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Accuracy and Precision

19 divisions ...

Question

19 divisions on the main scale of a vernier callipers coincide with 20 divisions on the vernier scale. If each division on the main scale is of 1 cm, determine the least count of instrument.

A

0.01 cm

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B

0.02 cm

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C

0.05 cm

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D

0.1 cm

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Solution

The correct option is C 0.05 cm
Least count = $1 - \frac{m a i n s c a l e d i v i s i o n s}{c o i n c i d i n g d i v i s i o n s o n v e r n i e r s c a l e} \times 1 M S D$
$L C = 1 / 20 = 0.05$ cm

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