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Accuracy and Precision

Zero error wi...

Question

Zero error will be added in observed reading when

A

zero of the vernier scale is on the right hand side of main scale

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B

zero of the vernier scale is on the left hand side of main scale

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C

in both a and b

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D

none of the above

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Solution

The correct option is B zero of the vernier scale is on the left hand side of main scale
If the zero of the vernier scale is before zero of the main scale, we are measuring an extra measurement and hence the error has to be substracted, and if the zero of the main scale is after the vernier scale zero, then zero error has to be added. Thus option (b) is the correct option

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