Diagrams show readings of a micrometer screw gauge. Figure (i) shows the zero error reading when the screw gauge is closed, figure (ii) the the reading when the screw gauge is being used to measure the diameter of a ball-bearing. What is the diameter of the ball-bearing ? There are 50 divisions on circular scale.

Question

Diagrams show readings of a micrometer screw gauge. Figure (i) shows the zero error reading when the screw gauge is closed, figure (ii) the the reading when the screw gauge is being used to measure the diameter of a ball-bearing. What is the diameter of the ball-bearing ? There are 50 divisions on circular scale. (A) 5.29 mm (B) 5.26 mm (C) 5.32 m (D) 5.28 mm

Tardigrade Admin · Accepted Answer

Zero error is 3 division LC =(0.5/50)=0.01 mm zero error =0.03 mm Reading =5.0+29 × 0.01 d =5.29-0.03=5.26 mm

$5.29 mm$

$5.26 mm$

$5.32 m$

$5.28 mm$

Zero error is $3$ division
$L C = \frac{0.5}{50} = 0.01 mm$
zero error $= 0.03 mm$
Reading $= 5.0 + 29 \times 0.01$
$d = 5.29 - 0.03 = 5.26 mm$

5.29mm

5.26mm

5.32m

5.28mm

Zero error is 3 division LC=500.5​=0.01mm zero error =0.03mm Reading =5.0+29×0.01 d=5.29−0.03=5.26mm

$5.29 mm$

$5.26 mm$

$5.32 m$

$5.28 mm$

Zero error is $3$ division
$L C = \frac{0.5}{50} = 0.01 mm$
zero error $= 0.03 mm$
Reading $= 5.0 + 29 \times 0.01$
$d = 5.29 - 0.03 = 5.26 mm$