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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

Previous Year Papers

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Class 10 Class 12

Fill in the blanks : 
c) A vehicle moving with a speed of 18 km h–1covers....m in 1 s




Tips: -

1 space km divided by hr space equals space fraction numerator 1 cross times 1000 over denominator 3600 end fraction space equals space 5 over 18 space straight m divided by straight s space
straight i. straight e. comma space 18 space km divided by hr space equals space 18 cross times 5 over 18 equals space 5 space straight m divided by straight s space

Now comma space

Distance space equals space speed space cross times space time space

space space space space space space space space space space space space space space space space space equals space 5 cross times 1 space equals space 5 space straight m
190 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

Give four examples of physical quantities.

Examples of Physical quantitie are force, mass, density and power.
821 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

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

Define unit.

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

Example: Unit of time is second. 

1172 Views

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