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

Surface contact
Line or point contact
None of these
Body contact

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

In machines, relative motion exists between its members, whereas same does not exist in case of structures
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 %

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