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A narrow uniform glass tube 80 cm long a...

A narrow uniform glass tube 80 cm long and open at both ends is half immersed in mercurry. Then the top of the tube is closed and it is taken out of mercury. A column of mercury 22 cm long then remains in the tube. What is the atmospheric pressure?

Answer

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A tube 1.5 m long and closed at on end is half filled with mercry and is then inverted with its open ends just dipping into a mercury tough.Find the height of mercury in the tube if the reading of the barometer is 0.75 m.

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Knowledge Check

  • A glass tube 80 cm long and open ends is half immersed in mercury. Then the top of the tube is closed and it is taken out of the mercury. A column of murcury 20 cm long then remains in the tube. The atmospheric (in cm of Hg) is (assume temperature to be constant )

    A
    75
    B
    30
    C
    60
    D
    90

  • A horizontal uniform glass tube of 100cm length is sealed at both ends contains 10 cm mercury column in the middle , the temperature and pressure of air on either side of mercury column are repectively 31^(@)C and 76cm of mercury, if the air column at one end is kept at 0^(@)C and the other end at 273^(@)C then pressure if air which is 0^(@)C is (in cm of Hg )

    A
    `76`
    B
    `88.2`
    C
    `102.4`
    D
    `122`

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    In given figure, A uniform cylindrical tube closed at one end, contains a pallet of mercury 5cm long. When the tube is kept verticaly with the closed end downward, the length of the air column trapped is 30cm . Now the tube is inverted so that the closed end goes up find the new length of the air column trapped. atmospheric pressure =75cm of mercury. (Assume temperature remains constant in this process)

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