Welcome to Semiconductor Diode NEET MCQ, In this collection of multiple-choice questions (MCQs), each question is accompanied by both the correct answer and a detailed explanation. These MCQs are designed for NEET (National Eligibility-cum-Entrance Test) exam preparation, these MCQs will not only test your knowledge of semiconductor diodes but also provide you with comprehensive insights to deepen your understanding.
1. A semiconductor diode is formed by joining:
Answer:
Explanation:
A semiconductor diode is essentially a p-n junction formed by joining a p-type and an n-type semiconductor.
2. In forward bias condition of a p-n diode:
Answer:
Explanation:
In the forward bias, the p-side is connected to the positive terminal and the n-side to the negative terminal of the battery.
3. Which of the following about a diode is true?
Answer:
Explanation:
A diode typically allows current to flow only in one direction, from the p-side to the n-side.
4. The depletion region in a diode is formed due to:
Answer:
Explanation:
The depletion region is formed due to the recombination of electrons from the n-side with holes from the p-side.
5. In reverse bias condition of a diode:
Answer:
Explanation:
In the reverse bias condition, the majority carriers are pulled away from the junction, leaving the minority carriers to conduct a small current.
6. The ideal voltage across a silicon diode in forward bias for it to conduct is:
Answer:
Explanation:
For a silicon diode, the threshold or cut-in voltage is approximately 0.7 V.
7. Zener diode is specially designed for:
Answer:
Explanation:
Zener diodes are designed to operate in the reverse breakdown region.
8. Light Emitting Diodes (LED) emit light when:
Answer:
Explanation:
LEDs emit light when electrons recombine with holes, releasing energy in the form of photons.
9. The material used for making solar cells is:
Answer:
Explanation:
Silicon diodes are commonly used in the construction of solar cells.
10. A diode's dynamic resistance is calculated in:
Answer:
Explanation:
Dynamic resistance of a diode is calculated during its forward bias condition.
11. The barrier potential for germanium diode is approximately:
Answer:
Explanation:
For a germanium diode, the barrier potential is approximately 0.3 V.
12. A photodiode is operated in:
Answer:
Explanation:
Photodiodes are designed to operate in reverse bias.
13. The diode which can operate in reverse breakdown region without getting damaged is:
Answer:
Explanation:
Zener diodes are specially designed to operate safely in the reverse breakdown region.
14. In a common diode, as the temperature rises:
Answer:
Explanation:
With increasing temperature, the barrier potential of a diode decreases.
15. Avalanche breakdown in a diode is due to:
Answer:
Explanation:
Avalanche breakdown occurs due to impact ionization, where high kinetic energy carriers collide with bound electrons, releasing more carriers.