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  4. Which of the following is a dimensionless quantity?

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Q. Which of the following is a dimensionless quantity?

AIIMSAIIMS 1995Physical World, Units and Measurements

Solution:

Strain $=\frac{\text { Extension in length }}{\text { Original length }}=\frac{[L]}{[ L ]}=\left[ L ^{0}\right] $
Therefore strain is a dimensionless quantity