Which of the following is the most precise device for measu…

Physics Units, Dimensions and Measurement Errors of Measurement MCQ (Single Correct)

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

A vernier callipers with 20 divisions on the vernier scale coinciding with 19 main scale divisions

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

A spherometer of pitch 0.1 mm and 100 division on the circular scalem

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

Text Solution

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The correct answer is:

The most precise device is one whose least count is the least.

Least count of vernier calipers

( )

Least count of screw gauge

Least count of spherometer

Wavelength of light , cm= Clearly the optical instrument is the most precise.

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