The figure shows the graph between stress and strain for a uniform wire at two different temperatures. Then:

The stress-strain graphs for materials $A$ and $B$ are shown in the figure. The graphs are drawn to the same scale.
$(a)$ Which of the materials has the greater Young's modulus?
$(b)$ Which of the two is the stronger material?

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.

In plotting stress versus strain curves for two materials $P$ and $Q$,a student by mistake puts strain on the $y$-axis and stress on the $x$-axis as shown in the figure. Then the correct statement$(s)$ is(are):
$(A)$ $P$ has more tensile strength than $Q$
$(B)$ $P$ is more ductile than $Q$
$(C)$ $P$ is more brittle than $Q$
$(D)$ The Young's modulus of $P$ is more than that of $Q$

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:

The diagram shows the stress versus strain curve for materials $A$ and $B$. From the curves,we infer that: