Question

The unit of modulus of rigidity is the same as those of-

• A. Stress, force and modulus of elasticity
• B. Strain, force and pressure
• C. Stress, pressure and modulus of elasticity
• D. Stress, strain and pressure

Answer 1

Answer:

C. Stress, pressure and modulus of elasticity

The modulus of rigidity has the same unit as stress, pressure, and modulus of elasticity. Elastic modulus (E) is the ratio of stress and strain, while rigidity modulus (G) is the ratio of shear stress and shear strain. Stress is the force applied to a certain cross-sectional area, and pressure is the force applied perpendicular to the surface of an object per unit area. The unit for all of these is N/m² or Pascal.