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When a Fortins barometer is used to meas...

When a Fortins barometer is used to measure the pressure on the surface of the earth and on the top of a building the main scale redaing is found to be the same and the vernier scale reading is found to be 9 and zero, respectively. If one M.S.D. is 1 mm and number of vernier scale divisions is 10, calculate the height of the building. Take the average density of air as `1.3 kg m^(-3)`, and that of mercury as `13.6 g cm^(-3)`

Text Solution

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When wind blows with high speed over the roof of a hut, the roofis blown away due to the pnssure difference created between top and bottom surfaces of the roof. Hence, R is not the correct explanation of A.
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Given that 1 M.S.D. of a vernier calliper is 1 mm and it's least count is 0.001 cm then the number of vernier scale divisions is 100.

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Knowledge Check

  • The main scale of vernier callipers is divided into 0.5mm and its least count is 0.005 cm . Then the number of divisions on vernier scale is

    A
    `10`
    B
    `20`
    C
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    D
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  • If S and V are one main scale and one Vernier scale and n - 1 divisions on the main scale are equivalent to n divisions of the Vernier , then

    A
    The least count is `S//n`.
    B
    The Vernier constant is `S//n`.
    C
    The same Vernier constant can be used for circular Vernier also.
    D
    The same vernier constant cannot be used for circular Verniers.

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