Question

Which of the following is the CGS unit of relative density?

• A. $kg{m}^2{s}^{-2}$
• B. $kg{m}^{-3}$
• C. $gc{m}^{-3}$
• D. None of the above

Answer 1

The correct option is D None of the above

The relative density is a ratio of similar quantities, so it has no unit. It is the ratio of the density of a substance to that of water:

Relative density $=\frac{\text{density of a substance}}{\text{density of water}}$

So option D is correct.