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Q.

Which of the following is the most precise device for measuring length ?

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a

a vernier callipers with 20 divisions on the sliding scale 

b

an optical instrument that can measure length to within a wavelength of light 

c

a screw gauge of pitch 1 mm and 100 divisions on the circular scale 

d

An ordinary scale with millimeter divisions.

answer is C.

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Detailed Solution

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For an instrument, lower the least count, higher is the precision. A more precise instrument can measure smaller distance.

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