If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either__________________?

A. Meet in a point
B. Be all parallel
C. At least two of them must meet
D. All the above are correct

The algebraic sum of moments of the forces forming couple about any point in their plane is________________?

A. Equal to the moment of the couple
B. Constant
C. Both of above are correct
D. Both of above are wrong

A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will____________________?

A. Remain horizontal
B. Slant up towards direction of pull
C. Slant down towards direction of pull
D. Unpredictable

Kinetic friction is the________________?

A. Tangent of angle between normal reac-tion and the resultant of normal reac-tion and the limiting friction
B. Ratio of limiting friction and normal reaction
C. The friction force acting when the body is just about to move
D. The friction force acting when the body is in motion

Dynamic friction as compared to static friction is________________?

A. Same
B. More
C. Less
D. May be less of more depending on nature of surfaces and velocity

If rain is falling in the opposite direction of the movement of a pedestrain, he has to hold his umbrella_________________?

A. More inclined when moving
B. Less inclined when moving
C. More inclined when standing
D. Less inclined when standing

A body of weight W on inclined plane of a being pulled up by a horizontal force P will be on the point of motion up the plane when P is equal to___________________?

A. W
B. W sin (a + $)
C. Wtan(a + <|))
D. WAN(a-)

Coefficient of friction is the__________________?

A. Angle between normal reaction and the resultant of normal reaction and the limiting friction
B. Ratio of limiting friction and normal reaction
C. The friction force acting when the body is just about to move
D. The friction force acting when the body is in motion

What are Prime Numbers?

A. Which can be divided by odd numbers
B. Which can be divided by even numbers
C. Which can be divided by number 1 & by itself number
D. Which can be divided by any number

On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be__________________?

A. Downwards at its upper end
B. Upwards at its upper end
C. Perpendicular to the wall at its upper end
D. Zero at its upper end