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A vernier calipers has 1mm marks on the ...

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

A

`0.02 mm`

B

`0.05mm`

C

`0.1mm`

D

`0.2mm`

Text Solution

Verified by Experts

The correct Answer is:
D
Main scale division MSD = 1mm
1 vernier scale division VSD `=(16)/(20)=0.8mm`
Least count is equal to difference between one main scale division and vernier scale division. Hence least count can be written as follows :
`LC= 1MSD - 1VSD= 1-0.8 =0.2 mm`
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Knowledge Check

  • One division on the main scale of a vernier callipers is equal to 1 mm. its vernier scale has 20 equal divisions which match with 16 main scale division. The least countof the vernier calipers is

    A
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    C
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    D
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    `0.05 cm " if "1 MSD = 0.05cm`
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    D
    `0.005 cm " if "1 MSD = 0.05cm`

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