Question

The stress-strain graphs for materials $A$ and $B$ are shown in Figs. (i) and (ii) (given, $\theta <\alpha$ ).

The graphs are drawn to the same scale. Which of the two is the stronger material?

• A. $A$
• B. $B$
• C. Both $A$ and $B$
• D. None of these

Answer 1

Answer: (B)

From the given figure, we can say that, the slope of the linear portion of the stress-strain curve is greater for material $B$.
Hence, Young's modulus of $B$ is greater than that of material $A$. Material $B$ can withstand more load without breaking.
So, it is stronger than material $A$ and its ulimate stress is higher.