7. In a vernier callipers, there are 10 divisions on the vernier scale and 1 cm on the main scale is divided in 10 parts. While measuring a length, the zero of the vernier lies just ahead of 1.8 cm mark and 4th division of vernier coincides with a main scale division. (a) Find the length. (b) If zero error of vernier callipers is - 0.02 cm, what is the correct length ? Ans. (a) 1:84 cm, (b) 1.86 cm •
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1
Correct option is
A
2
Length of one main scale division is 1 mm.
Number of division on vernier scale =10
Main scale reading =1.8 cm
Division of vernier coinciding =4
th
L.C=
10
1
mm=0.1 mm=0.1 cm
Length of rod = main scale reading + vernier division coinciding × L.C
=1.8+4 X 0.01
=1.84 cm
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