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Question

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

Main scale reading :0mm

Circular scale reading :52divisions

Given that, 1mmon main scale corresponds to100divisionsof the circular scale.

The diameter of wire from the above data is


A

0.052cm

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B

0.026cm

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C

0.005cm

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D

0.52cm

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Solution

The correct option is A

0.052cm


Step 1. Given data :

Main scale reading =0mm

Head scale reading =52divisions

Pitch=1mm

Total number of division on head scale =100

Step 2. Find the diameter of wire :

LC=pitch/totalno.ofdivisions=1/100=0.01mm

Diameter=MSR+(HSR×LC)=0+(52×0.01)=0.052mm

Hence ,(A) option is correct.


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