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Draw a neat sketch of a screw gauge . D...

Draw a neat sketch of a screw gauge . Discuss the positive and negative zero errors in a screw gauge and their corrections.

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Knowledge Check

  • Screw gauge is said to have a negative error.

    A
    when circular scale zero coincides with base line of main scale,
    B
    when circular scale zero is above the base line of main scale.
    C
    when circular scale zero is below the base line of main scale.
    D
    None of the above.

  • The least count of a screw gauge is defined as

    A
    `"distance moved by thimble on main scale"/"number of rotation of thimble"`
    B
    `"pitch of the screw"/"number of divisions on circular scale"`
    C
    `"number of rotation of thimble"/"number of circular scale divisions"`
    D
    None of the above

  • Screw gauge works on the principle of

    A
    micrometer screw
    B
    vernier
    C
    screw gauge
    D
    None of these

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