MCQOPTIONS
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MCQOPTIONS
This section includes 398 Mcqs, each offering curated multiple-choice questions to sharpen your Strength of Materials knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
The potential energy stored up in a deformed body is known as |
| A. | Strain energy |
| B. | Potential energy |
| C. | Resilience |
| D. | Deformation energy |
| E. | None of the above |
| Answer» D. Deformation energy | |
| 52. |
For a thin longitudinal cylinder the ratio hoop stress/longitudinal stress is |
| A. | 4 |
| B. | 2 |
| C. | 1 |
| Answer» D. | |
| 53. |
For beam of length L fixed at two ends A and B and loaded W at the centre C the maximum bending moment will |
| A. | Occur at A |
| B. | Occur at B |
| C. | Occur at C |
| D. | (A) and (B) above |
| E. | (A) (B) and (C) above |
| Answer» F. | |
| 54. |
The force required to punch a 25 mm hole in a mild steel pipe 10 mm thich, when ultimate shear stress of the plate is 500 N/mm2 will be nearly |
| A. | 78 kN |
| B. | 98 kN |
| C. | 393 kN |
| D. | 158 kN |
| E. | None of the above |
| Answer» D. 158 kN | |
| 55. |
The units of true strain are |
| A. | cm/cm |
| B. | kg/cm |
| C. | kg-cm/cm |
| D. | Dirnensionless |
| E. | None of the above |
| Answer» E. None of the above | |
| 56. |
Euler's formula is not applicable to columns |
| A. | with both ends free |
| B. | with both ends fixed |
| C. | of composite material |
| D. | having slenderness ratio less than 80 |
| E. | None of the above |
| Answer» E. None of the above | |
| 57. |
A material capable of absorbing large amounts of energy is known as |
| A. | Ductile |
| B. | Shock proof |
| C. | Resilient |
| D. | Hard |
| E. | Tough |
| Answer» F. | |
| 58. |
A uniform steel rope 400 metres long is hung vertically. The weight of the steel is 7.8 gm/cm3 and D = 2100 kg/mm2. The ratio of elongation of first 150 metres to that of first 300 metres would be |
| A. | 1 ; 2 |
| B. | 1 ; 4 |
| C. | 2 ; 1 |
| D. | 4 ; 1 |
| E. | 16 ; 1 |
| Answer» C. 2 ; 1 | |
| 59. |
The strain energy stored in a specimen when strained within elastic limit is known as |
| A. | Proof strain energy |
| B. | Strain energy |
| C. | Elastic limit strain energy |
| D. | Resilience |
| E. | None of the above |
| Answer» E. None of the above | |
| 60. |
Two beams of equal cross-sectional area are subjected to equal bending moment. If one beam has square cross-section and the other has circular section, then |
| A. | The suitability of section will depend on the nature of loading |
| B. | In shear, square section beam will be stronger |
| C. | Both beams will be equally strong |
| D. | Square section beam will be economical |
| E. | Circular section beam will be economical |
| Answer» E. Circular section beam will be economical | |
| 61. |
The slenderness ratio of vertical comumn of square cross-section of 2.5 cm sides and 600 cm length is |
| A. | 500 |
| B. | 200 |
| C. | 100 |
| D. | 900 |
| E. | 1000 |
| Answer» E. 1000 | |
| 62. |
A non-wielding support means |
| A. | Support that restores elongation after the load is removed |
| B. | Slope of the beam at the support is zero |
| C. | Support is frictionless |
| D. | Support that does not elongate |
| E. | Support holds the load firmly and safely |
| Answer» C. Support is frictionless | |
| 63. |
If this shaft is to be replaced by a hollow shaft of texternal diameter 22 mm for the same maximum shear stress and same torque, the internal diameter will be |
| A. | 15.5 mm |
| B. | 11 mm |
| C. | 21 mm |
| D. | 31 mm |
| E. | 51 mm |
| Answer» E. 51 mm | |
| 64. |
The safe working pressure for a spherical vessel 1.5 m diameter and 1.5 cm wall thickness with limiting tensile stress of 450 kg/cm2 would be |
| A. | 18 kg/cm2 |
| B. | 36 kg/cm2 |
| C. | 4.5 km/cm3 |
| D. | 9 kg/cm2 |
| E. | 45 kg/cm2 |
| Answer» B. 36 kg/cm2 | |
| 65. |
If the value of Young's modulus of elasticity for a material is zero, it implies that the material |
| A. | is in gaseous state |
| B. | is visco-elastic |
| C. | incompressible |
| D. | plastic |
| E. | None of the above |
| Answer» D. plastic | |
| 66. |
In a three-hinged beam, the bending moment will be zero at |
| A. | the left hinge |
| B. | the right hinge |
| C. | both the hinges |
| D. | the crown |
| E. | None of the above |
| Answer» E. None of the above | |
| 67. |
Along the principal plane subjected to maximum principal shear |
| A. | The maximum shear stress acts |
| B. | The minimum shear stress acts |
| C. | No shear stress acts |
| D. | Any of the above |
| E. | None of the above |
| Answer» D. Any of the above | |
| 68. |
A form factor is introduced in the design of compressive members to represent the effect of |
| A. | local buckling |
| B. | voids |
| C. | grain orientation |
| D. | diagonal buckling |
| E. | None of the above |
| Answer» B. voids | |
| 69. |
A steel shaft 6 mm in diameter turns at 10,000 r.p.m. the safe working stress in shear is 350 kg/cm2. The maximum power that such a shaft may develop is approximately |
| A. | 2 |
| B. | 2.45 |
| C. | 1 |
| D. | 0.5 |
| E. | 1.73 |
| Answer» B. 2.45 | |
| 70. |
Arching of a beam results in |
| A. | increased bending moment throughout |
| B. | reduced bending moment throughout |
| C. | increased bending moment at the support |
| D. | no change in bending moment |
| E. | None of the above |
| Answer» C. increased bending moment at the support | |
| 71. |
A spherical pressure vessel is made of thin magnesium plate 0.25 cm thick. The main diameter of the sphere is 600 cm and allowable stress in tension is 900 kg/cm2. The safe internal gas pressure for the vessel would be |
| A. | 5.5 kg/cm2 |
| B. | 3.0 kg/cm2 |
| C. | 0.5 kg/cm2 |
| D. | 4.77 kg/cm2 |
| E. | 1.5 kg/cm2 |
| Answer» F. | |
| 72. |
A cylindrical section having no joint is known as |
| A. | Perfect section |
| B. | Strong section |
| C. | Jointless section |
| D. | Seamless section |
| E. | Stress free section |
| Answer» E. Stress free section | |
| 73. |
In the simple bending theory one of the assumptions usually made is that the plane sections before bending remain plane after bending. This assumption implies that |
| A. | Stress is proportional to the distance from the neutral axis |
| B. | Stress is uniform in the beam cross section |
| C. | Stress is proportional to strain at all section |
| D. | Stress is uniform in the beam cross-section |
| E. | Strain is proportional to the distance from the neutral axis |
| Answer» F. | |
| 74. |
The neutral axis of beam |
| A. | Is subjected to maximum stress |
| B. | Is subjected to maximum shear force |
| C. | Has tensile stress on one side and compressive stress on the other |
| D. | Is in the same plane in which the beam bends |
| E. | None of the above |
| Answer» D. Is in the same plane in which the beam bends | |
| 75. |
For a shear force to be uniform throughout the span of a simply supported beam, it should be subjected to |
| A. | a couple at mid span |
| B. | a couple at any point on the span |
| C. | a uniformly distributed load |
| D. | two concentrated loads spaced at third points |
| E. | None of the above |
| Answer» B. a couple at any point on the span | |
| 76. |
All elastic materials |
| A. | Elongate on the application of load |
| B. | Shrink on the application of load |
| C. | Permanently deform under load |
| D. | Do not deform under load |
| E. | None of the above |
| Answer» B. Shrink on the application of load | |
| 77. |
The shear stress when a circular shaft subjected to torsion is |
| A. | maximum, maximum |
| B. | minimum, minimum |
| C. | maximum, minimum |
| D. | minimum, maximum |
| E. | None of the above |
| Answer» D. minimum, maximum | |
| 78. |
The deflection of a beam may be reduced by |
| A. | decreasing the depth of beam |
| B. | increasing the span |
| C. | providing greater end restrains |
| D. | any of the above methods |
| E. | None of the above |
| Answer» D. any of the above methods | |
| 79. |
Materials exhibiting time bound behaviour are known as |
| A. | Anelastic |
| B. | Visco elastic |
| C. | Reactive |
| D. | Fissile |
| E. | Isentropic |
| Answer» C. Reactive | |
| 80. |
As compared to the Brinell hardness lest, the Rockwell method |
| A. | makes a thinner indentation |
| B. | may be used on thicker materials |
| C. | is much slower |
| D. | all of the above |
| E. | None of the above |
| Answer» B. may be used on thicker materials | |
| 81. |
A dead load is |
| A. | One that can be neglected |
| B. | One that does not exist |
| C. | One that is dead |
| D. | One that remains constant. |
| E. | One that does not move |
| Answer» E. One that does not move | |
| 82. |
Poisson's ratio for cast iron is |
| A. | 0.38 |
| B. | 0.36 |
| C. | 0.27 |
| D. | 0.33 |
| E. | 0.31 |
| Answer» D. 0.33 | |
| 83. |
Two cantilever beams are of equal length. One carries a uniformly distributed load and other carries same load but concentrated at the free end. The ratio of maximum deflection is |
| A. | 2?3 |
| B. | 5?12 |
| C. | 1?3 |
| D. | 1?2 |
| E. | 5?6 |
| Answer» F. | |
| 84. |
For which of the following diameters a seam-less pipe of 3 mm wall thickness will be considered as a thin walled cylinder? |
| A. | 30 mm |
| B. | 60 mm |
| C. | 80 mm |
| D. | 90 mm |
| E. | All of the above |
| Answer» B. 60 mm | |
| 85. |
If the load at the free end of a cantilever beam is increased, the failure will occur |
| A. | Any where between free end and centre |
| B. | At the centre |
| C. | At the free and |
| D. | At the support |
| E. | Any where between free end and support |
| Answer» E. Any where between free end and support | |
| 86. |
The heaviest I section for the same depth is |
| A. | ISMB |
| B. | ISLB |
| C. | ISHB |
| D. | ISWB |
| E. | None of the above |
| Answer» D. ISWB | |
| 87. |
The strain energy of the spring when it is subjected to the greatest load which the spring can carry without suffering permanent distortion is known as |
| A. | Proof strain energy |
| B. | Proof load stress |
| C. | Proof resilience |
| D. | Proof stress |
| E. | Limiting stress |
| Answer» D. Proof stress | |
| 88. |
In case the modulus of elasticity for a material is 200 GN/m2 and Poisson's ratio is 0.25, the modulus of rigidity is |
| A. | 250 GN/m2 |
| B. | 125 GN/m2 |
| C. | 80 GN/m2 |
| D. | 320 GN/m2 |
| E. | None of the above |
| Answer» D. 320 GN/m2 | |
| 89. |
The ratio of average shear stress to maximum shear stress for a circular section is |
| A. | 3?2 |
| B. | 2?3 |
| C. | 4?3 |
| D. | 2 |
| E. | 3?4 |
| Answer» F. | |
| 90. |
In case of thin walled cylinders the ratio of hoop stress to radial stress is |
| A. | 2 |
| B. | 4 |
| C. | None of the above |
| Answer» F. | |
| 91. |
Moment area method is useful determining the following in a beam |
| A. | slope and deflection at point |
| B. | Shear force and bending moment at a point |
| C. | tensile and compressive stresses at a point |
| D. | None of the above |
| E. | None of the above |
| Answer» B. Shear force and bending moment at a point | |
| 92. |
A square steel bar 20 mm on a side is subjected to an axial compressive load of 8 kN. The normal stress acting on plane 30? to the line action of the axial load will be |
| A. | 0.5 N/mm2 |
| B. | 2.5 N/mm2 |
| C. | 50 N/mm2 |
| D. | 550 N/mm2 |
| E. | None of the above |
| Answer» B. 2.5 N/mm2 | |
| 93. |
If unit loads rest upon a beam at two points A and B, the deflection at A due to unit load at B, equals the deflection at B due to the unit load at A. This is known as |
| A. | Rankine's theorem |
| B. | Mohr's hypothesis |
| C. | Castigliano's theorem |
| D. | Maxwell's theorem |
| E. | None of the above |
| Answer» E. None of the above | |
| 94. |
The safe value of stress under which a member subjected to reversible tensile or compressive stress will not fail is known as |
| A. | Safe stress |
| B. | Fatigue stress |
| C. | Endurance limit |
| D. | Proof stress |
| E. | Elastic limit stress |
| Answer» D. Proof stress | |
| 95. |
The bending moment diagram for a cantilever beam subjected to bending moment at the end of the beam would be |
| A. | Rectangle |
| B. | Triangle |
| C. | Parabola |
| D. | Cubic parabola |
| E. | None of the above |
| Answer» B. Triangle | |
| 96. |
A material which recovers fully after unloading but not instantaneously is known as |
| A. | Elastic |
| B. | Partially elastic |
| C. | Anelastic |
| D. | Inelastic |
| E. | Plastic |
| Answer» D. Inelastic | |
| 97. |
For which of following material the value of Poissons ratio is more than 1? |
| A. | Cork |
| B. | Dead mild steel |
| C. | Wood |
| D. | Plastic |
| E. | None of the above |
| Answer» F. | |
| 98. |
For a beam of length L fixed at end A and simply supported at end B and loaded uniformly by a load W the maximum bending moment will occur at |
| A. | Centre C |
| B. | B |
| C. | A |
| D. | Between AC |
| E. | Between CD |
| Answer» D. Between AC | |
| 99. |
The ratio of maximum shear stress to the average shear stress in a rectangular beam subjected to torsion is |
| A. | 4?5 |
| B. | 5?4 |
| C. | 3?4 |
| D. | 3?2 |
| E. | 2?3 |
| Answer» E. 2?3 | |
| 100. |
Strain rosettes are generally used for |
| A. | Measurement of resilience |
| B. | Measurement of proof stress |
| C. | Measurement of shear strain |
| D. | Measurement of longitudinal strains |
| E. | Measurement of load |
| Answer» E. Measurement of load | |