JEE Main 2022 · 29 Jul · Shift 1 · Physics Q49

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PhysicsSingle correct+4 / -1Question 49 of 90

A travelling microscope has 20 divisions per cm on the main scale while its vernier scale has total 50 divisions and 25 vernier scale divisions are equal to 24 main scale divisions, what is the least count of the travelling microscope ?

0.001 cm

0.002 mm

0.002 cm

0.005 cm

Answer and worked solution

Official answer: C

Main scale division $\frac1{20}$ cm = 0.05 cm. One vernier division is $\frac{24}{25}$ MSD.

Least count $\frac1{25}\times0.05=0.002$ cm.

(C)

Topics:Vernier callipers and screw gauge Least count

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JEE Main 2022 · 29 Jul · Shift 1, Physics question 49