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

Efficiency of machines as well as structures is below 100 %
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

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Theory of Machine
The inversion of a mechanism is

Obtained by fixing different links in a kinematic chain
Obtained by reversing the input and output motion
Turning its upside down
Changing of a higher pair to a lower pair

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