Q: The centimeter scale on a vernier calliper is divided into eight equal parts . Ten vernier divisions are contained in one cm . Calculate vernier constant .
(a) 0.1 cm
(b) 0.01 cm
(c) 0.025 cm
(d) 0.001 cm
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Ans: (c)
Sol: 1 S.D = 1/8 cm . Also , 10 V.D = 8 S.D
$\large 1 V.D = \frac{8}{10} S.D$
Vernier constant = 1 S.D – 1 V.D
$\large V.C = 1 S.D – \frac{8}{10} S.D $
$\large V.C = \frac{1}{5} S.D = \frac{1}{5} \times \frac{1}{8} cm = \frac{1}{40} cm $
V.C = 0.025 cm