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Class 10 Class 12

If the dimensions of a physical quantity are given by Ma Lb Tc, the physical quantity will be

• pressure if a = 1, b = -1, c= 2

• velocity if a = 1, b = 1, c = -2

• acceleration if a = 1, b = 1, c =-2

• force if a = 0, b = -1, c =- 2

A.

pressure if a = 1, b = -1, c= 2

Dimensions of velocity = [ M0L1T-1]

Here, a = 0, b =1, c = -1

Dimension of acceleration = [ M0L1T-2]

Dimension of force = [ M1L1T-2]

Dimension of pressure = [M1L-1T-2

The physical quantity is pressure.

Dimensions of velocity = [ M0L1T-1]

Here, a = 0, b =1, c = -1

Dimension of acceleration = [ M0L1T-2]

Dimension of force = [ M1L1T-2]

Dimension of pressure = [M1L-1T-2

The physical quantity is pressure.

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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 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

Give four examples of physical quantities.

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