651. From a circular plate of diameter 6 cm is cut out a circle whose diameter is a radius of the plate. Find the c.g. of the remainder from the cen!re of circular plate
A.0.5 cm
B.1.0 cm
C.1.5 cm
D.2.5 cm

652. M.I. of a thin circular ring of radius r and mass M about an axis perpendicular to plane of ring is
A.Mr^2
B.(?r^4) /2
C.2/5 Mr^2
D.2/3 Mr^2

653. 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

654. 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

655. 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

656. The coefficient of friction depends on
A.Area of contact
B.Shape of surfaces
C.Strength of surfaces
D.Nature of surface

657. 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

658. 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

659. Which one of the following statements is not correct
A.The tangent of the angle of friction is equal to coefficient of friction
B.The angle of repose is equal to angle of friction
C.The tangent of the angle of repose is equal to coefficient of friction
D.The sine of the angle of repose is equal to coefficient to friction

660. On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be
A.Towards the wall at its upper end
B.Away from the wall at its upper end
C.Upwards at its upper end
D.Downwards at its upper end

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