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RE-NEET2026Physics-Semiconductors

RE-NEET 2026 Physics Zener Diode MCQ Question

Type: MCQ-conceptual-Easy-Class 12

An ideal Zener diode with breakdown voltage of −3 V is reverse biased with a negative input voltage Vᵢ = −5 V. The magnitude of voltage difference between points B and A is:

Question diagram
A

2 V

B

1 V

C

0 V

D

3 V

Correct Answer

Option A

Detailed Explanation

In this scenario, the Zener diode has a breakdown voltage of −3 V. When reverse biased with an input voltage Vi=−5 VV_i = -5 \, V, the voltage across the diode is Vi−VZ=−5 V−(−3 V)=−2 VV_i - V_{Z} = -5 \, V - (-3 \, V) = -2 \, V.

The voltage difference between points B and A is the absolute value of this voltage across the Zener diode, which is ∣VBA∣=2 V|V_{BA}| = 2 \, V.

The other options fail because they either miscalculate the voltage drop across the diode or do not consider the correct reference points for measuring the voltage difference. Thus, the correct answer is A) 2 V.

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