Question

A Vernier calipers has $1\, mm$ marks on the main scale. It has $20$ equal divisions on the Vernier scale which match with $16$ main scale divisions. For this Vernier calipers, the least count is

• A. 0.02 mm
• B. 0.05 mm
• C. 0.1 mm
• D. 0.2 mm

Answer 1

Answer: (D)

0.2 mm

Answer 2

L.C. $=1 \text { M.S.D }-1 \text { V.S.D }$ $=\left(1-\frac{16}{20}\right) \text { M.S.D }$ $=\left(1-\frac{4}{5}\right)(1 \,mm )=0.2\, mm$