Torque produces ………….

1 )   Torque produces  ………….

A ) Force ,                                                   b ) linear acceleration ,

C ) angular acceleration ,                            d ) None of these .

Correct answer : - C ) angular acceleration ,

Torque is a measure of the force and rotation of object about its axis and torque is also the vector quantity . Torque is a rotational analogue of the force . If a body is at rest or rotating with the uniform angular velocity , an angular acceleration will become zero . So the torque acting on a body will be zero .

Torque is also rate of change of momentum  : -

      L = m v r .           { L = angular momentum   ,  v = velocity covered by object ,

m = mass of object } ,

       L =  ∆p * r .        { ∆p = m v . } ,

       ∆L / ∆t = ( ∆p / ∆t ) * r .            { divide both sides by ∆t  } ,

      ∆L / ∆t =  F * r .             { ∆p / ∆t = F ( force) }  ,

     So ,

     ∆L / ∆t =  ῖ  .       {  ῖ   = torque }   ,

Therefore Torque of an object is also equals to the rate of change of momentum of that object .

2 )  Force produces ………..

A ) Both  ,                                         b ) angular acceleration ,

C ) linear  acceleration ,                                        d ) None of these .

Correct answer : - C ) linear  acceleration ,

3 )   Viscosity of ideal liquid is ………..  ,

A ) Zero ,                                          B ) Non Zero ,

C ) Can be zero or not ,                     D ) None of these ,

Correct Answer : - A ) Zero ,

4 )   Work-time graph represents …………. ,

A ) Energy ,                                                B ) Force ,

C ) Power ,                                       D ) None of these ,

Correct Answer : -  C ) Power ,

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