Question

Among the following, which is the least elastic?

• A. Steel
• B. Iron
• C. Copper
• D. Rubber

Answer 1

The correct option is D

Rubber

Explanation of the correct option:

The correct answer is option D:

1. The connection between stress (force per unit area) and strain (proportional deformation of an object) is defined by Young's modulus.
2. When a certain load is applied to a solid object, it deforms and when the pressure is released from an elastic item, the body returns to its previous shape.
3. When the same amount of force is given to a steel wire and a rubber wire with the same length and cross-sectional area, the rubber wire extends more easily than the steel wire.

Explanation of the incorrect options:

Options A, B, and C:

1. The strain generated in rubber is comparatively greater than the strain produced in steel, iron, and copper for a comparable amount of tension.
2. Thus, options A, B, and C are incorrect.

Hence, option D is correct.
The least elastic material among the given is rubber.