The graph is drawn between the applied force $F$ and the strain $(x)$ for a thin uniform wire. The wire behaves as a liquid in the part:

Assertion $(A)$: Ductile metals are used to prepare thin wires.
Reason $(R)$: In the stress-strain curve of ductile metals,the length between the points representing elastic limit and breaking point is very small.

Which one of the following is the Young's modulus (in $N/m^2$) for the wire having the stress-strain curve shown in the figure?

The potential energy $U$ between two molecules as a function of the distance $X$ between them is shown in the figure. The two molecules are

The graph below represents a typical stress-strain curve for a metal. Identify the point on the graph that is the ultimate tensile strength of the material.

Two different types of rubber are found to have the stress-strain curves as shown. Then: