Question

The property to restore the natural shape or to oppose the deformation is called
(A) Elasticity
(B) Plasticity
(C) Ductility
(D) None of the above

Answer 1

Hint : Elastic limit is defined as the maximum stress or force that can be applied to a material and not deforming the shape of the material. When the force is removed from the material, it comes back to its original shape and size. For example when force is applied to a spring its shape changes if the force applied is less than elastic limit. If force applied to the spring is greater than the elastic limit, then the shape of spring will change permanently.

Complete Step by Step Solution:
Step I:
When force is applied on the objects, then the objects change their shape. But there are some objects or materials that have the ability to come back to their original shape as soon as the force applied is removed. Such materials are known as elastic materials and this property is known as elasticity. This means that they undergo reversible transformation.
Step II:
Some objects do not have the capability to come back to their original shape after force is removed. Such materials are called plastic materials and this property is known as plasticity. This means that they undergo irreversible change in their shape. This shows that plastic materials do not have elastic properties.
Step III:
Some materials have the ability that they can be stretched beyond the elastic limit. These materials are called ductile materials and this property is known as ductility.
Step IV:

Therefore, option A is the right answer.

Note:
It is to be noted that elasticity is not a force. It is said to be a response to the applied force. The direction of force will always be in a direction so that the material comes back to its original shape. The elastic limit depends on the type of the material or the solid taken.