Modern Physics - Semiconductor Electronics

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Q1. The forward bias condition in a diode occurs when: (2020)

Solution:

In forward bias, the anode is connected to a higher potential than the cathode, allowing current to flow.

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Q2. Which device is used to convert AC to DC? (2023)

Solution:

A diode is used to convert alternating current (AC) to direct current (DC) by allowing current to flow in one direction.

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Q3. Which of the following is a characteristic of a diode? (2023)

Solution:

A diode allows current to flow in one direction only, making it a unidirectional device.

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Q4. What type of semiconductor is formed by adding trivalent impurities? (2023)

Solution:

Adding trivalent impurities (like boron) to a semiconductor creates a p-type semiconductor.

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Q5. Which of the following devices is based on the principle of a p-n junction? (2023)

Solution:

A Light Emitting Diode (LED) is based on the principle of a p-n junction, emitting light when current flows through it.

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Q6. What is the effect of temperature on the conductivity of semiconductors? (2019)

Solution:

As temperature increases, the conductivity of semiconductors increases due to the generation of more charge carriers.

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Q7. What type of charge carriers are predominant in n-type semiconductors? (2020)

Solution:

In n-type semiconductors, electrons are the predominant charge carriers.

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Q8. What happens to the resistance of a semiconductor as temperature increases? (2021)

Solution:

The resistance of a semiconductor decreases with an increase in temperature due to the increased number of charge carriers.

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Q9. What is the typical forward voltage drop across a silicon diode? (2023)

Solution:

The typical forward voltage drop across a silicon diode is approximately 0.7 V.

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Q10. Which of the following is a property of intrinsic semiconductors? (2023)

Solution:

Intrinsic semiconductors are in their pure form without any doping.