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

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

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Theory of Machine
Higher pairs are those which have

Two elements that permit relative motion
Elements of pairs not held together mechanically
Surface contact between the two elements when in motion
Point or line contact between the two elements when in motion

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