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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.

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Give four examples of physical quantities.

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