Exams › NEET › Physics

A metal wire upon excess stress moves to a region of permanent set. Before yielding to the fracture stress, it undergoes an extension equal to twice its length in its plastic region. The nature of the metal is

1. Brittle
2. Ductile
3. Perfectly elastic
4. Perfectly plastic

Correct answer: Ductile

Solution

A ductile metal undergoes substantial plastic deformation after yielding, so it can extend a lot before fracture. Brittle materials fracture with little plastic strain, while perfectly elastic or perfectly plastic are idealized behaviors that do not match this description.

Related NEET Physics questions

• Assertion (A): Ductile metals are used to prepare thin wires. Reason (R) : In the stress-strain curve of ductile metals, the length between the points representing elastic limit and breaking point is very small.
• To determine the Young modulus of a wire, several measurements are taken. In which row can the measurement not be taken directly with the stated apparatus?
• The property to restore the natural shape or to oppose the deformation is called:
• Assertion For small deformations, the stress and strain are proportional to each other Reason A class of solids called elastomers does not obey Hooke's law.
• A metal cube of side \( 10 \mathrm{cm} \) is subjected to a shearing stress of \( 10^{4} N m^{-2} \). The modulus of rigidity if the top of the cube is displaced by \( 0.05 \mathrm{cm} \) with respect to its bottom is
• The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied?

⚔️ Practice NEET Physics free + battle 1v1 →