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Mechanical Engineering Objective Questions { Engineering Mechanics }



50. Pick up the incorrect statement from the following:
A. The C.G. of a circle is at its centre
B. The C.G. of a triangle is at the intersection of its medians
C. The C.G. of a rectangle is at the intersection of its diagonals
D. The C.G. of a semicircle is at a distance of r/2 from the centre
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51. In the equation of virtual work, following force is neglected
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 constrained to turn
D. All of the above
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52. If a suspended body is struck at the centre of percussion, then the pressure on the axis, passing through the point of suspension will be
A. Maximum
B. Minimum
C. Zero
D. Infinity
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53. 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 in will be
A. 20 kg, - ve sense
B. 20 kg, + ve sense
C. 10 kg, + ve sense
D. 10 kg, - ve sense
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54. The coefficient of friction depends on
A. Area of contact
B. Shape of surfaces
C. Strength of surfaces
D. Nature of surface
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55. Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction
A. Along the plane
B. Horizontally
C. Vertically
D. At an angle equal to the angle of friction to the inclined plane
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56. The ratio of limiting friction and normal reaction is known as
A. Coefficient of friction
B. Angle of friction
C. Angle of repose
D. Sliding friction
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