Theory of Machine
The instantaneous center of a rigid thin disc rolling on a plane rigid surface is located at

An infinite distance on the plane surface
The point on the circumference situated vertically opposite to the contact point
The point of contact
The center of the disc

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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
There is a reduction in amplitude after every cycle of vibration
A body vibrates under the influence of external force
None of these

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