Errors in measurementHard
Question
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
Options
A.2.25 mm
B.2.20 mm
C.1.20 mm
D.1.25 mm
Solution
Zero error = 5 ×
= 0.05 mmActual measurement
= 2 × 0.5 mm + 25 ×
- 0.05 mm= 1 mm + 0.25 mm - 0.05 mm = 1.20 mm
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