strength of materials MCQs – Page 3

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

strength of materials Mcqs
41. Forces are called coplanar when all of them acting on body lie in________________?
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A. different planes

B. different points

C. perpendicular planes

D. one point

E. one plane
42. Kinetic friction is the________________?
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A. the friction force acting when the body is in motion

B. ratio of limiting friction and normal reaction

C. dynamic friction

D. tangent of angle between normal reac-tion and the resultant of normal reac-tion and the limiting friction

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

43. The centre of percussion of a solid cylinder of radius r resting on a horizontal plane will be______________?
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A. r/2

B. 3r/A

C. 3r/2

D. r/A

E. 2r/3

44. In actual machines______________?
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A. none of the above

B. mechanical advantage is greater than velocity ratio

C. mechanical advantage is less than velocity ratio

D. mechanical advantage is unity

E. mechanical advantage is equal to velocity ratio

45. A trolley wire weighs 1.2 kg per meter length. The ends of the wire are attached to two poles 20 meters apart. If the horizontal tension is 1500 kg find the dip in the middle of the span________________?
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A. 2.0 cm

B. 4.0 cm

C. 2.5 cm

D. 3.0 cm

E. 5.0 cm

46. A single force and a couple acting in the same plane upon a rigid body________________?
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A. cannot balance each other

B. are equivalent

C. balance each other

D. none of the above

E. produce moment of a couple

47. The center of gravity of a triangle lies at the point of__________________?
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A. intersection of its altitudes

B. all of the above

C. intersection of diagonals

D. intersection of bisector of angles

E. concurrence of the medians
48. The center of gravity of a uniform lamina lies at_______________?
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A. the center of heavy portion

B. the bottom surface

C. all of the above

D. the mid point of its axis

E. none of the above

49. Forces are called concurrent when their lines of action meet in_______________?
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A. different planes

B. two points

C. perpendicular planes

D. one point

E. plane

50. Which of the following is not the unit of work, energy and heat ?
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A. kcal

B. kWhr

C. hp

D. kg m

E. hp hr

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