WAEC Physics 2018 Objective — Question 3
Question 3 of 50 from the West African Examinations Council (WAEC) Physics 2018 Objective paper, with the correct answer and a full explanation.
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The diagram above illustrates a simple barometer. Which distance measures the atmospheric pressure?
- A. PQ
- B. QRCorrect
- C. RS
- D. QS
Explanation
Atmospheric pressure is balanced by the height of the mercury column, i.e. the vertical distance between the top of the mercury in the tube and the mercury surface in the open reservoir (QR).
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