NEET
- Exam
- NEET
- Subject
- Physics
- Chapter
- Mechanical Properties of Solids
NEET · Physics · Mechanical Properties of Solids
Assertion (a) : Ductile metals are used to prepare thin wires....
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.
Options
- ABoth (A) and (R) are true and (R) is the correct explanation of (A)
- BBoth (A) and (R) are true but (R) is not the correct explanation of (A)
- C(A) is true but (R) is false
- D(A) is false but (R) is true
Correct answer
C. (A) is true but (R) is false
Step-by-step solution
Assertion (A) is true. Ductile metals are materials that can be stretched or drawn into thin wires without breaking. This property, known as ductility, is essential for manufacturing wires for applications like electrical wiring and cables. Gold, silver, and copper are examples of highly ductile metals.
Reason (R) is false. The stress-strain curve for a ductile material has a long plastic deformation region between the elastic limit and the breaking point. This is precisely what defines a ductile material-it can undergo significant permanent deformation (plastic deformation) before it fractures. In contrast, a brittle material has a very small or non-existent plastic region, breaking soon after its elastic limit is reached.
The correct option is (3) (A) is true but (R) is false.