## Chapter Chosen

Mechanical Properties of Solids

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CBSE Gujarat Board Haryana Board

## Previous Year Papers

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Class 10 Class 12
A wire increases by 10–3 of its length, when a stress of 108N/m2 is applied on it. What is the Young's modulus of material of wire?

Given,
Wire is increased of it's length, i.e., strain = 10-3
Stress = 108N/m2

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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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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 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 nature of inter-atomic or inter-molecular forces?

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

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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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