What is stress? Give its two definitions.

The value of tension in a long thin metal wire has been changed from $T_{1}$ to $T_{2}$. The lengths of the metal wire at two different values of tension $T_{1}$ and $T_{2}$ are $l_{1}$ and $l_{2}$ respectively. The actual length of the metal wire is:

$A$ 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

Is it possible to double the length of a metallic wire by applying force over it?

The substances having a very short plastic region are

Match the details of Column-$II$ with the given information in Column-$I$ appropriately.

Column-$I$	Column-$II$
$(a)$ Stress is proportional to strain.	$(i)$ Elastic limit
$(b)$ When the load on the wire is removed, the body regains its original dimension.	$(ii)$ Limit of proportionality
	$(iii)$ Plastic deformation