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 ,
