Modern Physics - Semiconductor Electronics

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Q. In a p-n junction, what happens when the junction is forward biased? (2019)
  • A. Depletion region widens
  • B. Depletion region narrows
  • C. No current flows
  • D. Reverse current increases
Q. In a p-n junction, which type of charge carriers are majority carriers in the p-type region? (2019)
  • A. Electrons
  • B. Holes
  • C. Protons
  • D. Neutrons
Q. In a p-n junction, which type of charge carriers are predominant in the p-type region? (2019)
  • A. Electrons
  • B. Holes
  • C. Protons
  • D. Neutrons
Q. In a PN junction diode, the depletion region is formed due to: (2019)
  • A. Excess electrons
  • B. Excess holes
  • C. Recombination of electrons and holes
  • D. External voltage
Q. In a PN junction diode, what happens when it is forward biased? (2019)
  • A. Depletion region widens
  • B. Depletion region narrows
  • C. No current flows
  • D. Reverse current increases
Q. In a PN junction, what is formed at the junction of p-type and n-type materials? (2021)
  • A. Electric field
  • B. Magnetic field
  • C. Thermal field
  • D. Gravitational field
Q. In a PN junction, what is the region called where no charge carriers are present? (2019)
  • A. Depletion region
  • B. Conduction band
  • C. Valence band
  • D. Neutral zone
Q. In a semiconductor, what happens to the conductivity as temperature increases? (2021)
  • A. Decreases
  • B. Increases
  • C. Remains constant
  • D. Becomes zero
Q. In a Zener diode, what is the purpose of the reverse breakdown region? (2020)
  • A. To increase voltage
  • B. To regulate voltage
  • C. To decrease current
  • D. To store energy
Q. The forward bias condition in a diode occurs when: (2020)
  • A. Anode is at a higher potential than cathode
  • B. Cathode is at a higher potential than anode
  • C. Both terminals are at the same potential
  • D. None of the above
Q. What happens to the resistance of a semiconductor as it is illuminated? (2022)
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Becomes infinite
Q. What happens to the resistance of a semiconductor as temperature increases? (2021)
  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Becomes infinite
Q. What happens to the resistance of a semiconductor with an increase in temperature? (2023)
  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Becomes infinite
Q. What is the effect of temperature on the conductivity of intrinsic semiconductors? (2021)
  • A. Conductivity decreases
  • B. Conductivity remains constant
  • C. Conductivity increases
  • D. Conductivity becomes zero
Q. What is the effect of temperature on the conductivity of semiconductors? (2019)
  • A. Conductivity decreases
  • B. Conductivity remains constant
  • C. Conductivity increases
  • D. Conductivity becomes zero
Q. What is the energy band gap of a typical semiconductor? (2021)
  • A. 0.1 eV
  • B. 1.1 eV
  • C. 2.0 eV
  • D. 3.5 eV
Q. What is the function of a diode in a circuit? (2020)
  • A. To store energy
  • B. To amplify signals
  • C. To allow current to flow in one direction
  • D. To resist current flow
Q. What is the function of a transistor in a circuit? (2021)
  • A. Amplification
  • B. Rectification
  • C. Capacitance
  • D. Inductance
Q. What is the main function of a transistor? (2022)
  • A. Rectification
  • B. Amplification
  • C. Capacitance
  • D. Inductance
Q. What is the primary function of a diode? (2022)
  • A. To amplify current
  • B. To rectify current
  • C. To store charge
  • D. To generate voltage
Q. What is the principle behind a photodiode? (2022)
  • A. Thermal emission
  • B. Photoelectric effect
  • C. P-N junction
  • D. Capacitance
Q. What is the role of a capacitor in a semiconductor circuit? (2019)
  • A. To store charge
  • B. To amplify signals
  • C. To rectify current
  • D. To generate heat
Q. What is the role of a diode in a rectifier circuit? (2022)
  • A. To amplify signals
  • B. To store charge
  • C. To allow current in one direction
  • D. To increase voltage
Q. What is the role of a doping element in a semiconductor? (2020)
  • A. To increase resistance
  • B. To decrease temperature
  • C. To change the conductivity
  • D. To create a magnetic field
Q. What is the role of a resistor in a semiconductor circuit? (2023)
  • A. Increase current
  • B. Limit current
  • C. Store charge
  • D. Amplify signal
Q. What is the role of doping in semiconductors? (2022)
  • A. To increase resistance
  • B. To decrease conductivity
  • C. To introduce charge carriers
  • D. To create a magnetic field
Q. What is the typical current-voltage characteristic of a diode in reverse bias? (2019)
  • A. Linear
  • B. Exponential
  • C. Constant
  • D. Very small reverse saturation current
Q. What is the typical forward voltage drop across a silicon diode? (2023)
  • A. 0.2 V
  • B. 0.7 V
  • C. 1.5 V
  • D. 2.0 V
Q. What type of charge carriers are predominant in n-type semiconductors? (2020)
  • A. Holes
  • B. Electrons
  • C. Protons
  • D. Neutrons
Q. What type of charge carriers are present in n-type semiconductors? (2019)
  • A. Holes
  • B. Electrons
  • C. Protons
  • D. Neutrons
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