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__________________?

A. 20 kg, – ve sense
B. 20 kg, + ve sense
C. 10 kg, + ve sense
D. 10 kg, – ve sense

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

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 con-strained to turn
D. All of the above

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___________________?

A. 2.5 cm
B. 3.0 cm
C. 4.0 cm
D. 5.0 cm

The center of percussion of a solid cylinder of radius r resting on a horizontal plane will be_________________?

A. R/2
B. 2r/3
C. R/a
D. 3r/2

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____________________?

A. 0.5 cm
B. 1.0 cm
C. 1.5 cm
D. 2.5 cm

A heavy string attached at two ends at same horizontal level and when central dip is very small approaches the following curve ____________________?

A. Catenary
B. Parabola
C. Hyperbola
D. Elliptical

The units of moment of inertia of mass are ________________?

A. Kg m2
B. M4
C. Kg/m2
D. Kg/m

Center of gravity of a thin hollow cone lies on the axis at a height of ___________________?

A. One-fourth of the total height above base
B. One-third of the total height above base
C. One-half of the total height above base
D. Three-eighth of the total height above the base

The center of percussion of the homogeneous rod of length L suspended at the top will be___________________?

A. L/2
B. L/3
C. 3l/4
D. 2l/3