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Solution


Q.

A screw gauge gives the following readings when used to measure the diameter of a wire

Main scale reading : 0 mm

Circular scale reading : 52 divisions

Given that 1 mm on main scale corresponds to 100 divisions on the circular scale. The diameter of the wire from the above data is    (2021)
1 0.52 cm  
2 0.026 cm  
3 0.26 cm  
4 0.052 cm  

Ans.

(4) 

Given the pitch of the screw gauge, P = 1 mm

Number of circular division, n = 100

Thus least count LC=pn=1100=0.01mm=0.001cm

So, diameter of the wire =MSR+(CSR×LC)

=0 + (52 x 0.001 cm) = 0.052 cm