Question

The ratio between shear stress and shear rate in a fluid is called __________

(a) bulk modulus

(b) viscosity

(c) specific density

(d) young’s modulus

I got this question by my school principal while I was bunking the class.

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

Answer 1

The correct answer is (b) viscosity

Easy explanation: The ratio between shear stress and shear rate in a fluid is called viscosity. Bulk modulus can be defined as the relative change in volume of the object produced by tensile stress acting homogenously over its surface. Specific density is the ratio of density of the substance to density of a given reference material. Young’s modulus is defined as the ratio of tensile stress to tensile strain of a given material.