ng and impurity on elasticity 5. Importance of Elasticity 6. Different Elastic Moduli- Young’s Modulus(Y), Bulk Modulus(K), Rigidity Modulus(n) 7. Poisson’s Ratio(σ) 8. Expression for Young’s Modulus(Y), Bulk Modulus(K), Rigidity Modulus(n) 9. Relation Between the Elastic Constants  Relation Between Shearing Strain, Elongation Strain and compression Strain  Relation Between Y, n and σ  Relation Between K, Y and σ  Relation Between K, n and Y  Relation Between K. n and σ 10. Limits of Poison’s II. Bending of Beams 1. Neutral Surface or Neutral Plane 2. Derivation an Expression for Bending Moment 3. Bending Moment of a Beam With Circular and Rectangular Cross Section 4. Derivation an Expression for Young’s Modulus Using Single Cantilever III. Torsion of Cylinder 1. Expression For Couple Per Unit Twist of a Solid Cylinder 2. Torsional Pendulum-Expression for Period of Oscillation 3. Numerical Problems.