901. The M.I, of a thin spherical shell, is
A. Mr4I2
B. Mr2
C. 2/3Mr2
D. 2J5Mr2
902. M.I. of solid sphere, is
A. 2/3Mr2
B. 215Mr2
C. Mr2
D. itr4/2
903. The maximum frictional force which comes into play, when a body just begins to slide over the surface of a an other body, is known
A. sliding friction
B. rolling friction
C. limiting friction
D. none of these.
904. The angle of friction is :
A. The ratio of the friction and the normal reaction
B. The force of friction when the body is in motion
C. The angle between the normal reaction and the resultant of normal raction and limiting friction
D. The force of friction at which the body is just about to move.
905. Kinetic friction may be defined as
A. friction force acting when the body is just about to move
B. friction force acting when the body is in motion
C. angle between normal reaction and resultant of normal reaction and limiting friction
D. ratio of limiting friction and normal reaction.
906. The angle which an inclined surface makes with the horiontal when a body placed on it is on the point of moving down, is called
A. angle of repose
B. angle of friction
C. angle of inclination
D. none of these.
907. On a ladder resisting on a smooth ground and leaning against a rough vertical wall, the force of friction acts
A. towards the wall at its upper end
B. away from the wall at its upper end
C. upwards at its upper end
D. downwards at its upper end
908. On a ladder resting on a rough ground and leaning against a smooth vertical wall, the force of friction acts
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
909. A block of weight 50 kg is placed on a horizontal plane. When a horizontal force of 18 kg is applied, the block is just on the point of motion. The angle of friction is
A. 17?48′
B. 18?48′
C. 19?48′
D. 20?48′
910. The velocity of a moving body, is
A. a vector quantity
B. a scalar quantity
C. a constant quantity
D. none of these.
NOTE
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