Experimental Physics

JEE Main level, single correct, medium

17 of 70

Question 17 of 70

A vernier callipers has 20 divisions on the vernier scale, which coincides with 19th 19^{\text {th }} division on the main scale. The least count of the instrument is 0.1 mm0.1 \mathrm{~mm}. One main scale division is equal to _____mm\mathrm{mm}.

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Answer: (B) 22

20VSD=19MSD1VSD=1920MSD L.C. =1MSD−1VSD0.1 mm=1MSD−1920MSD0.1=120MSD1MSD=2 mm\begin{aligned} & 20 \mathrm{VSD}=19 \mathrm{MSD} \\ & 1 \mathrm{VSD}=\frac{19}{20} \mathrm{MSD} \\ & \text { L.C. }=1 \mathrm{MSD}-1 \mathrm{VSD} \\ & 0.1 \mathrm{~mm}=1 \mathrm{MSD}-\frac{19}{20} \mathrm{MSD} \\ & 0.1=\frac{1}{20} \mathrm{MSD} \\ & 1 \mathrm{MSD}=2 \mathrm{~mm}\end{aligned}

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