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the least count of the main scale of a ...

the least count of the main scale of a screw gauge is 1 mm. the minimum number of divisions on its circular scale required to measure 5`mu m` diameter of a wire is :

A

50

B

200

C

100

D

500

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Accuracy of screw gauge can be increased by …………. The number of divisions on circular scale.

The distance between two consecutive threads on the screw of a screw gauge is 0.5 mm. The number of divisions on the circular scale is 100. a wire is placed between of the studs of the screw gauge. Find the diameter of the wire if the pitch scale shows 14th division and 40th circular division coincides with the base line. The given apparatus was detected to have negative zero error. The 90th division on the circular scale of coincides with reference line, when the studs are in contact.

Knowledge Check

  • Pitch of a screw gauge is 0.5 mm and its least count is .01 mm, Calculate no. of divisons on its circular scale.

    A
    100
    B
    25
    C
    50
    D
    None of these

  • The distance moved by the screw of a screw gauge is 2 mm in four rotations and there are 50 divisions on its circular scale. Before starting the measurement, it is found that when the two jaws of the screw gauge are brought in contact 48th division of circular scale coincides with main scale line with zero of the main scale is barely visible. When a plate is placed between the jaws, main scale reads 1 mm and 6th division of the circular scale coincides with the main scale line. Thickness of the plate is

    A
    1.06 mm
    B
    1.04 mm
    C
    1.08 mm
    D
    1.12 mm

  • Two full turns of the circular scale of a screw gauge cover a distance of 1mm on its main scale. The total number of divisions on the circular scale is 50 . Further, it is found that the screw gauge has a zero error of - 0.03mm . While main scale reading of 3mm and the number of circular scale divisions in line with the main scale as 35 . the dimeter of the wire is

    A
    (a) `3.32mm`
    B
    (b) `3.73mm`
    C
    ( c ) `3.67mm`
    D
    (d) `3.38mm`

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