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1. units,dimensions and measurement — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics1. units,dimensions and measurement1 Mark
MCQ
A Vernier calipers has $1 \mathrm{~mm}$ 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
    $0.02 \mathrm{~mm}$
  • B
    $0.05 \mathrm{~mm}$
  • C
    $0.1 \mathrm{~mm}$
  • ✓
    $0.2 \mathrm{~mm}$
✓

Answer

Correct option: D.
$0.2 \mathrm{~mm}$
d
$\text { 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 \mathrm{~mm})=0.2 \mathrm{~mm}$

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