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Why do we have different units for same physical quantity?

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The value of any given physical quantity may vary over a wide range, therefore, different units of same physical quantity are required.
e.g.,The length of a pen can be easily measured in cm, the height of a tree can be measured in metres, the distance between two cities can be measured in kilometres and distance between two heavenly bodies can be measured in light year.
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Knowledge Check

  • United physical quantity

    A
    can have non-zero dimensions
    B
    cannot have non-zero dimensions
    C
    must have zero dimensions
    D
    does not exist

  • Torr is the unit of physical quantity

    A
    density
    B
    pressure
    C
    torque
    D
    None

  • Kelvin is the unit of which physical quantity?

    A
    Current
    B
    Temperature
    C
    Heat
    D
    None of these

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