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1aur chaiyya kya

CHAPTER 9 : - MECHANICAL PROPERTIES OF SOLIDS
ONE MARK QUESTIONS:
1. What is elasticity of a body?
2. What is plasticity?
3. Which property of a body is responsible for regaining original shape and size of a body when deforming force
acting on it is removed?
4. Elasticity is an internal property of a matter. Is it true or false?
5. What is the cause of the elasticity?
6. What is plastic substance?
7. Give one example for plastic substance.
8. Define stress.
9. Write the expression for magnitude of the stress.
10. Write the S.I unit of the stress.
11. Write the dimensional formula of the stress.
12. Dimensional formula of stress is same as that of the pressure. Is it true or false?
13. Stress is a vector quantity. Is it true or false?
14. Define strain.
15. Why strain is unit less and dimensionless physical quantity?
16. Define longitudinal strain.
17. Write the expression for longitudinal strain.
18. Define volume strain.
19. Write the expression for volume strain.
20. Define shearing strain.
21. Define elastic limit. (yield strength.)
22. Define ultimate tensile strength.
23. What are elastomers?
24. Elastomers does not obey Hooke`s law. Is it true or false?
25. Give one example for elastomers.
26. Define modulus of elasticity.
27. Modulus of elasticity of a body is dependent on the dimensions of a body. Is it true or false?
28. Dimensional formula of modulus of elasticity is same as that of the stress. Is it true or false?
29. Define Young`s modulus.
30. Write the expression for magnitude of the Young`s modulus.
31. What is the S.I unit of the Young`s modulus?
32. Write the dimensional formula of the Young`s modulus.
33. Why steel is preferred in heavy duty machines and in structural design?
34. Why springs are manufactured in steel instead of copper?
35. Define shear modulus or modulus of rigidity.
36. Define bulk modulus.
37. What is compressibility?
38. Solid are least are compressible since they have larger value of bulk modulus. Is it true or false?
39. Young`s modulus and shear modulus are relevant only for solid. Why?
40. Young`s modulus of rubber is greater than that of steel. Is it true or false?
41. Rubber is more elastic than that of steel. Is it true or false?
42. What is the buckling of the material of the road?
43. Stretching of coil is measured by its shearing modulus. Is it true or false?
44. Why load baring bar has cross sectional shape of the type I.
45. Why pillars or columns of the bridges and buildings have distributed shape at their ends?
46. What is the value of young`s modulus for a perfectly rigid body?
47. Why liquid and gas do not posses modulus of rigidity?
48. Write the S.I for the compressibility.
49. How does modulus of elasticity vary with increase of temperature of the body?
50. The material for given load stretches to a little extent is a more elastic body. Is it true or false
2
TWO MARK QUESTIONS:
1. State and explain Hooke’s law.
2. Mention any two types of stress.
3. Mention any two types of strain.
4. Draw the typical stress-strain curve for a metal.
5. Which is more elastic-steel or rubber? Why?
6. Explain elastic behavior of the solid.
7. Write the expression for Young`s modulus of the material of the wire under stretching. Explain the terms.
8. Write the expression for rigidity modulus of the material. Explain the terms.
9. Write the expression for bulk modulus of the material. Explain the terms.
10. A square lead slab of side 50cm and thickness 10cm subjected to shearing force of 9X104N.Calculate the
shearing stress acting on the slab.
11. Write the expression for sag or depression of a bar when it is loaded at the middle. Explain the terms.
12. Write the expression for compressibility and explain the terms
13. Distinguish between ductile material and brittle material.
14. Write two application of elastic behavior of the material.
15. Mention two methods of decreasing the depression in the beam which loaded at the middle with weight.
16. A steel rod of area of cross section 3.14x10-4m2 is stretched by a force of 100kN. Calculate the stress acting
on the rod
17.The stress- strain graphs for two material A and B are shown in the figure
Stress A stress B
strain strain
Which of the material has the greater Young’s modulus? And which material is more elastic?
18.Compute the fractional change in the volume of glass sphere when subjected to a hydraulic pressure of
1.013x106Nm-2. Given bulk modulus of glass is 3.7x1010 Nm-2
FOUR MARK QUESTIONS:
1.Define terms stress and strain. Draw the stress verses strain graph for a metallic wire stretched upto the
fracture point
2. Define the following terms
a) Elastic limit b) permanent set c) plastic deformation d) fracture point
3. State and explain Hooke’s law. Define modulus of elasticity and write its dimensional formula
FIVE MARK QUESTIONS:
1. Draw typical stress – strain graph for a metal and explain the important features in it.
2. Explain the experiment to determine Young’s modulus of the material wire under stretching
FIVE MARK PROBLEMS:
1. A steel rod of radius 10mm and length 2m is stretched by a force of 100kN along its length. The elongation in
the wire is 3.2mm. Find the stress and Young’s modulus of the material of the rod.
2. The upper face of a cube of edge 1m moves through a distance of 1mm relative to the lower fixed surface
under action of a tangential force 1.5x108N. Calculate tangential stress and rigidity modulus.
3. When a rubber ball is taken in deep of 100m in sea its volume is decrease by 0.1% due to hydraulic stress. If
the density of sea water is 1000kgm-3, calculate the bulk modulus and compressibility of the rubber
4.A steel wire of length 5m and cross section 3x10-5m2 stretched by the same amount as copper of length 3.7m
and cross section 4x10-5m2 under given load. Find the ratio of Young’s modulus of steel to that of copper
5. Two wires of area of cross section 5x10-6m2, one made of steel
and the other made of brass are loaded as shown. The unloaded steel wire of length 1.5m
length of steel wire is 1.5m and that of brass wire is 1m. 4kg
Find the elongations in each wires. Y for Brass wire of length 1m
steel is2x1011 Nm-2 and for brass is0.91x1011Nm-2
6kg
6.Find the force required to stretch a wire of area of cross section 2x10-4 m2 so that its length becomes 1.5 times
original length . Young’s modulus=3.6x1011Nm-2.
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