Multiple choice general knowledge science & technology The concept of zener diode being operated in reverse biased Avalanche Multiplication Zener Breakdown Both a and b Either a or b but not both Reveal answer Fill a bubble to check yourself D Correct answer Explanation Zener diodes can operate via two breakdown mechanisms: Zener breakdown (dominates below 5V) and avalanche multiplication (dominates above 5V). In the transition region (3-5V), both mechanisms occur simultaneously, not exclusively.