Zener Diode & Voltage Regulator MCQs
Zener Diode & Voltage Regulator MCQs
Class: CBSE Class 12 | Subject: Physics
Section 9: Electronic Devices
Topic: Zener Diode & Voltage Regulator
Based on CBSE Board Examination Pattern
Section 9: Electronic Devices
Topic: Zener Diode & Voltage Regulator
Based on CBSE Board Examination Pattern
Instructions: These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 12 Board Examination preparation.
1. Zener diode is specially designed to operate in:
Answer: B
Zener diode operates safely in reverse breakdown region without damage.
Zener diode operates safely in reverse breakdown region without damage.
2. Zener effect occurs due to:
Answer: B
Strong electric field causes electron tunneling across junction.
Strong electric field causes electron tunneling across junction.
3. Zener breakdown occurs at:
Answer: A
Zener diodes are designed for sharp breakdown at low reverse voltages.
Zener diodes are designed for sharp breakdown at low reverse voltages.
4. Zener voltage is:
Answer: B
Voltage at which breakdown occurs is called Zener voltage.
Voltage at which breakdown occurs is called Zener voltage.
5. Zener diode is used as:
Answer: B
Maintains constant output voltage despite input changes.
Maintains constant output voltage despite input changes.
6. Avalanche breakdown occurs due to:
Answer: A
High energy carriers create chain ionization.
High energy carriers create chain ionization.
7. Zener diode is heavily doped to:
Answer: B
Heavy doping narrows depletion region.
Heavy doping narrows depletion region.
8. In regulator circuit Zener is connected:
Answer: B
Connected across load.
Connected across load.
9. Series resistor in regulator:
Answer: B
Protects diode from excess current.
Protects diode from excess current.
10. Ideal regulator output is:
Answer: B
Maintains constant voltage.
Maintains constant voltage.
11. Zener diode symbol resembles:
Answer: B
Bent line indicates Zener property.
Bent line indicates Zener property.
12. Breakdown region current is:
Answer: B
Large reverse current flows.
Large reverse current flows.
13. Output voltage equals:
Answer: B
Clamped at Zener voltage.
Clamped at Zener voltage.
14. Zener regulator works when diode is:
Answer: B
Ensures voltage stability.
Ensures voltage stability.
15. If input rises, Zener current:
Answer: B
Maintains constant output.
Maintains constant output.
16. Zener diode material:
Answer: C
Fabricated from semiconductor materials.
Fabricated from semiconductor materials.
17. Voltage regulation means:
Answer: C
Main function of regulator circuits.
Main function of regulator circuits.
18. Zener diode acts like:
Answer: B
Maintains fixed voltage level.
Maintains fixed voltage level.
19. Power rating depends on:
Answer: C
Determines safe operating limit.
Determines safe operating limit.
20. Main advantage of Zener regulator:
Answer: D
Widely used due to simplicity & reliability.
Widely used due to simplicity & reliability.
