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

The velocity of a moving body, is

(A) a vector quantity

(B) a scalar quantity

(C) a scalar as well as a vector quantity

(D) none of these

Two forces act an angle of 120°. If the greater force is 50 kg and their resultant is perpendicular to the smaller force, the smaller force is

(A) 10 kg

(B) 20 kg

(C) 25 kg

(D) 35 kg

The motion of a bicycle wheel is

(A) curvilinear

(B) translatory

(C) rotary

(D) rotary and translatory

Work may be defined as

(A) force x acceleration

(B) force x velocity

(C) force x distance

(D) none of these

A geo-stationary satellite is one which orbits the earth with a velocity of rotation of

(A) pole

(B) sun

(C) earth

(D) moon

For a body moving with simple harmonic motion, the number of cycles per second, is known as its

(A) oscillation

(B) frequency

(C) periodic time

(D) amplitude