2022 Phase 2 Units and MeasurementsDimensional formulae Easy Question 20 of 53 in Units and Measurements

The physical quantity that has the same dimensional formula as pressure is:

A Coefficient of viscosity
B Force
C Momentum
D Young's modulus of elasticity

The answer is D.

Solution

$[P]=\frac{[F]}{[A]}=\frac{MLT^{-2}}{L^2}=ML^{-1}T^{-2}$. Young's modulus $Y=\frac{stress}{strain}=\frac{F/A}{\Delta L/L}$ has the same dimensions $ML^{-1}T^{-2}$.

Concept Dimensional formulae

Units and Measurements in past papers

53 questions from this chapter have appeared across 25 exam years.