Fill in the blanks: a) The volume of a cube of side 1 cm is equal to .....m3 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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Physics

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Fill in the blanks: 
a) The volume of a cube of side 1 cm is equal to .....m3


10-6 

1 cm = 1 space cm space equals space 1 over 100 space straight m
So comma space volume space of space the space cube space equals space 1 space cm cubed space

straight i. straight e. comma space 1 space cm cubed space equals space open parentheses 1 over 100 close parentheses cross times space open parentheses 1 over 100 close parentheses cross times space open parentheses 1 over 100 close parentheses space straight m space

therefore space 1 space cm cubed space equals space 10 to the power of negative 6 end exponent space straight m cubed

So space volume space of space straight a space cube space of space side space 1 space cm
is space equal space to space 10 to the power of negative 6 end exponent space cm cubed.

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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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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.

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


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Give four examples of physical quantities.

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