Question

The stress-strain diagram for two materials $A$ and $B$ is shown below:

The following statements are made based on this diagram
(I) Material $A$ is more brittle than material $B$
(II) The ultimate strength of mateial $B$ is more than that of $A$
With reference to the above statements , which of the following applies?

• A. Both the statements are false
• B. Both the statements are true
• C. I is true but II is false
• D. I is false but II is true

Answer 1

The correct option is C I is true but II is false

Strain in material $B$ is more, hence is more ductile than $A$ or in other words, Material $A$ is more brittle than $B$. Material $A$ can reach upto higher stress level hence ultimate strength of material $A$ is more than that of $B$.
Hence, statement (I) is true and (II) is false.