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Crystal Lattice and Unit Cell

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Question

The circular scale of a screw guage has $50$ divisions and pitch of $0.5$ mm. Find the diameter of sphere. Main scale reading is $2$ .

A

1.2 m m

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B

1.25 m m

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C

2.20 m m

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D

2.25 m m

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Solution

The correct option is A $1.2 m m$
Diameter $= M S P + (L C) (V S R)$
$L C = \frac{0.5}{50} = 0.01 m m$
Diameter $= 1 + 0.01 \times (25 - 5) = 1.2 m m$

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