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JAMB Physics 2006 Question 50

Question 50

Pressure

Atmospheric pressure = 76cm mercury
In the diagram above, the pressure of the gas is

Diagram for this question
  1. A.96cm of mercury.
  2. B.86 cm of mercury.
  3. C.66 cm of mercury.
  4. D.76 cm of mercury.
Show the answer and explanation

Answer: B (86 cm of mercury.)

Explanation

The mercury in the open limb stands 10 cm higher than on the gas side, so the gas pressure is atmospheric pressure plus 10 cm: 76 + 10 = 86 cm of mercury.