engineering mechanics MCQs – Page 3

Practise focused engineering mechanics questions with marked answers for exam preparation and subject revision.

engineering mechanics Mcqs

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

B. kcal/kg sec

C. hp (horse power)

D. kW (kilowatt)

E. kg m/sec

42. On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be_________________?
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A. upwards at its upper end

B. none of the above

C. perpendicular to the wall at its upper end

D. zero at its upper end

E. downwards at its upper end

43. 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. density of metal cant be determined

B. none of the above

C. metal is twice as dense as water

D. metal will float in water

E. metal is twice as dense as unknown fluid

44. A force acting on a body may_________________?
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A. balance the other forces acting on it

B. retard its motion

C. change its motion

D. all of the above

E. introduce internal stresses

45. The C.G. of a plane lamina will not be at its geometrical centre in the case of a__________________?
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A. rectangle

B. circle

C. square

D. equilateral triangle

E. right angled triangle

46. If n = number of members andy = number of joints, then for a perfect frame, n =_________________?
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A. 2/ -4

B. 3/-2

C. 2/-3

D. 2j-l

E. j-2

47. 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. friction

B. limiting friction

C. static friction

D. kinematic friction

E. repose

48. The weight of a body is due to ___________________?
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A. forces experienced by body in atmosphere

B. gravitational force of attraction towards the center of the earth

C. centripetal force of earth

D. gravitational pull exerted by the earth

E. force of attraction experienced by particles

49. If a rigid body is in equilibrium under the action of three forces, then _____________________?
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A. these forces are equal

B. B. and C. above

C. none of the above

D. the lines of action of these forces meet in a point

E. the lines of action of these forces are parallel

50. In actual machines_______________?
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A. mechanical advantage is less than velocity ratio

B. mechanical advantage is unity

C. none of the above

D. mechanical advantage is greater than velocity ratio

E. mechanical advantage is equal to velocity ratio

51. 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. 0

B. 90.

C. 45

D. 60

E. 30

52. Which of the following is not the unit of pressure ?
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A. kg/cm

B. atmosphere

C. ata

D. newton

E. mm of wcl

53. The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is as per the principle of__________________?
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A. forces

B. resolution of forces

C. dependence of forces

D. independence of forces

E. balance of force

54. The center of percussion of the homogeneous rod of length L suspended at the top will be___________________?
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A. 3L/8

B. 2L/3

C. 3L/4

D. L/2

E. L/3

55. The maximum frictional force which comes into play when a body just begins to slide over another surface is called__________________?
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A. sliding friction

B. kinematic friction

C. limiting friction

D. dynamic friction

E. rolling friction

56. 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

57. Effect of a force on a body depends upon ________________?
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A. none of the above

B. direction

C. magnitude

D. all of the above

E. position or line of action

58. If a number of forces act simultaneously on a particle, it is possible _____________________?
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A. to replace them by a single force

B. not a replace them by a single force

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

D. to replace them by a couple

E. to replace them by a couple and a force

59. A cable with a uniformly distributed load per horizontal meter run will take the following shape________________?
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A. part of a circle

B. elliptical

C. hyperbola

D. straight line

E. parabola

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

B. IP cos 9/2

C. Psin 9/2

D. 2P tan 9/2

E. IP sin 9/2

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