Theory of Machine
When a mass of a critically damped single degree of freedom system is deflected from its equilibrium position and released, then it will

Return to equilibrium position without oscillation
Oscillate with increasing time period
Oscillate with constant amplitude
Oscillate with decreasing amplitude

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Theory of Machine
Higher pairs are those which have

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

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Theory of Machine
In a mechanism, the fixed instantaneous centers are those centers which

Vary with the configuration of the mechanism
None of the listed here
Remain in the same place for all configurations of the mechanism
Moves as the mechanism moves, but joints are of permanent nature

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