strength of materials Mcqs
51. In ideal machines________________?
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A. mechanical advantage is greater than velocity ratio

B. mechanical advantage is equal to velocity ratio

C. mechanical advantage is unity

D. none of the above.

E. mechanical advantage is less than velocity ratio

52. Effect of a force on a body depends upon________________?
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A. direction

B. position or line of action

C. magnitude

D. none of the above

E. all of the above

53. The C.G. of a right circular solid cone of height h lies at the following distance from the base_____________?
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A. h/6

B. 3/i/5

C. h/2

D. J/3

E. h/4
54. Which one of the following statements is not correct_________________?
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A. the tangent of the angle of friction is equal to coefficient of friction

B. none of the above

C. the sine of the angle of repose is equal to coefficient to friction

D. the tangent of the angle of repose is equal to coefficient of friction

E. the angle of repose is equal to angle of friction

55. Coefficient of friction is the__________________?
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A. angle between normal reaction and the resultant of normal reaction and the limiting friction

B. tangent of angle of repose

C. the friction force acting when the body is just about to move

D. ratio of limiting friction and normal reaction

E. the friction force acting when the body is in motion

56. The forces, which meet at one point, but their lines of action do not lie in a plane, are called______________?
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A. none of the above

B. intersecting forces

C. coplanar non-concurrent forces

D. non-coplanar non-concurrent forces

E. non-coplanar concurrent forces
57. The C.G. of a solid hemisphere lies on the central radius 3r_______________?
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A. at distance from the plane base or

B. at distance from the plane base 3r

C. at distance from the plane base 3r

D. at distance from the plane base 3r

E. at distance from the plane base

58. Angle oT friction is the___________________?
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A. the ratio of minimum friction force to the friction force acting when the body is just about to move

B. the ratio of minimum friction force to friction force acting when the body is in motion

C. ratio of limiting friction and normal reaction

D. angle between normal reaction and the resultant of normal reaction and the limiting friction

E. ratio of static and dynamic friction

59. The units of moment of inertia of an area are_______________?
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A. m4

B. kg/m2

C. kg/m4

D. m3

E. kg m2

60. A number of forces acting at a point will be in equilibrium if_________________?
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A. their total sum is zero

B. two resolved parts in two directions at right angles are equal

C. sum of resolved parts in any two per-pendicular directions are both zero

D. all of them are inclined equally

E. none of the above

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

81. If three forces acting in different planes can be represented by a triangle, these will be in________________?
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A. full equilibrium

B. unpredictable

C. non-equilibrium

D. none of the above

E. partial equilibrium

82. Two coplanar couples having equal and op-posite moments_________________?
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A. balance each other

B. are equivalent

C. produce a couple and an unbalanced force

D. produce a moment of couple

E. can not balance each other
83. Dynamic friction as compared to static friction is________________?
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A. has no correlation

B. same

C. more

D. less

E. may be less of more depending on nature of surfaces and velocity

84. If a number of forces act simultaneously on a particle, it is possible_________________?
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A. to replace them by a couple

B. to replace them by a single force through C.G.

C. not a replace them by a single force

D. to replace them by a couple and a force

E. to replace them by a single force
85. A pair of smiths tongs is an example of the lever of__________________?
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A. fourth order

B. second order

C. zeioth order

D. third order

E. first order

86. According to principle of transmissibility of forces, the effect of a force upon a body is_______________?
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A. minimum when it acts at the C.G. of the body

B. different at different points in its line of action

C. the same at every point in its line of action

D. maximum when it acts at the center of gravity of a body

E. none of the above

87. According to law of triangle of forces______________?
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A. three forces acting at a point will be in equilibrium

B. three forces acting at a point can be represented by a triangle, each side being proportional to force

C. none of the above

D. if three forces acting upon a patticle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium

E. if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two

88. If rain is falling in the opposite direction of the movement of a pedestrain, he has to hold his umbrella_________________?
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A. less inclined when moving

B. more inclined when standing

C. more inclined when moving

D. less inclined when standing

E. none of the above

89. A projectile is fired at an angle 9 to the vertical. Its horizontal range will be maximum when 9 is_________________?
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A. 60

B. 45

C. 0

D. 30

E. 90

90. A framed structure is perfect if it contains members equal to________________?
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A. n 2

B. 2n-l

C. 2n-3

D. 3n-2

E. n-l

91. Two non-collinear parallel equal forces acting in opposite direction________________?
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A. constitute a resultant couple

B. constitute a moment of couple

C. constitute a moment

D. balance each other

E. constitute a couple
92. A force acting on a body may_______________?
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A. retard its motion

B. introduce internal stresses

C. change its motion

D. all of the above

E. balance the other forces acting on it

93. The unit of power in S.I. units is______________?
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A. pascal per sec

B. newton meter

C. watt

D. joule

E. kilogram meter/sec

94. A body moves, from rest with a constant acceleration of 5 m per sec. The distance covered in 5 sec is most nearly________________?
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A. 38 m

B. 96 m

C. 124 m

D. 240 m

E. 62.5 m
95. 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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A. circle

B. parabola

C. hyperbola

D. ellipse

E. none of the above

96. If two equal forces of magnitude P act at an angle 9, their resultant will be________________?
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A. Psin 9/2

B. P/2 cos 9/2

C. 2P tan 9/2

D. IP sin 9/2

E. IP cos 9/2
97. A sample of metal weighs 219 gms in air, 180 gms in water, 120 gms in an unknown fluid. Then which is correct statement about density of metal________________?
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A. metal will float in water

B. metal is twice as dense as unknown fluid

C. none of the above

D. density of metal cant be determined

E. metal is twice as dense as water

98. The possible loading in various members of framed structures are_______________?
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A. shear or tension

B. all of the above

C. buckling or shear

D. compression or tension

E. bending