Which of the following is the most accurate instrument for measuring length?

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A screw gauge having pitch 1 mm and 50 divisions on the circular scale

Vernier calipers having 20 divisions on the sliding scale which coincide with 19 divisions on the main millimeter scale

A screw gauge of least count 0.001 mm

A vernier scale of least count 0.01 mm

answer is D.

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Detailed Solution

The instrument with least value of L.C is the most accurate.

$A) \frac{1}{20} mm = 0.05 mm$

$B) \frac{1}{50} mm = 0.02 mm$

$C) 0.01 mm$

$D) 0.001 mm$

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