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9.1 , fluid mechanics — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics9.1 , fluid mechanics1 Mark
MCQ
The diagram shows a simple mercury barometer.Which of the following does not cause the height of the mercury column to vary ?
  • A
    Changes in the atmospheric pressure
  • B
    Changes in the value of $g$
  • ✓
    Evaporation of mercury from the barometer reservoir
  • D
    Leakage of air into the tube
✓

Answer

Correct option: C.
Evaporation of mercury from the barometer reservoir
c
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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