Question

Viscosity is based on _________

(a) law of conservation of mass only

(b) law of conservation of energy only

(c) Newton’s law

(d) third law of thermodynamics only

This question was posed to me at a job interview.

The doubt is from Fluid Flow Theory in chapter Fluid Flow Theory & Applications of Food Processing Unit Operations

Answer 1

Right choice is (c) Newton’s law

The explanation: Viscosity is based on  Newton’s law of viscosity, which states that the shear stress between adjacent fluid layers is proportional to the velocity gradients between the two layers.