JAMB Physics 2018 Paper

Concept:Pressure is defined as force acting per unit area. Its dimension is found by dividing the dimension of force by the dimension of area.Explanation:Force $=$ mass $\times$ acceleration.Dimension of mass $= M$Dimension of acceleration $= LT^{-2}$So, dimension of force $= M \times LT^{-2} = MLT^{-2}$Area $=$ length $\times$ breadth $= L \times L = L^2$Therefore, dimension of pressure $= \frac{\text{Force}}{\text{Area}}$$= \frac{MLT^{-2}}{L^2}$$= ML^{-1}T^{-2}$Answer:The correct dimension of pressure is $ML^{-1}T^{-2}$, which matches option A.