Explanation:
When a system is subjected to positive feedback, it tends to oscillate. The reason behind this is that positive feedback amplifies the output signal, which in turn is fed back to the input causing further amplification, and so on. This results in an uncontrollable increase in the output signal, leading to oscillations.

Positive feedback loop:
A positive feedback loop is a self-reinforcing cycle in which an output signal feeds back to the input, leading to amplification of the output signal. In other words, the output signal reinforces the input signal, causing it to increase further. This type of feedback is common in electronic circuits, where it can cause oscillations in the output signal.

Oscillations:
Oscillations refer to the repetitive variation of a quantity about a mean value. In the case of positive feedback, oscillations occur because the output signal keeps increasing in amplitude until it reaches a maximum value. At this point, the system reaches a state of instability, and the output signal starts decreasing. However, as the output signal decreases, the positive feedback loop causes it to increase again, leading to another cycle of oscillations.

Examples:
Positive feedback can be found in a variety of systems, including electronic circuits, biological systems, and social systems. In electronic circuits, positive feedback can cause oscillations in amplifiers, oscillators, and filters. In biological systems, positive feedback can be seen in the regulation of hormone levels and the control of the menstrual cycle. In social systems, positive feedback can lead to the spread of rumors and the formation of fads and trends.

Conclusion:
In conclusion, oscillations in the output response are due to positive feedback. Positive feedback loops amplify the output signal, leading to uncontrollable increases in amplitude and the onset of oscillations. Understanding the effects of positive feedback is important in the design and analysis of electronic circuits, biological systems, and social systems.