The figure shows the stress-strain curve for a given material. The approximate yield strength for this material is:
         

$\mathrm{1.\; 3}\times {10}^8 \mathrm{N} {\mathrm{m}}^{-2}$
2. 2×10⁸ N m^-2
3. 4×10⁸ N m^-2
4. 1.0×10⁸ N m^-2

The stress-strain graphs for materials A and B are shown in the figure. Young’s modulus of material A is (the graphs are drawn to the same scale):

1. equal to material B
2. less than material B
3. greater than material B
4. can't say

The stress-strain graphs for materials A and B are shown in the figure. Strength of material A is (the graphs are drawn to the same scale):

$$\begin{gathered} \left(1\right) \mathrm{greater} \mathrm{than} \mathrm{material} \mathrm{B} \\ \left(2\right) \mathrm{equal} \mathrm{to} \mathrm{material} \mathrm{B} \\ \left(3\right) \mathrm{less} \mathrm{than} \mathrm{material} \mathrm{B} \\ \left(4\right) \mathrm{insufficient} \mathrm{data} \end{gathered}$$