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Mechanical Properties of Solids

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
What are the factors that affect elasticity? In what way they affect its value?

The elasticity of a material is affected by the following factors:

(i) Effect of temperature: On heating, mostly the elasticity of materials decreases.

(ii) Effect of impurities: Depending upon the nature of impurity, the elasticity of materials may increase or decrease.

(iii) Annealing: Annealing decreases the elasticity of materials.

(iv) Hammering and rolling: This process increases the elasticity of materials.

NoteAnnealing is a heat process where a metal is heated to a specific temperature /colour and then allowed to cool slowly. This softens the metal which means it can be cut and shaped more easily. Iron rod is heated till it turns red-hot.

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What do you understand by intermolecular forces?

Intermolecular force is the force between the molecules of the substance is called intermolecular force.

There is a dipole-dipole interaction between the molecules.
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What is the force of adhesion?

Adhesive force is the attractive force between two unlike molecules. They are caused by forces acting between two substances like electrostatic force (attraction due to opposing charges), mechanical force etc.

E.g., Force of attraction between gum and paper.

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What is the nature of inter-atomic or inter-molecular forces?

Inter-atomic or inter-molecular forces are electrostatic in nature.

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What is the force of cohesion?

Cohesive attraction or cohesive force is the force of attraction between same types of molecules sticking together.
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Define interatomic forces and give an example?

The force between atoms of the molecule is called interatomic force.

E.g.The nucleus and electron cloud of a molecule is binded by electrostatic force.
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