Under the elastic limit,the stress is:

When a heavy weight is suspended from a metal wire and then removed,the wire does not regain its original length. Why?

$A$ cube of aluminium of sides $0.1 \, m$ is subjected to a shearing force of $100 \, N$. The top face of the cube is displaced through $0.02 \, cm$ with respect to the bottom face. The shearing strain would be

The load versus elongation graph for four wires of same length and the same material is shown in the figure. The thinnest wire is represented by the line:

What is stress? Give its two definitions.

Which one of the following is the weakest kind of bonding in solids?