Strength of Materials

A. reaction of any smooth surface with which the body is in contact
B. reaction of a rough surface of a body which rolls on it without slipping
C. reaction at a point or an axis, fixed in space, around which a body is con-strained to turn
D. all of the above
E. none of the above

A. 20 kg, – ve sense
B. 20 kg, + ve sense
C. 10 kg, + ve sense
D. 10 kg, – ve sense
E. 45 kg, + ve sense

A. area of contact
B. shape of surfaces
C. strength of surfaces
D. nature of surface
E. all of the above

A. coefficient of friction
B. angle of friction
C. angle of repose
D. sliding friction
E. friction resistance

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
E. none of the above

A. post friction
B. limiting friction
C. kinematic friction
D. frictional resistance
E. dynamic friction

A. proportional to normal load between the surfaces
B. dependent on the materials of contact surface
C. proportional to velocity of sliding
D. independent of the area of contact surfaces
E. none of the above is wrong statement

A. 3t2-lt
B. 3t2+2t
C. 6f-8
D. 6f-4
E. 6t2-8t

A. 0°
B. 30°
C. 45°
D. 60°
E. 90°

A. bodies having relative motion
B. two dry surfaces
C. two lubricated surfaces
D. solids and liquids
E. electrically charged particles