A number of forces acting simultaneously on a particle of a body

 

(A) may be replace by a couple

 

(B) may be replaced by a single force through C.G. of the body

 

(C) may be replaced by a single fore

 

(D) may not be replaced by a single force

The forces which meet at one point and have their lines of action in different planes are called

(A) intersecting forces

(B) coplaner non concurrent forces

(C) non coplaner concurrent forces

(D) non coplaner noncurrent forces

The maximum frictional force which comes into play, when a body just begins to slide over the surface of a other body, is known as

(A) limiting friction

(B) rolling friction

(C) sliding friction

(D) none of these

If rain falls in the opposite direction of the movement of a pedestrian, he has to hold his umbrella

(A) more inclined when moving

(B) less inclined when moving

(C) less inclined when standing

(D) more inclined when standing

The force acting on a point on the surface of a rigid body may be considered to act

(A) at the centre of gravity of the body

(B) on the periphery of the body

(C) at any point on the surface normal to the line of action of the force

(D) on any point on the line of action of the force

A smooth cylinder lying on its convex surface remains

(A) in neutral equilibrium

(B) out of equilibrium

(C) in stable equilibrium

(D) in unstable equilibrium

Centre of gravity of a thin hollow cone lies on the axis of symmetry at a height of

(A) one half of the total height above base

(B) one fourth of the total height above base

(C) one third of the total height above base

(D) none of these

Centrifugal force acting on a body, moving along a circular path, will be

(A) equal and opposite to centripetal force

(B) equal and similar to centripetal force

(C) inversely proportional to centripetal force

(D) proportional to centripetal force

The angle of projection for a range is equal to the distance through which the particle would have fallen in order to acquire a velocity equal to the velocity of projection, will be

(A) 30°

(B) 60°

(C) 75°

(D) 90°

When a body moves round a fixed axis, it has

(A) a translatory

(B) a rotary motion

(C) a circular motion

(D) a rotary motion and translatory motion

The total time of collision and restitution of two bodies is called

(A) period of collision

(B) period of impact

(C) time of collision

(D) all the above