General exam question G7C07

WhyInsertion loss is the term for a filter's attenuation inside its passband. The small amount of signal loss a filter introduces to frequencies inside its own passband, where it's supposed to pass the signal through cleanly, is called insertion loss, answer A. Return loss describes impedance mismatch reflections, Q describes a resonant circuit's sharpness, and ultimate rejection describes how well the filter blocks signals far outside its passband, none of which is the passband attenuation figure being asked about.