Theory of Machine
When the two elements of a pair have __________ when in motion, it is said to a lower pair.

None of these
Body contact
Surface contact
Line or point contact

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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
Machines transmit mechanical work, whereas structures transmit forces
In machines, relative motion exists between its members, whereas same does not exist in case of structures

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