WAEC Physics 2017 Objective — Question 18

Question 18 of 50 from the West African Examinations Council (WAEC) Physics 2017 Objective paper, with the correct answer and a full explanation.

In a thermos flask, heat loss by radiation is minimized by the

A. A. silvered surfacesCorrect
B. B. vacuum within the double walls
C. C. plastic stopper
D. D. cork support

Explanation

In a thermos flask, the silvery walls prevent heat loss by radiation. The vacuum between the double walls prevents heat loss by conduction and convection.

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