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A screw gauge has a least count of 0.01 mm and there are 50 divisions in its circular scale. The pitch of the screw gauge is:

Asked in NEET 2020 · Pitch and least count

• (1) 0.25 mm
• (2) 0.5 mm
• (3) 1.0 mm
• (4) 0.01 mm

Step-by-step solution

Why the other options are wrong

• (1) comes from halving the pitch once more, as though the screw advanced half a division per turn
• (3) comes from assuming the usual 1 mm pitch of a laboratory screw gauge, which would need 100 circular divisions to give this least count, not 50
• (4) comes from the least count itself, repeated as the pitch; the pitch is 50 times larger

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