Q1: Shear stress is directly proportional to

ANS:B - the shear strain

Shear stress is directly proportional to the shear strain. Shear stress is the force per unit area that acts parallel to the surface of a material. It represents the force required to deform or move one layer of the material relative to another layer. Shear strain, on the other hand, is a measure of the deformation caused by the shear stress. According to Hooke's law, which describes the linear relationship between stress and strain in elastic materials, shear stress is directly proportional to shear strain. This means that as the applied shear stress increases, the resulting shear strain also increases in proportion. While shear stress and shear strain are related, viscosity is a property of fluids that represents their resistance to deformation under shear stress. The velocity of a fluid may influence the magnitude of shear stress, but it is not directly proportional to shear stress. Therefore, the correct statement is that shear stress is directly proportional to the shear strain.