Newton's law of motion of rotation which states, Everybody continues in its state of rest or uniform motion of rotation about an axis unless it is acted upon by some external torque is

 

(A) first law of motion

 

(B) second law of motion

 

(C) third law of motion

 

(D) fourth law of motion

The tension in a cable supporting a lift

(A) is more when the lift is moving downwards

(B) is less when the lift is moving downwards

(C) is less when the lift is moving upwards

(D) remains constant whether it moves downwards or upwards

According to Kennedy's theorem, if three bodies have plane motion, their instantaneous centres lie on

(A) a triangle

(B) two straight lines

(C) a straight line

(D) a point

One Newton force, is

(A) 103 dynes

(B) 104 dynes

(C) 105 dynes

(D) 106 dynes

The motion of a particle moving with S.H.M. from an extremely to the other, constitutes

(A) one full oscillation

(B) two oscillations

(C) half an oscillation

(D) none of these

The angle which an inclined surface makes with the horizontal when a body placed on its is on the point of moving down, is called

(A) angle of inclination

(B) angle of friction

(C) angle of repose

(D) none of these

Which one of the following laws is not applicable to a simple pendulum?

(A) The time period is inversely proportional to √g where g is the acceleration due to gravity

(B) The time period is proportional to √l where l is length

(C) The time period does not depend on its magnitude

(D) The time period is proportional to its length l

The locus of the instantaneous centre of a moving rigid body, is

(A) centroid

(B) involute

(C) straight line

(D) spiral

Engineer's units of force, is

(A) Newton and dyne in absolute units

(B) Dyne in absolute units

(C) Newton in absolute units

(D) All the above

The shape of a suspended cable under its own weight is

(A) catenary

(B) circular

(C) elliptical

(D) parabolic

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