WAEC Physics 2024 Objective — Question 1
Question 1 of 50 from the West African Examinations Council (WAEC) Physics 2024 Objective paper, with the correct answer and a full explanation.
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1. The vacuum and silvered surfaces of a vacuum flask walls are to respectively A.
- A. minimize conduction and convection and prevent radiation.Correct
- B. prevent conduction and convection and minimize radiation.
- C. prevent conduction and minimize convection and radiation.
- D. minimize conduction and pre-vent conduction and radiation.
Explanation
The vacuum and silvered surfaces of a vacuum flask prevents heat transfer by conduction and convection while the silvered surfaces minimize heat transfer by radiation. This combination helps to maintain the temperature of the contents inside the flask for an extended period of time by reducing all three major modes of heat transfer.
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