The diagram shows a simple mercury barometer. Which of the following does not cause the height of the mercury column to vary?

changes in the atmospheric pressure

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changes in the value of g

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evaporation of mercury from the barometer reservoir

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leakage of air into the tube

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Solution

The correct option is C evaporation of mercury from the barometer reservoir
Atmospheric pressure is directly proportion to the height of mercury.
pressure due Weight of mercury in column is equal to atmospheric pressure , if g will vary , height should adjust so as to keep W same.
Leakage of air inside the tube will disturb the vacuum, due to which pressure inside the tube will become equal to atmospheric pressure and height of mercury will become 0.
Evaporation of mercury does not cause the height to vary , because it doesn't not change the pressure at surface of reservoir .

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