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Units and Measurement

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Physics Part I

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Physics

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
Answer the following : 
(a)You are given a thread and a metre scale. How will you estimate the diameter of
the thread ?


The diameter of the thread is so small that it cannot be measured using a metre scale. 

Wind a number of turns of threads on the metre scale so that the turns are closely touching one another.

Measure the length (l) of the windings on the scale which contains n number of turns.

Error converting from MathML to accessible text.

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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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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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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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Define unit.

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

Example: Unit of time is second. 

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Give four examples of physical quantities.

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