The most important requirement for aluminium industry is the availability of cheap

ANS:B - electrical power

The term "elastic properties" refers to the mechanical characteristics of a material related to its ability to deform under stress and return to its original shape when the stress is removed. These properties include:

1. Young's Modulus (Modulus of Elasticity): This represents the stiffness of the material and describes how much a material deforms in response to an applied force. It quantifies the ratio of stress to strain in the elastic region of deformation.
2. Poisson's Ratio: This parameter describes the lateral contraction or expansion of a material when it is stretched or compressed in one direction. It is the ratio of the transverse strain to the axial strain.
3. Shear Modulus (Modulus of Rigidity): This measures the material's resistance to shearing forces. It describes the ratio of shear stress to shear strain.
4. Bulk Modulus: This characterizes a material's response to uniform pressure. It describes the ratio of the change in pressure to the fractional volume change.

These properties collectively govern how a material responds to various types of mechanical loads, including tension, compression, and bending. They are crucial for designing components and structures to ensure they perform as intended under different loading conditions.