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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