engineering mechanics MCQs – Page 5

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

engineering mechanics Mcqs
81. 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. unpredictable

B. along the plane

C. horizontally

D. vertically

E. at an angle equal to the angle of friction to the inclined plane
82. 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. 5.0 cm

C. 2.5 cm

D. 3.0 cm

E. 4.0 cm
83. In the equation of virtual work, following force is neglected_______________________?
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A. reaction of any smooth surface with which the body is in contact

B. reaction of a rough surface of a body which rolls on it without slipping

C. reaction at a point or an axis, fixed in space, around which a body is con-strained to turn

D. all of the above

E. none of the above

84. 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 triangle is at the intersection of its medians

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

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

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

85. The resultant of the following three couples 20 kg force, 0.5 m arm, $ ve sense 30 kg force, 1 m arm, ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be__________________?
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A. 10 kg, + ve sense

B. 45 kg, + ve sense

C. 20 kg, ve sense

D. 10 kg, ve sense

E. 20 kg, + ve sense

86. Two coplanar couples having equal and opposite moments_________________?
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A. can not balance each other

B. are equivalent

C. produce a couple and an unbalanced force

D. produce a moment of couple

E. balance each other

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

B. intersection of diagonals

C. all of the above

D. concurrence of the medians

E. intersection of bisector of angles

88. The possible loading in various members of framed structures are_________________?
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A. shear or tension

B. all of the above

C. compression or tension

D. bending

E. buckling or shear

89. The ratio of limiting friction and normal reaction is known as _____________________?
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A. angle of friction

B. friction resistance

C. sliding friction

D. coefficient of friction

E. angle of repose

90. The coefficient of friction depends on________________?
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A. shape of surfaces

B. nature of surface

C. strength of surfaces

D. all of the above

E. area of contact

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

B. towards the wall at its upper end

C. none of the above

D. away from the wall at its upper end

E. upwards at its upper end