Theory of Machine
The motion between a pair which takes place in ____ is known as incompletely constrained motion.

Two directions only
None of the listed here
One direction only
More than one direction

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Theory of Machine
A body is said to be under forced vibrations, when

A body vibrates under the influence of external force
None of these
There is a reduction in amplitude after every cycle of vibration
No external force acts on a body, after giving it an initial displacement

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