ï»¿ Fill in the blanks:Â d)Â The relative density of lead is 11.3. Its density is ....g cmâ€“3or ....kg mâ€“3. from Physics Units and Measurement Class 11 Manipur Board

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Fill in the blanks:Â
d)Â The relative density of lead is 11.3. Its density is ....g cmâ€“3or ....kg mâ€“3.

11.3

, 11.3 x 103

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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 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 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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