Diploma CET Mechanical Question Paper

86) The property of a material to restore its initial shape and dimensions after the load is removed is known as

Answer is:

Elasticity

Explanation:

Elasticity:
Whenever an external force is applied on a metal, it deforms. Elasticity is the property by virtue of which a metal regains its original shape when the external force applied on it is removed.
es: forming, forging, hammering

Plasticity: Plasticity is the property by which a metal retains its deformation permanently, when the external force applied on it is removed.
Examples: forming, forging, hammering

Strength: When external forces are applied on a metal, breaking (brittle metal) or yielding (ductile metal) may occur. Strength is the property of a metal by which it resists external force without breaking or yielding.

Hardness: Hardness is the ability of a metal to resist permanent change of shape caused by an external force.