What is the key feature of a low-pass filter in network theory?

A. It allows low-frequency signals to pass while attenuating high-frequency signals
B. It allows high-frequency signals to pass while attenuating low-frequency signals
C. It blocks both low and high-frequency signals
D. It filters out noise from the system

Explanation:

A low-pass filter allows low-frequency signals to pass through while attenuating signals with higher frequencies, used for signal smoothing.

Tags: Network Theory MCQ, Electronics and Communication Engineering