Question

Which of the following factors can bring about a change in the elastic properties of a material?

• A. Hammering and annealing
• B. Change in temperature
• C. Impurity in substance
• D. All of the above

Answer 1

The correct option is D

All of the above

Following are the factors affecting the elasticity of the material:

Option A

Hammering and annealing

1. By hammering, the crystal grains are broken into smaller units which results in an increase in the elasticity of the material.
2. Annealing is done by slowly heating and then cooling the materials. This results in a decrease in the elasticity of the material.

Option A is correct

Option B

Change in temperature

1. As the temperature increases, intermolecular forces decrease, resulting in a decrease in elasticity.

Option B is correct

Option C,

Impurity in substance

1. Depending on the nature of the impurities present in a substance, the elasticity of a material can either increase or decrease.

Option C is correct.

Option D,

1. Since all the three options A, B, and C, are correct,

Hence, option D is correct.