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The stress-strain graphs for two materia...

The stress-strain graphs for two materials A and B are shown in the figure. The graphs are drawn to the same scale.

(a) Which material has a greater Young's modulus ?
(b) Which material is more ductile ?
(c) Which material is more brittle?
(d) Which of the two is the stronger material ?

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(a) Material A has a greater Young's modulus because the slope of the linear portion of the stress-strain curve is greater for the material A.
(b) Material A is more ductile, because it has a greater plastic region (from elastic limit P to breaking point Q) than material B.
(c) Material B is more brittle , because it has a smaller plastic region.
(d) Material A is stronger , because it can withstand a greater stress before it breaks.
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