Question

The stress-strain graph for a metallic wire is shown at two different temperatures, $T_{1}$ and $T_{2}$ which temperature is high $T_{1}$ or $T_{2} ?$

• A. $T_{1} > T_{2}$
• B. $T_{2} > T_{1}$
• C. $T_{1}=T_{2}$
• D. None of these

Answer 1

Answer: (A)

The slope of stress-strain curve with strain axis gives the value In the above graph strain is taken along y-axis. Therefore the slope of graph at temperature $T_{1}$ is less than the slope of graph at temperature $T_{2}$. Now as we know with increase in temperature the value of modulus of elasticity decreases. Therefore temperature $T_{1}$ is greater than temperature $T_{2}$.