## Multiple Choice Questions on Turning Effect of Forces

1. Conventionally anticlockwise torque is taken as ………
 A. Negative B.  Positive C. Parallel D. zero

1. A door requires a minimum torque of 80 N m in order to open it. What is the minimum distance of the handle from the hinges, if the door is to be pulled with a force at the handle not greater than 100 N?
 A. 0.6 m B. 1 m C. 0.4 m D. 0.8 m

1. Two children are balanced on opposite sides of a seesaw. If one child leans inward toward the pivot point, her side will
 A. rise B. fall C. insufficient data D. neither rise nor fall

1. A body in equilibrium must not be
 A. at rest B. moving C. rotating D. accelerating

1. The torque in uniformly rotating fan having blade of length 0.5 m is
 A. 0.5 N m B. 2 N m C. -0.5 N m D. 0 N m

1. A force of 100 N is applied perpendicularly at 0.5 m to turn nut of wheel of a bus. The torque acting on nut is
 A. 500 N m B. 50 N m C. 5 N m D. 0.005 N m

1. The shortest distance between two couple forces is
 A. moment arm B. couple arm C. radius D. double moment

1. A girl pushes to open a door perpendicularly with a force of 25 N at 0.6 m from the hinge, the torque is
 A. 41.6 N m B. 25.6 N m C. 15 N m D. 0 N m

1. The angle at which x and y components of force are equal is
 A. 0° B. 30° C. 45° D. 60°

1. CM is different from CG when we have non uniform
 A. shape of object B. mass of object C. gravitational force D. none of these