Strength of Materials MCQ

1. The B.M. diagram of the beam shown in below figure, is

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2. The value of Poisson's ratio always remains

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3. In a bar of large length when held vertically and subjected to a load at its lower end, its ownweight produces additional stress. The maximum stress will be

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4. Which of the following is not the unit of distance?

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5. Shear deflection of a cantilever of length L, cross sectional area A and shear modulus G, subjected to w/m u.d.l., is

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6. The shear force on a simply supported beam is proportional to

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7. The unit of work or energy in S.I. units is

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8. A beam of length L supported on two intermediate rollers carries a uniformly distributed load on its entire length. If sagging B.M. and hogging B.M. of the beam are equal, the length of each overhang, is

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9. The direction of the reaction at support B of a truss shown in below figure will be

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10. If Z and I are the section modulus and moment of inertia of the section, the shear force F and bending moment M at a section are related by

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11. In a three hinged arch, the shear force is usually

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12. The bending moment at C of a portal frame shown in below figure is

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13. If the rivets in adjacent rows are staggered and outermost row has only one rivet, the arrangement of the rivets, is called

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14. On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be

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15. If two tensile forces mutually perpendicular act on a rectangular parallelepiped bar are equal, the resulting elongation of the pipe, is

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16. If a rectangular beam measuring 10 × 18 × 400 cm carries a uniformly distributed load such that the bending stress developed is 100 kg/cm2 . The intensity of the load per metre length, is

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17. From a circular plate of diameter 6 cm is cut out a circle whose diameter is a radius of the plate. Find the e.g. of the remainder from the center of circular plate

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18. Maximum deflection of a

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19. A triangular section having base b, height h, is placed with its base horizontal. If the shear stress at a depth y from top is q, the maximum shear stress is

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20. A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if

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21. A 8 metre long simply supported rectangular beam which carries a distributed load 45 kg/m. experiences a maximum fibre stress 160 kg/cm2 . If the moment of inertia of the beam is 640 cm4 , the overall depth of the beam is

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22. Pick up the incorrect statement

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23. Which of the following is a vector quantity?

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24. If all the dimensions of a bar are increased in the proportion n : 1, the proportion with which the maximum stress produced in the prismatic bar by its own weight, will increase in the ratio

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25. For structural analysis, Maxwell's reciprocal theorem can be applied to:

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26. The resolved part of the resultant of two forces inclined at an angle in a given direction is equal to

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27. If a circular beam of diameter d experiences a longitudinal strain P/E and a lateral strain 2P/mE, the volumetric strain is

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28. A bending moment may be defined as:

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29. The unit of force in S.I. units is

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30. The property of a material by which it can be drawn to a smaller section, due to tension, is called

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31. The nature of the stress in horizontal members of the truss shown in below figure may be

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32. A long vertical member, subjected to an axial compressive load, is called

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33. The tensile force required to cause an elongation of 0.045 mm in a steel rod of 1000 mm length and 12 mm diameter, is (where E = 2 × 106 kg/cm2)

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34. Beams of uniform strength are preferred to those of uniform section because these are economical for

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35. An arch with three hinges, is a structure

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36. In a solid arch, shear force acts

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37. The reaction at support A of the beam shown in below figure, is

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38. If rain is falling in the opposite direction of the movement of a pedestrian, he has to hold his umbrella

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39. The under mentioned type is simple strain

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40. If a three hinged parabolic arch carries a uniformly distributed load on its entire span, every

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41. The ratio of limiting friction and normal reaction is known as

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42. A beam is said to be of uniform strength, if

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43. A heavy string attached at two ends at same horizontal level and when central dip is very small

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44. Pick up the correct statement from the following:

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45. The deflection of any rectangular beam simply supported, is

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46. The maximum twisting moment a shaft can resist, is the product of the permissible shear stress and

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47. The bending moment at E for the structure shown in below figure, is

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48. The center of gravity of a uniform lamina lies at

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49. Kinetic friction is the

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50. If a suspended body is struck at the centre of percussion, then the pressure on die axis passing through the point of suspension will be

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51. Two coplanar couples having equal and opposite moments

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52. If a number of forces act simultaneously on a particle, it is possible

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53. Which of the following do not have identical dimensions?

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54. According to principle of transmissibility of forces, the effect of a force upon a body is

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55. In determining stresses in frames by methods of sections, the frame is divided into two parts by an

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56. Angle of friction is the

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57. The center of gravity of a triangle lies at the point of

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58. A number of forces acting at a point will be in equilibrium if

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59. According to Lami's theorem

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60. A cable with a uniformly distributed load per horizontal metre run will take the following shape

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61. In ideal machines

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62. In actual machines

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63. The angle which an inclined plane makes with the horizontal when a body placed on it is about to move down is known as angle of

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64. In the lever of third order, load W, effort P and fulcrum F are oriented as follows

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65. A pair of smith’s tongs is an example of the lever of

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66. Which of the following is the example of lever of first order

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67. The M.I. of hollow circular section about a central axis perpendicular to section as compared to its M.I. about horizontal axis is

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68. The G. of a right circular solid cone of height h lies at the following distance from the base

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69. The G. of a plane lamina will not be at its geometrical centre in the case of a

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70. The G. of a solid hemisphere lies on the central radius 3r

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71. A sample of metal weighs 219 gms in air, 180 gms in water, 120 gms in an unknown flui Then which is correct statement about density of metal

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72. Which of the following is not the unit of energy

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73. Which of the following is the locus of a point that moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one

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74. A flywheel on a motor goes from rest to 1000 rpm in 6 se The number of revolutions made is nearly equal to

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75. A body moves, from rest with a constant acceleration of 5 m per se The distance covered in 5 sec is most nearly

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76. If n = number of members andy = number of joints, then for a perfect frame, n =

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77. If three forces acting in different planes can be represented by a triangle, these will be in

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78. The necessary condition for forces to be in equilibrium is that these should be

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79. The co-efficient of friction depends upon

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80. The maximum frictional force which comes into play when a body just begins to slide over another surface is called

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81. If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either

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82. A single force and a couple acting in the same plane upon a rigid body

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83. The algebraic sum of moments of the forces forming couple about any point in their plane is

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84. A particle inside a hollow sphere of radius r, having coefficient of friction -rr can rest upto height of

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85. A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will

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86. The effort required to lift a load W on a screw jack with helix angle a and angle of friction

Wtan(a + <)>)

Wtan(a-<)>)

Wcos(a + )

Wsin(a + <(>)

W (sin a + cos )

Answer

Correct Answer: Wtan(a + <)>)

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Check Answer

87. Tangent of angle of friction is equal to

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88. Dynamic friction as compared to static friction is

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89. Coulomb friction is the friction between

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90. Limiting force of friction is the

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91. A projectile is fired at an angle 9 to the vertical. Its horizontal range will be maximum when 9 is

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92. If rain is falling in the opposite direction of the movement of a pedestrain, he has to hold his umbrella

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93. Shear stress induced in a shaft subjected to tension will be

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94. A key is subjected to side pressure as well at shearing forces. These pressures are called

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95. The value of shear stress which is induced in the shaft due to the applied couple varies

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96. The torsional rigidity of a shaft is expressed by the

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97. The safe twisting moment for a compound shaft is equal to the

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98. Longitudinal stress in a thin cylinder is

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99. A cylindrical section having no joint is known as

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100. A boiler shell 200 cm diameter and plate thickness 1.5 cm is subjected to internal pressure of 1.5 MN/m , then the hoop stress will be

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