that

A. no material medium is necessary for the process
B. at thermal equilibrium, temperature is constant
C. the current is due to charge movement
D. density is temperature-dependent.Correct

Explanation

Convection currents arise because a fluid's density changes with temperature, causing warmer (less dense) fluid to rise and cooler (denser) fluid to sink.

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