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

The diagram shows the change $x$ in the length of a thin uniform wire caused by the application of stress $F$ at two different temperatures $T_1$ and $T_2$. The variations shown suggest 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

Auniform rod rotating in gravity free region with certain constant angular velocity. The variation of tensile stress with distance $x$ from axis of rotation is best represented by which of the following graphs.

A graph is shown between stress and strain for a metal. The part in which Hooke's law holds good is

The stress-strain graphs for materials $A$ and $B$ are shown in 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?