Question

Statement 1: Blood is a _____

Statement 2: Thixotropic fluids are fluids whose viscosity decreases when subjected to shear stress initially but eventually with time, the viscosity increases.

(a) Newtonian fluid, False

(b) Rheopectic, True

(c) Pseudo plastic, False

(d) Casson plastic, True

This question was addressed to me in an interview.

The above asked question is from Unit Operations in division Food Processing Techniques, Fluid Mechanics and Rheology of Foods of Food Engineering

Answer 1

The correct option is (d) Casson plastic, True

To elaborate: Blood is a Casson plastic. At low shears, they’ve infinite viscosity. At high shears, its viscosity decreases with increase in shear. Statement 2 is true.