Question

when stress causes a material to change its shape is called
a plasticity
b deformation
c fracture
d elasticity

Explanation:

• Option a: Plasticity is the ability of a material to undergo permanent deformation, not the process of changing shape due to stress.
• Option b: Deformation is defined as the change in shape (or size) of a material due to applied stress, which matches the description in the question.
• Option c: Fracture is the breaking or cracking of a material, not just a change in shape.
• Option d: Elasticity is the ability of a material to return to its original shape after stress is removed, not the act of changing shape.

Answer:

b. Deformation