Theory of Machine
In a mechanism, usually one link is fixed. If the fixed link is changed in a kinematic chain, then relative motion of other links

Could change or remain unaltered depending on which link is fixed
Will remain same
Will not occur
Will change

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Theory of Machine
A rigid body, under the action of external forces, can be replaced by two masses placed at a fixed distance apart. The two masses form an equivalent dynamical system, if

All of these
The sum of the two masses is equal to the total mass of body
The center of gravity of the two masses coincides with that of the body
The sum of mass moment of inertia of the masses about their center of gravity is equal to the mass moment of inertia of the body

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