Young’s Modulus or Modulus of Elasticity : Young’s Modulus is defined as ratio of Normal Stress to Longitudinal Strain. Young’s Modulus is usually denoted with letter E. Young’s Modulus is also called as Modulus of Elasticity.

Bulk Modulus : Bulk Modulus is defined as, when a body is subject to three mutually perpendicular stresses, of equal intensity, the ratio of direct stress to the corresponding volumetric strain is known as Bulk Modulus. Bulk Modulus is usually denoted with letter K.

Rigidity Modulus or Shear Modulus : Rigidity Modulus is defined as ratio of Shear stress to Shear Strain. Rigidity Modulus is usually denoted with letter C. Rigidity Modulus is also called as Shear Modulus.

Question and Answers

The ratio of linear stress to linear strain is called Answer : Modulus of Elasticity or Young’s Modulus

Young’s modulus may be defined as the ratio of Answer : Linear stress to linear strain

Modulus of rigidity may be defined as the ratio of Answer : Shear stress to shear strain