Question

How can we write dynamic viscosity using the MLT system?

(a) [M][L][T]^-2

(b) [M][L]^2[T]^3

(c) [M][L]^-1[T]^-1

(d) [M][L][T]^3

I have been asked this question during a job interview.

My question comes from Dimensional Homogenity in portion Dimensional and Model Analysis of Fluid Mechanics

Answer 1

Right answer is (c) [M][L]^-1[T]^-1

Explanation: Dynamic viscosity can be written dimensionally by [M][L]-1[T]^-1. This is by adopting the basic SI or MKS units. Where, [M] is the mass, [L] is the length and [T] is the time. Thus, the correct option is [M][L]^-1[T]^-1.