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Question

A dimensionless quantity ______.


A

never has a unit

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B

always has a unit

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C

may have a unit

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D

does not exist

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Solution

The correct option is C

may have a unit


A dimensionless quantity need not always have a unit, example: angular displacement, θ is dimensionless but has a unit of radians, and quantities like co-efficient of friction, have no dimensions and no units.


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