Question

What is the modulus of rigidity?

Options

• The ratio of tensile stress to tensile strain

• The ratio of shear stress to shear strain within elastic limits

• The ratio of normal stress to volumetric strain

• The ratio of pressure to volume change

Answer 1

The ratio of shear stress to shear strain within elastic limits

Explanation:

 The modulus of rigidity (shear modulus) is specifically defined as the ratio of shear stress to shear strain. It measures resistance to shape change when force is applied parallel to the surface.