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

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

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Theory of Machine
Which of the following is false statement in respect of differences between machine and structure?

Machines modify movement and work, whereas structures modify forces
In machines, relative motion exists between its members, whereas same does not exist in case of structures
Machines transmit mechanical work, whereas structures transmit forces
Efficiency of machines as well as structures is below 100 %

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