Q.The shear modulus is also known as

Shear modulus and modulus of rigidity are simply two names for the same elastic modulus, denoted G (or eta).

Among the three types of elastic moduli covered in this chapter:

• Young's modulus (Y) relates longitudinal stress to longitudinal strain (stretching/compressing along one direction).
• Bulk modulus (K) relates volume (hydraulic) stress to volumetric strain (uniform compression, e.g. under fluid pressure). …