ï»¿ Which of the following is the most precise device for measuring length :Â (a) a vernier callipers with 20 divisions on the sliding scaleb) a screw gauge of pitch 1 mm and 100 divisions on the circular scale(c) an optical instrument that can measure length to within a wavelength of light. from Physics Units and Measurement Class 11 Manipur Board

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Which of the following is the most precise device for measuring length :Â
(a) a vernier callipers with 20 divisions on the sliding scale
b) a screw gauge of pitch 1 mm and 100 divisions on the circular scale

(c) an optical instrument that can measure length to within a wavelength of light.

A device with minimum count is the most suitable to measure length.

a)Â

Â Â

b)Â

Â

Hence, it can be inferred that an optical instrument is the most suitable device to measureÂ length.

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What is the need of measurement?

To get the complete knowledge of any physical quantity, measurement is needed. Measurement of any physical quantity involves comparison with a certain basic, arbitrarily chosen, internationally accepted reference standard called unit. Knowledge without measurement is incomplete and unsatisfactory.
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What is measurement?

Measurement is the process of attaching a numeric value to an aspect of a natural phenomenon. Measurement is making the quantitative knowledge of a physical quantity.
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Define physical quantity.

A measurable quantity in terms of which laws of Physics can be expressed is called physical quantity.

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Give four examples of physical quantities.

Examples of Physical quantitie are force, mass, density and power.
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Define unit.

The quantity used as a standard of measurement is called unit.

Example: Unit of time is second.

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