Q.

Screw gauge is said to have a negative error

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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

answer is B.

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when circular scale zero is above the base line of main scale

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Screw gauge is said to have a negative error