A screw gauge gives the following reading when used to measure the diameter of a wire.
Main scale reading : $0 m m$
Circular scale reading : $52 d i v i s i o n s$
Given that, $1 m m$ on main scale corresponds to $100 d i v i s i o n s$ of the circular scale.
The diameter of wire from the above data is

$0.052 c m$

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$0.026 c m$

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$0.005 c m$

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$0.52 c m$

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Solution

The correct option is A
$0.052 c m$

Step 1. Given data :
Main scale reading = $0 m m$
Head scale reading = $52 d i v i s i o n s$
$P i t c h = 1 m m$
Total number of division on head scale = $100$
Step 2. Find the diameter of wire :
$L C = p i t c h / t o t a l n o . o f d i v i s i o n s = 1 / 100 = 0.01 m m$
$D i a m e t e r = M S R + (H S R \times L C) = 0 + (52 \times 0.01) = 0.052 m m$
Hence ,(A) option is correct.

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A screw gauge gives the following reading when used to measure the diameter of a wire.Main scale reading :0mmCircular scale reading :52divisionsGiven that, 1mmon main scale corresponds to100divisionsof the circular scale.The diameter of wire from the above data is