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Q.

In the reading shown in the figure, find the zero error, if each division of main scale is 1 mm

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a

-0.05cm

b

0.05cm

c

-0.03cm

d

0.03cm

answer is C.

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Detailed Solution

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IIIrd division Vernier scale excess coincide with main scale division. So error is 3×0.01 cm.
= 0.03 cm

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In the reading shown in the figure, find the zero error, if each division of main scale is 1 mm