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Question

The least count of vernier calipers is 0.1 cm, and if the zero mark of the vernier scale is to right of zero of the main scale and the vernier coincides is 7 when the jaws are in contact, then the zero error is _____ cm.

A
+6 X 0.01
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B
+7 X 0.01
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C
-7 X 0.01
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D
-6 X 0.01
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Solution

The correct option is B +7 X 0.01
Since the zero mark of the vernier scale is to the right of the zero of the main scale. So the zero error is positive.
Positive zero error =n×L.C.=7×0.01 cm

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