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Q.

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

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a

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

b

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

c

a vernier scale of least count 0.01 mm

d

a screw gauge of least count 0.001 mm

answer is D.

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