Basic Qualification · B-005 Basic electronics and theory · B-005-010-008
What property allows a bypass capacitor in an audio circuit to divert an interfering RF signal?
- A High reactance at audio frequencies
- B Low reactance at radio frequencies
- C High reactance at radio frequencies
- D Low reactance at audio frequencies
Correct answer: B — Low reactance at radio frequencies. From the official ISED question bank, verified word for word.
Why
A bypass capacitor works by offering an easy path for unwanted radio signals to flow to ground instead of through your audio equipment. The full explanation — and one for every question — is in Pro.
Practise this section
The theory: Ohm's law, power, series and parallel circuits, AC and DC, frequency and wavelength, decibels, and the metric prefixes the exam leans on.