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Screw gauge is said to have a negative e...

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.

Text Solution

Verified by Experts

The correct Answer is:
B
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Knowledge Check

  • The zero error in a Vernier callipers is said to be negative when

    A
    zero of Vernier scale is towards the right of the zero of main scale
    B
    zero of Vernier scale coincides with the zero of main scale
    C
    zero of Vernier scale is towards left of the zero of main scale
    D
    the vernier scale is not visible clearly.

  • A vernier calipers and a screw gauge have the same least count and zero error with the difference that the vernier calipers has positive zero error and the screw gauge has negative zero error. The number of circular scale divisions on the screw gauge is twice the number of vernier scale divisions on the vernier calipers and the pitch of the screw gauge is 1mm. If the vernier coinciding division and the circular are 3 and 97, respectively then find the number of vernier scale divisions on the vernier calipers.

    A
    10
    B
    200
    C
    50
    D
    100

  • The pitch of a screw gauge is 1mm and its cap is divided into 100 divisions. When this screw gauge is used to measure the diameter of a wire, then main scale reading is 2 mm and 58^(th) division of circular scale coincides with the main scale. There is no zero error in the screw gage. Then the diameter of the wire is

    A
    `2.38 mm`
    B
    `2.48 mm`
    C
    `2.58 mm`
    D
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