a) bulk modulus
b) viscosity
c) specific density
d) young’s modulus

Answer: b
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.