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Using a screw gauge of pitch 0.1 cm and 50 divisions on its circular scale, the thickness of an object is measured. It should correctly be recorded as

Asked in JEE Main 3rd Sept 1st Shift 2020 · Pitch and least count

• (1) 2.121 cm
• (2) 2.124 cm
• (3) 2.125 cm
• (4) 2.123 cm

Step-by-step solution

Why the other options are wrong

• (1) 2.121 is not a whole number of least counts (0.002 cm).
• (3) 2.125 is a multiple of 0.005, not of the least count 0.002 cm.
• (4) 2.123 is not a multiple of 0.002 cm.

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