Stress-Strain Curve

A copper wire and a steel wire of the same cross-sectional area and length are joined end-to-end (at one end). Equal and opposite longitudinal forces are applied to the free ends giving a total elongation of $l$. Then the two wires will have

Figure shows the stress-strain graphs for materials $A$ and $B.$ From the graph it follows that

The diagram shows a force-extension graph for a rubber band. Consider the following statements:
I. It will be easier to compress this rubber than expand it.
II. Rubber does not return to its original length after it is stretched.
III. The rubber band will get heated if it is stretched and released.

Which of these can be deduced from the graph:

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

The diagram shows stress vs. strain curve for the material $A$ and $B$. From the curves we infer that

The strain-stress curves of three wires of different materials are shown in the figure. $P,Q$ and $R$ and the elastic limits of the wires. The figure shows that