2. The ratio of linear stress to linear strain is called as
Correct : A. modulus of elasticity
3. The modulus of elasticity for mild steel is approximately equal to
Correct : D. 210 kn/mm2
4. When the material is loaded with elastic limit , then the stress is ……. to
strain.
Correct : B. directly proportional
5. The ratio of ultimate tensile stress to the design stress is known as
Correct : C. factor of safety
6. An aluminum member is designed based on
Correct : A. yield stress
7. The poisson's ratio for Cast Iron varies from
Correct : C. 0.23 to 0.27
8. The Poisson’s ratio for steel varies from
Correct : B. 0.25 to 0.33
9. The property of material to absorb shock energy without failure is known
as….
Correct : B. toughness
10. Young’s modulus of Elasticity for perfectly rigid body is….
Correct : C. infinity
11. The stress is….
Correct : C. tensor
12. The Poisson’s ratio for perfectly rigid body is
Correct : B. 0
13. Shearing strain is represented by………
Correct : B. angle of shear
14. Greater the value of modulus of elasticity more…is the material
Correct : B. elastic
15. Stress does not depand upon
Correct : C. modulus of elasticity
16. stress does not depend upon
Correct : C. change in length
17. modulus of elasticity for rubber is ……than that for steel.
Correct : C. smaller than
18. Change in length of the rod due to change in temperature depends on…
Correct : D. all of above
19. The value of K for perfectly rigid body is
Correct : D. infinity
20. Time dependent permanent deformation is called as
Correct : C. creep
21. Figure out the odd point in the following
Correct : D. fracture point
22. Engineering stress strain curve and true stress strain curve are equal up to
Correct : C. yield point
23. Shape of true stress strain curve of material depends upon
Correct : D. all of the above
24. Within elastic limit in a loaded material, stress is
Correct : B. directly proportional to strain
25. The ratio of linear stress to linear strain is known as
Correct : D. modulus of elasticity
26. the ratio of lateral strain to linear strain is known as
Correct : A. poisson's ratio
27. The ratio of shear stress to shear strain is known as
Correct : C. modulus of rigidity
28. The ratio of normal stress of each face of a solid cube to volumetric strain is called
Correct : B. bulk modulus
29. Hooke's law holds good up to
Correct : A. proportional limit
30. The property of material by virtue of which a body returns to its original shape after removal of load is known as
Correct : C. elasticity
31. The work done in producing strain on a material per unit volume is called
Correct : A. resilience
32. The property of material by virtue of which a material can be beaten into plates is called
Correct : B. malleability
33. The Combined effect of external forces acting on body is called
Correct : C. load
34. ………….Load is one which is considered to act at a point.
Correct : C. point
35. The internal resistance which the body offers to meet the load or external force is called
Correct : A. stress
36. The Unit of stress in SI unit is
Correct : D. all of above
37. ……….represents the resistance developed by a unit area of cross section.
Correct : A. unit stress
38. Simple stress is often called
Correct : A. direct stress
39. The deformation per unit length is called……….
Correct : A. strain
40. If L and dL are are length and change in length respectively, then strain is equal to
Correct : A. dl/l
41. If V is the volume of a rectangular bar subjected to a three dimensional stress state and the Poisson's ratio for the material is 0.5, the change in volume of the bar will be __ _.
Correct : D. 0
42. For material Poisson’s ratio is 0.25. Relation between E and G will be
Correct : D. 2.5g
43. The modulus of elasticity of a material is 210 GPa and its Poisson's ratio is 0.4. The modulus of rigidity of the material is
Correct : B. 75
44. The value of factor of safety is always
Correct : A. >1
45. The value of margin of safety is always
Correct : D. >0
46. If the working load is one third of the ultimate load, the factor of safety is
Correct : B. 3
47. If 1 is subtracted from the ratio of yield stress to working stress the quantity obtained is known as
Correct : A. margin of safety
48. Stress does not depend upon
Correct : C. change in length
49. Stress does not depend upon
Correct : C. modulus of elasticity
50. A metal plate of length L and width b has a circle drawn on it. If it is subjected to a compressive stress acting along its width, the circle will
Correct : C. become ellipse with major axis along its length
51. If D is the diameter of the sphere, then volumetric strain is equal to
Correct : C. three times the strain of diameter
52. If L be the length and D be the diameter of cylindrical rod, then volumetric strain of the rod is equal to
Correct : C. strain of length plus twice the strain of diameter
53. the extension per unit length of the rod due to suddenly applied load as compare to same load gradually applied to same rod is
Correct : B. double
54. The tensile force at a distance y from support in a vertical hanging bar of length L whch carries a load P at the bottom is equal to---- where w = weight per unit length
Correct : C. p+w(l-y)
55. Total elongation produced in a bar due to its self weight is given by……….. Where ρ is the density of material in kg/m3
Correct : B. 9.81ρl2/2e
56. The elongation of circular tapered rod is given by…………. Where P=axial pull
and d1, d2= diameters at two ends.
Correct : A. 4pl/πed1d2
57. If a bar of length L m extends by l mm under load W, the strain is
Correct : C. 0.001 l/l
58. Four wires of same material are applied the same load. In which of the following cases, the elongation will be maximum (length, diameter)?
Correct : A. 2m, 1mm
59. If ES = 3 EA , the stress in steel of a composite bar made of aluminium and steel strips each having a cross sectional area of 300 mm2 and subjected to an axial load of 12 kN
Correct : C. 30mpa
60. The modulus of rigidity in terms of modulus of elasticity is given by
Correct : B. e/2(1+γ)
61. The modulus of elasticity in terms of bulk modulus is given by
Correct : D. 3k(1-2γ)
62. The ratio of Young's modulus and bulk modulus is given by
Correct : D. 3(1-2γ)
63. The modulus of elasticity in terms of bulk modulus and modulus of rigidity is given by
Correct : A. 9kg/(3k+g)
64. For a Poisson's ratio of 0.4 for a material the ratio of shear modulus of elasticity to modulus of rigidity is
Correct : D. 5/14
65. A material has modulus of rigidity equal to 0.4x105 N/mm2 and Bulk modulus equal to 0.95 x105 N/mm2 The Young’s modulus value in GPa is..
Correct : B. 105
66. A bar of 30 mm diameter is subjected to an axial force 280 KN length of bar is 400 m and E= 200GPa. Determine volumetric strain if m=4.
Correct : B. 9.9 x 10-4
67. A rail 20 m long is prevented from expansion at both end . If the temperature is raised by 30 0C, Stress induced in rail is.. E=200 Gpa,α =12x10-6/°C
Correct : C. 72mpa
68. A tensile material is having Young’s modulus 2.1 x105 N/mm2 and modulus of Rigidity is 0.82 x105 N/mm2. The value of Bulk Modulus is ..
Correct : B. 1.6 x105 n/mm2
69. A steel rod of length is manufactured at a temperature 200C and its temperature increases upto 1350C.What are thermal stresses induced?
E=200Gpa,α=12*10-6/0C
Correct : D. 276mpa
70. A steel rod of 3m is manufactured at 250C the temperature of rod is increases to 1250C. If free expansion is 3.6mm, what is the temperature stresses produced if 1.5mm expansion is permitted?
Correct : D. 140mpa
71. A steel rod of 3m length is manufactured at 250C the temperature of this rod increases to 1250C. What is the free expansion? Take E=200Gpa,
α=12*10-6/0C,diameter=12mm
Correct : D. 3.6mm
72. A steel tube (E = 200 GPa) has an internal diameter of 40 mm thickness 10 mm and a length of 2 m. If it is subjected to an axial pull of 80 kN, the stress in the tube will be
__ _MPa.
Correct : B. 50.13
73. A steel tube (E= 200Gpa) has an internal diameter of 40 mm, thickness 10 mm and a length of 2 m. If it is subjected to an axial pull of 80 kN, the change in length of the tube will be
__ _mm.
Correct : B. 0.5
74. The axial force in the portion AB of the member shown in Fig. 1.1 is kN.
Correct : A. 50
75. If the member shown in Fig. 1.1 has a square cross section of 25 mm
25 mm and E = 200 GPa, the change in length of portion AB is
mm.
Correct : A. 0.24
76. The axial force in the portion BC of the member shown in Fig. 1.1 is kN.
Correct : D. -40
77. If the member shown in Fig. 1.1 has a
square cross section of 25 mm 25 mm and E = 200 GPa, the change in length of portion CD is ------mm
Correct : B. -0.16
78. The axially loaded composite rod shown in Fig. 1.2 has a uniform cross- sectional area of 500 mm 2 . The modulii of elasticity are Est = 200 GPa, Eal = 70 GPa and Ecu = 120 GPa. The change in length of CD is mm.
Correct : A. 0.15
79. The axially loaded composite rod shown in Fig. 1.2 has a uniform cross- sectional area of 500 mm 2 . The modulii of elasticity are Est = 200 GPa, Eal = 70 GPa and Ecu = 120 GPa. The change in length of the composite rod is mm.
Correct : B. -0.95
80. For the stepped rod shown in Fig. 1.3, the stress is maximum in .
Correct : C. steel
81. For the stepped rod shown in Fig. 1.3,the in .
Correct : A. aluminum
82. A steel bar ABC (E = 200 GPa) is 1 m long. For AB = 0.7 m, it has cross section P area of 500 mm2 and for BC = 0.3 m the cross section area is 400 mm2. The bar is subjected to an axial pull of 100 kN. The stress is maximum in ___ _
Correct : B. bc
83. A stepped bar of steel consists of a pmormtion with cross section area 500 mm2 connected to a portion with cross section area 1000 2. Each portion has a length of 1 m. The modulus of elasticity of steel is
200 GPa. The maximum elongation of the bar by applying an axial tensile force at the ends without exceeding a stress of 100 MPa is
mm.
Correct : B. 0.75
84. The change in length of a rod of uniform circular cross section was found to be 2 mm for some applied force. The change in length of a rod of the same material and length but of half the diameter subjected to the same force will be Mm
Correct : D. 4
85. A strip of steel (E = 200 GPa, 0.25) has a length of 1 m, width of
200 mm and thickness of 10 mm. A line of length 1 m is drawn parallel to its length on one of its side surfaces. When the strip is subjected to an axial tensile force of
100 kN, the length of the line will be
mm.
Correct : B. 1000.25
86. The change in length of a rod of uniform cross section was found to be
2 mm for some applied force. The change in length of a rod of the same material and length but of twice the cross section area subjected to the same force will be__ mm.
Correct : A. 1
87. Two rods have uniform cross section areas in the ratio 1 : 2 and are subjected to axial tensile forces with magnitudes in the ratio 2 : 1. The stresses induced in the two rods will be in the ratio ____ _.
Correct : D. 4 : 1
88. Two rods have uniform cross section areas in the ratio 1 : 2 and are subjected to axial tensile forces with magnitudes in the ratio 1 : 2. The stresses induced in the two rods will be in the ratio ____ _.
Correct : C. 1:1
89. Two rods have uniform cross section areas in the ratio 1 : 2 and are subjected to axial tensile forces of the same magnitude. The stresses induced in the two rods will be in the ratio __ _ .
Correct : B. 2 : 1
90. If an axial force of 15 kN is applied to a rod of 25 mm diameter, length 300 mm, the change in length of the rod was observed to be 0.045 mm. The modulus of elasticity of the material is 200 GPa. The strain in the rod will be ____ _.
Correct : B. 1.5*10-4
91. If an axial force of 1 kN is applied to a rod of 100 mm cross section area produces change in length of 1 mm over a length of 12 m, the modulus of elasticity of the material will be---------
Correct : D. 120gpa
92. If an axial force of 1 kN is applied to a rod of 100 mm2
cross section area, length 5 m and the modulus of elasticity of the material is 100 GPa, the change in length of the rod will be ___ .
Correct : C. 0.5mm
93. The longitudinal stress developed in a rod of cross section area 50 mm2 is 100 MPa. The force acting along its axis is -------
Correct : D. 5.5kn
94. If an axial force of 1 kN is applied to a steel rod of 100 mm2 cross section area, the stress in it will be ___ .
Correct : A. 10mpa
95. Two equal and opposite forces of magnitude 10 kN are applied at the ends of a steel wire to increase its length. The internal force in the
wire will be-----KN
Correct : B. 10
96. The value of factor of safety is always
__ _.
Correct : A. >1
97. The value of margin of safety is always
__ _.
Correct : D. =0
98. The radius of wire stretched by a load is doubled, then its Modulus of elasticity will be..
Correct : D. unaffected
99. The factor of safety depends on
i)Magnitude of external force
ii) Properties of material
iii) Dimension of the component
iv) All of the above
Correct : D. iv
100. The thermal stress is given by where α = coeffeicient of linear expansion
T = Rise in temperature