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Assertion : Specific gravity of a fluid is a dimensionless quantity.
Reason : It is the ratio of density of fluid to the density of water.
Options:
Reason : It is the ratio of density of fluid to the density of water.
Solution:
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The correct answer is:
If both assertion and reason are true and reason is the correct explanation of assertion
Specific gravity is former name of relative density and relative density is the density of a substance divided by the density of water.
$\therefore \quad$ Specific gravity $=$ relative density
$$
=\frac{\text { density of substance }}{\text { density of water }}=\text { dimensionless. }
$$
$\therefore \quad$ Specific gravity $=$ relative density
$$
=\frac{\text { density of substance }}{\text { density of water }}=\text { dimensionless. }
$$
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