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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

Fill in the blanks: 
d) The relative density of lead is 11.3. Its density is ....g cm–3or ....kg m–3.


11.3

, 11.3 x 103

Tips: -

Relative space density space equals space fraction numerator Density space of space straight a space substance space over denominator Density space of space water end fraction

Density space of space water space equals space 1 space gm divided by cm cubed space

Density space of space lead space equals space Relative space density space of space lead space cross times space density space of space water

space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 11.3 cross times 1 space equals space 11.3 space straight g divided by cm cubed space

1 space straight g space equals space 1 over 1000 space kg

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

1 space straight g divided by cm cubed space equals space 10 to the power of negative 3 end exponent over 10 to the power of negative 6 end exponent space kg divided by straight m cubed space equals space 10 cubed space kg divided by straight m cubed space

therefore space 11.3 space straight g divided by cm cubed space equals space 11.3 space cross times space 10 cubed space kg divided by straight m cubed
177 Views

Define unit.

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

Example: Unit of time is second. 

1172 Views

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. 
1289 Views

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.


878 Views

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. 
825 Views

Give four examples of physical quantities.

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