Question

Pick the odd one out. Give scientific reason for your answer.

• A. $kgc{m}^{-3}$
• B. $gc{m}^{-3}$
• C. $kgm{m}^{-3}$
• D. $kgc{m}^{-2}$

Answer 1

The correct option is D

$kgc{m}^{-2}$

1. The physical quantity which is described by the units $kgc{m}^{-3}$, $gc{m}^{-3}$, and $kgm{m}^{-3}$ is the mass per unit volume.
2. Mass per unit volume is known as density.
3. Thus, $kgc{m}^{-3}$, $gc{m}^{-3}$, and $kgm{m}^{-3}$describe density.
4. The physical quantity which is described by the unit $kgc{m}^{-2}$ is mass per unit area.
5. Thus, the odd one out is $kgc{m}^{-2}$.

Hence, option D is the correct answer.