ANS:A - shockloading

A material subjected to shockloading must have high resilience. Resilience is the ability of a material to absorb energy when it is deformed elastically and then return that energy upon unloading. When a material is subjected to sudden impact or shockloading, such as in the case of hammering, pounding, or sudden dynamic loads, it undergoes rapid deformation and needs to quickly recover its original shape without permanent damage. High resilience in a material allows it to absorb the energy of the impact and return to its original shape, effectively dampening the shock and preventing failure. Therefore, materials that are expected to withstand shockloading conditions, such as those used in machinery components or structural elements exposed to sudden impacts, must possess high resilience to maintain their integrity and functionality.