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The circular divisions of shown screw ga...

The circular divisions of shown screw gauge are 50. It moves 0.5 mm on main scale in one rotation. The diameter of the ball is

A

2.25 mm

B

2.20 mm

C

1.20 mm

D

1.25 mm

Text Solution

Verified by Experts

The correct Answer is:
C
Zero error `= 5xx(0.5)/(50) = 0.05mm`
L.C. ` =(0.5 mm)/50 = 0.01 mm`
Actual measurement `= 2xx0.5+ 25 xx 0.01 -0.05`
= 1.20mm.
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