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  4. The number of circular divisions on the shown screw gauge is 50. It moves 0.5 mm on main scale for one complete rotation. Main scale reading is 2. The diameter of the ball is

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Q. The number of circular divisions on the shown screw gauge is $50$. It moves $0.5\, mm$ on main scale for one complete rotation. Main scale reading is $2$. The diameter of the ball isPhysics Question Image

Physical World, Units and Measurements

Solution:

Zero error $=5\times\frac{0.5}{50}=0.05\,mm$
Actual measurement
$=2\times0.5\,mm+25\times\frac{0.5}{50}-0.05\,mm$
$=1\,mm+0.25\,mm-0.05\,mm=1.20\,mm$