A dimensionless quantity --

a)Never has a unit

b)Always has a unit

c)May have a unit

d)does not exist

A dimensionless quantity has no dimensions but it may or may not have units. Two very common examples f dimensionless quantities are refractive index which does not have any units and angle which has units (degrees, radians).

So, the correct answer would be option(c).

  • 20

(a)Never has a unit

eg: angle, refracxtive index/specific gravity... dey r dimensionless quantities wch do not have any unit...

hope it helps

thankz

  • -13

 But answer is (c)

  • 0

 Yes now I got its answer.

Mole -- Mole is a unit but its dimension less

  • 1

ohk... thankz 4 dat...

  • -8
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