A student measured the length of a rod and wrote it as 3.50 cm. Which instrument did he use to measure it? from Physics Units and Measurement Class 11 Manipur Board
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Units and Measurement

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Physics Part I

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Class 10 Class 12

A student measured the length of a rod and wrote it as 3.50 cm. Which instrument did he use to measure it?

  • A meter scale.

  • A vernier calliper where the 10 divisions in vernier scale match with 9 division in the main scale and main scale have 10 divisions in 1 cm.

  • A screw gauge having 100 divisions in the circular scale and pitch as 1 mm.

  • A screw gauge having 100 divisions in the circular scale and pitch as 1 mm.


B.

A vernier calliper where the 10 divisions in vernier scale match with 9 division in the main scale and main scale have 10 divisions in 1 cm.

If student measures 3.50 cm, it means that there is an uncertainty of order 0.01 cm
For vernier scale with 1 MSD = 1mm
and 9 MSD = 10 VSD
LC of vernier scale with 1 MSD - 1 VSD
1 over 10 open parentheses 1 minus 9 over 10 close parentheses
space equals space 1 over 100 cm

If student measures 3.50 cm, it means that there is an uncertainty of order 0.01 cm
For vernier scale with 1 MSD = 1mm
and 9 MSD = 10 VSD
LC of vernier scale with 1 MSD - 1 VSD
1 over 10 open parentheses 1 minus 9 over 10 close parentheses
space equals space 1 over 100 cm

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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 physical quantity.

 


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

The result of a measurement of a physical quantity is expressed by a number accompanied by a unit.


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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 unit.

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

Example: Unit of time is second. 

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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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