Question

What is the unit of shear stress?

(a) N/m^3

(b) N/mm^3

(c) N/m

(d) Pascal

This question was posed to me at a job interview.

I'd like to ask this question from Shear Stress and Pressure Gradient in chapter Viscous Flow & Turbulent Flow of Fluid Mechanics

Answer 1

Right answer is (d) Pascal

To explain I would say: Shear stress is defined as the force acting per unit area. Thus, the unit of shear stress is equal to N/m^2. Since, 1 Pa =1 N/m^2, Pascal is the most suitable one.