Process Control and Instrumentation
A sinusoidal variation in the input passing through a linear first order system

Becomes more oscillatory (frequency increases)
Gets attenuated (magnitude decreases)
Becomes less oscillatory (frequency decreases)
Gets amplified (magnitude increases)

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Process Control and Instrumentation
In a second order under damped system, the

None of these
Time required for the response of first reach its ultimate value is called the response time
Decay ratio (which is the ratio of the sizes of successive peaks) is equal to the reciprocal of overshoot
Overshoot (which is a measure of how much the response exceeds the ultimate value) increase with the decrease of damping co-efficient e

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