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
Solution
When a p-n junction is forward biased, the depletion region narrows, allowing current to flow.
Correct Answer: B — Depletion region narrows
Learn More →
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
Solution
In the p-type region of a p-n junction, holes are the majority charge carriers.
Correct Answer: B — Holes
Learn More →
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
Solution
In a p-type region, holes are the predominant charge carriers.
Correct Answer: B — Holes
Learn More →
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
Solution
The depletion region in a PN junction diode is formed due to the recombination of electrons and holes at the junction.
Correct Answer: C — Recombination of electrons and holes
Learn More →
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
Solution
When a PN junction diode is forward biased, the depletion region narrows, allowing current to flow.
Correct Answer: B — Depletion region narrows
Learn More →
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
Solution
An electric field is formed at the junction of p-type and n-type materials due to the diffusion of charge carriers.
Correct Answer: A — Electric field
Learn More →
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
Solution
The depletion region is the area around the PN junction where no free charge carriers are present.
Correct Answer: A — Depletion region
Learn More →
Q. In a semiconductor, what happens to the conductivity as temperature increases? (2021)
-
A.
Decreases
-
B.
Increases
-
C.
Remains constant
-
D.
Becomes zero
Solution
The conductivity of a semiconductor increases with temperature due to more charge carriers being available.
Correct Answer: B — Increases
Learn More →
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
Solution
The reverse breakdown region in a Zener diode allows it to regulate voltage by maintaining a constant output voltage.
Correct Answer: B — To regulate voltage
Learn More →
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
Solution
In forward bias, the anode is connected to a higher potential than the cathode, allowing current to flow.
Correct Answer: A — Anode is at a higher potential than cathode
Learn More →
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
Solution
The resistance of a semiconductor decreases when it is illuminated due to the generation of electron-hole pairs.
Correct Answer: B — Decreases
Learn More →
Q. What happens to the resistance of a semiconductor as temperature increases? (2021)
-
A.
Increases
-
B.
Decreases
-
C.
Remains constant
-
D.
Becomes infinite
Solution
The resistance of a semiconductor decreases with an increase in temperature due to the increased number of charge carriers.
Correct Answer: B — Decreases
Learn More →
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
Solution
The resistance of a semiconductor decreases with an increase in temperature due to the increased number of charge carriers.
Correct Answer: B — Decreases
Learn More →
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
Solution
As temperature increases, more electrons gain enough energy to jump the band gap, increasing conductivity.
Correct Answer: C — Conductivity increases
Learn More →
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
Solution
As temperature increases, the conductivity of semiconductors increases due to the generation of more charge carriers.
Correct Answer: C — Conductivity increases
Learn More →
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
Solution
The energy band gap of a typical semiconductor like silicon is approximately 1.1 eV.
Correct Answer: B — 1.1 eV
Learn More →
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
Solution
A diode allows current to flow in one direction only, acting as a one-way valve for electric current.
Correct Answer: C — To allow current to flow in one direction
Learn More →
Q. What is the function of a transistor in a circuit? (2021)
-
A.
Amplification
-
B.
Rectification
-
C.
Capacitance
-
D.
Inductance
Solution
A transistor is primarily used for amplification of signals in electronic circuits.
Correct Answer: A — Amplification
Learn More →
Q. What is the main function of a transistor? (2022)
-
A.
Rectification
-
B.
Amplification
-
C.
Capacitance
-
D.
Inductance
Solution
The main function of a transistor is to amplify electrical signals.
Correct Answer: B — Amplification
Learn More →
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
Solution
A diode primarily functions to rectify current, allowing it to flow in one direction only.
Correct Answer: B — To rectify current
Learn More →
Q. What is the principle behind a photodiode? (2022)
-
A.
Thermal emission
-
B.
Photoelectric effect
-
C.
P-N junction
-
D.
Capacitance
Solution
A photodiode operates on the principle of the photoelectric effect, where light generates electron-hole pairs.
Correct Answer: B — Photoelectric effect
Learn More →
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
Solution
A capacitor is used in semiconductor circuits to store charge temporarily.
Correct Answer: A — To store charge
Learn More →
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
Solution
In a rectifier circuit, a diode allows current to flow in one direction, converting AC to DC.
Correct Answer: C — To allow current in one direction
Learn More →
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
Solution
Doping elements are added to semiconductors to change their conductivity by introducing additional charge carriers.
Correct Answer: C — To change the conductivity
Learn More →
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
Solution
A resistor is used to limit the current flowing through a semiconductor circuit to prevent damage.
Correct Answer: B — Limit current
Learn More →
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
Solution
Doping introduces additional charge carriers (electrons or holes) into the semiconductor, enhancing its conductivity.
Correct Answer: C — To introduce charge carriers
Learn More →
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
Solution
In reverse bias, a diode exhibits a very small reverse saturation current until breakdown occurs.
Correct Answer: D — Very small reverse saturation current
Learn More →
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
Solution
The typical forward voltage drop across a silicon diode is approximately 0.7 V.
Correct Answer: B — 0.7 V
Learn More →
Q. What type of charge carriers are predominant in n-type semiconductors? (2020)
-
A.
Holes
-
B.
Electrons
-
C.
Protons
-
D.
Neutrons
Solution
In n-type semiconductors, electrons are the predominant charge carriers.
Correct Answer: B — Electrons
Learn More →
Q. What type of charge carriers are present in n-type semiconductors? (2019)
-
A.
Holes
-
B.
Electrons
-
C.
Protons
-
D.
Neutrons
Solution
In n-type semiconductors, the majority charge carriers are electrons.
Correct Answer: B — Electrons
Learn More →
Showing 1 to 30 of 46 (2 Pages)