Solved: PHYSICS Question for NEET

NEET PHYSICSEasy

The stress-strain curves are drawn for two different materials $X$ and $Y$ . It is observed that the ultimate strength point and the fracture point are close to each other for material $X$ but are far apart for material $Y$ . We can say that the materials $X$ and $Y$ are likely to be (respectively):

ductile and brittle

brittle and ductile

brittle and plastic

plastic and ductile

Step-by-Step Solution

Analysis of Stress-Strain Curve: On a stress-strain curve, the ultimate tensile strength point represents the maximum stress a material can withstand, while the fracture point is where the material breaks.
Brittle Material: If the fracture point (E) is close to the ultimate strength point (D), the material fractures soon after reaching its maximum strength without significant plastic deformation. Such a material is called brittle (e.g., glass, cast iron) .
Ductile Material: If the fracture point (E) is far apart from the ultimate strength point (D), the material undergoes extensive plastic deformation before fracturing. Such a material is called ductile (e.g., copper, aluminum) .
Conclusion: Since for material $X$ the points are close, it is brittle. For material $Y$ , the points are far apart, so it is ductile.

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