a)The maximum stress below which Hooke’s law is applicable is called elastic limit
b)When a wire is stretched more ,then it has permanent strain even when the stress is zero. Then wire is said to have permanent set .
c) When a wire is stretched too much ,then it has permanent strain even when the stress is zero. This behavior of the material is called plastic deformation.
d)The stretched wire breaks for certain applied stress is fracture point.
