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NTA Abhyas 2020

Exam: NTA Abhyas
Year: 2020
Subject: Physics
Chapter: Experimental Physics

NTA Abhyas 2020 · Physics · Experimental Physics

Smallest division on the main scale of given Vernier calipers is...

Smallest division on the main scale of given Vernier calipers is

0.5

mm. Vernier scale has

25

divisions and these coincide with

24

main scale divisions. The least count of Vernier callipers is

Options

A $0.001$ cm
B $0.002$ cm
C $0.01$ cm
D $0.02$ cm

Correct answer

B. $0.002$ cm

Step-by-step solution

25VSD = 24MSD

1VSD = \dfrac{24}{25}MSD

.......(i)

The least count of Vernier calipers is

LC = 1MSD - 1VSD

= 1MSD - \dfrac{24}{25}MSD = \dfrac{1}{25}MSD

(using (i))

As

1MSD = 0.5mm

(given)

∴ LC = \dfrac{1}{25} ( 0.5mm ) = 0.02mm = 0.002cm

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