Theory of Machine
When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a

Lower pair
Force-closed pair
Self-closed pair
Higher pair

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

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