WAEC Physics 2020 Paper

Concept:Fundamental SI units are the seven base units; any other unit is derived from them.Explanation:The fundamental SI units are metre ($\mathrm{m}$), kilogram ($\mathrm{kg}$), second ($\mathrm{s}$), ampere ($\mathrm{A}$), kelvin ($\mathrm{K}$), mole ($\mathrm{mol}$), and candela ($\mathrm{cd}$).Metre, kilogram, and candela are all base units.Joule ($\mathrm{J}$) is a derived unit because it is expressed as $\mathrm{kg \cdot m^2 \cdot s^{-2}}$.Therefore, joule is not a fundamental unit.Answer:C. Joule