JAMB Physics 2008 Objective — Question 25

Question 25 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2008 Objective paper, with the correct answer and a full explanation.

25. In a good thermos flask, the main cause of heat loss is

A. conduction through the corkCorrect
B. the plastic base of the thermos flask
C. the silvered walls and shiny metals
D. the outer cover or jacket

Explanation

The vacuum prevents conduction/convection loss, and silvered walls reduce radiation loss; the main remaining route for heat loss is conduction through the cork/stopper.

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