Theory of Machine
The pair is known as a higher pair, when the relative motion between the elements of a pair is

Sliding only
Partly turning and partly sliding
Rolling only
Turning only

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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

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

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