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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 cable is cut into two equal lengths. How the breaking force will change, if two parts are connected in parallel?

Breaking force is given by breaking stress x Area of cross section

If F is the force required to break the wire of area of cross section a, then breaking force becomes 2F.

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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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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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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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