Modern Physics - Semiconductor Electronics

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Q1. 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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Q2. What type of semiconductor is formed when silicon is doped with arsenic? (2023)

Solution:

Doping silicon with arsenic, a pentavalent element, creates an n-type semiconductor due to the addition of extra electrons.

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Q3. What is the main function of a transistor? (2022)

Solution:

The main function of a transistor is to amplify electrical signals.

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Q4. What type of junction is formed when p-type and n-type semiconductors are joined? (2022)

Solution:

A p-n junction is formed when p-type and n-type semiconductors are joined together.

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Q5. What happens to the resistance of a semiconductor as it is illuminated? (2022)

Solution:

The resistance of a semiconductor decreases when it is illuminated due to the generation of electron-hole pairs.

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Q6. What is the effect of temperature on the conductivity of intrinsic semiconductors? (2021)

Solution:

As temperature increases, more electrons gain enough energy to jump the band gap, increasing conductivity.

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Q7. In a semiconductor, what happens to the conductivity as temperature increases? (2021)

Solution:

The conductivity of a semiconductor increases with temperature due to more charge carriers being available.

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Q8. What is the function of a diode in a circuit? (2020)

Solution:

A diode allows current to flow in one direction only, acting as a one-way valve for electric current.

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Q9. In a PN junction diode, what happens when it is forward biased? (2019)

Solution:

When a PN junction diode is forward biased, the depletion region narrows, allowing current to flow.

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Q10. Which type of semiconductor is formed by doping silicon with phosphorus? (2020)

Solution:

Doping silicon with phosphorus creates an n-type semiconductor due to the addition of extra electrons.