strength of materials MCQs – Page 4

Practise focused strength of materials questions with marked answers for exam preparation and subject revision.

strength of materials Mcqs

61. The weight of a body is due to____________________?
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A. force of attraction experienced by par-ticles

B. gravitational pull exerted by the earth

C. gravitational force of attraction towards the centre of the earth

D. forces experienced by body in atmos-phere

E. centripetal force of earth

62. On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be__________________?
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A. away from the wall at its upper end

B. upwards at its upper end

C. towards the wall at its upper end

D. none of the above

E. downwards at its upper end

63. Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction__________________?
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A. horizontally

B. at an angle equal to the angle of friction to the inclined plane

C. along the plane

D. unpredictable

E. vertically

64. 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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A. maximum

B. same as the force applied

C. infinity

D. minimum

E. zero

65. Which of the following is not the unit of power ?
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A. kcal/sec

B. hp (horse power)

C. kg m/sec

D. kW (kilowatt)

E. kcal/kg sec

66. In the lever of third order, load W, effort P and fulcrum F are oriented as follows_________________?
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A. W, P and F all on one side

B. P between W and F

C. none of the above

D. W between P and F

E. F between W and P

67. If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either__________________?
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A. at least two of them must meet

B. be all parallel

C. none of the above

D. all the above are correct

E. meet in a point

68. The resolved part of the resultant of two forces inclined at an angle 9 in a given direction is equal to__________________?
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A. the algebraic sum of the resolved parts of the forces in the given direction

B. the sum of the resolved parts of the forces in the given direction

C. the sum of the forces multiplied by the sine of 9

D. the difference of the forces multiplied by the cosine of 9

E. the sum of the forces multiplied by the tangent of 9

69. Tangent of angle of friction is equal to_________________?
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A. angle of repose

B. friction force

C. limiting friction

D. kinetic friction

E. coefficient of friction

70. Which of the following is the example of lever of first order________________?
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A. pair of clinical tongs

B. all of the above

C. none of the above

D. arm of man

E. pair of scissors

71. If n = number of members andy = number of joints, then for a perfect frame, n =_______________?
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A. j-l

B. j-2

C. 2/-3

D. 2/ -4

E. /-2

72. Which of the following is not the unit of energy________________?
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A. watt hours

B. kcal

C. kg m x (m/sec)2

D. wattr

E. kg m

73. According to principle of moments_________________?
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A. if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero

B. none of the above

C. positive and negative couples can be balanced

D. the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point

E. if a system of coplanar forces is in equilibrium, then their algebraic sum is zero

74. Which of the following is not a scalar quantity__________________?
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A. mass

B. volume

C. density

D. time

E. acceleration

75. 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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A. kinematic friction

B. limiting friction

C. static friction

D. repose

E. friction

76. Which of the following do not have identical dimensions ?
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A. Moment of a force and angular momentum

B. Torque and work

C. Torque and energy

D. Momentum and impulse

E. Kinetic energy and potential energy

77. 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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A. 0.5 cm

B. 0.25 cm

C. 2.5 cm

D. 1.5 cm

E. 1.0 cm

78. Center of percussion is______________?
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A. point of suspension

B. the point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis

C. the point of C.G.

D. the point in a body about which it can rotate horizontally and oscillate under the influence of gravity

E. the point of metacentre

79. Pick up the incorrect statement from the following _______________?
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A. The C.G. of a rectangle is at the inter-section of its diagonals

B. The C.G. of a circle is at its center

C. The C-G. of an ellipse is at its center

D. The C.G. of a triangle is at the intersection of its medians

E. The C.G. of a semicircle is at a distance of r/2 from the center

80. A particle moves along a straight line such that distance (x) traversed in t seconds is given by x = t2 (t 4), the acceleration of the particle will be given by the equation_________________?
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A. 3t2-lt

B. 6f-4

C. 6t2-8t

D. 6f-8

E. 3t2+2t

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