engineering mechanics MCQs – Page 4

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

engineering mechanics Mcqs

61. Two non-collinear parallel equal forces acting in opposite direction__________________?
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A. constitute a moment of couple

B. balance each other

C. constitute a couple

D. constitute a resultant couple

E. constitute a moment

62. The units of moment of inertia of mass are ________________?
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A. kg m2

B. m4

C. kg/m2

D. kg/m

E. m2/kg

63. A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if____________________?
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A. the floor is smooth, the wall is rough

B. the floor is rough, the wall is smooth

C. the floor and wall both are smooth surfaces

D. the floor and wall both are rough surfaces

E. will be in equilibrium under all conditions

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

B. 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

C. none of the above

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

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

65. When trying to turn a key into a lock, following is applied _____________________?
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A. moment

B. coplanar force

C. couple

D. non-coplanar forces

E. lever

66. The algebraic sum of moments of the forces forming couple about any point in their plane is_________________?
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A. equal to the moment of the couple

B. constant

C. both of above are correct

D. both of above are wrong

E. none of the above

67. 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

E. at distance from the plane base 3r

68. Center of gravity of a solid cone lies on the axis at the height _____________________?
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A. one-third of the total height above base

B. one-half of the total height above base

C. none of the above

D. one-fourth of the total height above base

E. three-eighth of the total height above the base

69. 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. none of the above

B. more inclined when moving

C. less inclined when standing

D. more inclined when standing

E. less inclined when moving

70. Dynamic friction as compared to static friction is___________________?
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A. less

B. more

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

D. has no correlation

E. same

71. Which of the following is not a vector quantity __________________?
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A. velocity

B. acceleration

C. weight

D. force

E. moment

72. Which is the correct statement about law of polygon of forces ?
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A. if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium

B. a polygon taken in order, then the forces are in equilibrium

C. if a polygon representing forces acting at a point is closed then forces are in equilibrium

D. if any number of forces acting at a point can be represented by the sides

E. if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium

F. none of the above.

73. 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. coplanar non-concurrent forces

B. non-coplanar non-concurrent forces

C. intersecting forces

D. none of the above

E. non-coplanar concurrent forces

74. 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. 0.25 cm

B. 2.5 cm

C. 1.0 cm

D. 0.5 cm