Semiconductors
Q. What is the role of a semiconductor in a transistor?
-
A.
To store charge
-
B.
To amplify current
-
C.
To insulate
-
D.
To generate heat
Solution
In a transistor, the semiconductor material is used to amplify current, allowing small input signals to control larger output signals.
Correct Answer: B — To amplify current
Learn More →
Q. What is the role of a transistor in electronic circuits?
-
A.
Switching
-
B.
Amplification
-
C.
Signal modulation
-
D.
All of the above
Solution
Transistors can perform multiple functions including switching, amplification, and signal modulation.
Correct Answer: D — All of the above
Learn More →
Q. What is the role of temperature in the behavior of semiconductors?
-
A.
It has no effect
-
B.
It decreases conductivity
-
C.
It increases the number of charge carriers
-
D.
It only affects p-type semiconductors
Solution
Temperature increases the number of charge carriers in semiconductors, thus increasing their conductivity.
Correct Answer: C — It increases the number of charge carriers
Learn More →
Q. What is the typical band gap of germanium?
-
A.
0.66 eV
-
B.
1.1 eV
-
C.
1.5 eV
-
D.
2.0 eV
Solution
The typical band gap of germanium is approximately 0.66 eV.
Correct Answer: A — 0.66 eV
Learn More →
Q. What is the typical range of energy band gaps for semiconductors?
-
A.
0.1 - 0.5 eV
-
B.
0.5 - 1.5 eV
-
C.
1.5 - 3.0 eV
-
D.
3.0 - 5.0 eV
Solution
The typical range of energy band gaps for semiconductors is between 0.5 eV and 1.5 eV.
Correct Answer: B — 0.5 - 1.5 eV
Learn More →
Q. What is the typical range of the energy band gap for semiconductors?
-
A.
0.1 - 0.5 eV
-
B.
0.5 - 2.5 eV
-
C.
2.5 - 5 eV
-
D.
5 - 10 eV
Solution
The typical range of the energy band gap for semiconductors is between 0.5 eV and 2.5 eV.
Correct Answer: B — 0.5 - 2.5 eV
Learn More →
Q. What type of semiconductor behavior is exhibited by a material with a very small band gap?
-
A.
Insulator
-
B.
Conductor
-
C.
Superconductor
-
D.
Semiconductor
Solution
A material with a very small band gap behaves like a semiconductor, allowing some charge carriers to be thermally excited.
Correct Answer: D — Semiconductor
Learn More →
Q. What type of semiconductor is formed when silicon is doped with phosphorus?
-
A.
p-type
-
B.
n-type
-
C.
Intrinsic
-
D.
Superconductor
Solution
Doping silicon with phosphorus creates an n-type semiconductor due to the extra electrons contributed by phosphorus.
Correct Answer: B — n-type
Learn More →
Q. Which device utilizes the p-n junction principle?
-
A.
Resistor
-
B.
Capacitor
-
C.
Diode
-
D.
Inductor
Solution
A diode is a semiconductor device that utilizes the p-n junction principle to allow current to flow in one direction.
Correct Answer: C — Diode
Learn More →
Q. Which of the following describes the behavior of a Zener diode?
-
A.
Acts as a regular diode
-
B.
Allows current to flow in both directions
-
C.
Maintains a constant voltage
-
D.
Has no breakdown voltage
Solution
A Zener diode is designed to maintain a constant voltage across it when reverse-biased, allowing it to regulate voltage.
Correct Answer: C — Maintains a constant voltage
Learn More →
Q. Which of the following devices is based on the principle of semiconductors?
-
A.
Transformer
-
B.
Capacitor
-
C.
Transistor
-
D.
Inductor
Solution
A transistor is a semiconductor device that can amplify or switch electronic signals and electrical power.
Correct Answer: C — Transistor
Learn More →
Q. Which of the following is a characteristic of intrinsic semiconductors?
-
A.
High conductivity
-
B.
Temperature-dependent conductivity
-
C.
Presence of impurities
-
D.
Permanent charge carriers
Solution
Intrinsic semiconductors have conductivity that is highly dependent on temperature, as they have no impurities.
Correct Answer: B — Temperature-dependent conductivity
Learn More →
Q. Which of the following materials is commonly used as a p-type semiconductor?
-
A.
Silicon
-
B.
Germanium
-
C.
Gallium Arsenide
-
D.
Boron-doped Silicon
Solution
Boron-doped Silicon is a common p-type semiconductor as boron creates holes in the silicon lattice.
Correct Answer: D — Boron-doped Silicon
Learn More →
Q. Which of the following materials is commonly used as a semiconductor?
-
A.
Copper
-
B.
Silicon
-
C.
Aluminum
-
D.
Iron
Solution
Silicon is widely used as a semiconductor material due to its suitable band gap and availability.
Correct Answer: B — Silicon
Learn More →
Q. Which type of semiconductor has an excess of electrons?
-
A.
P-type
-
B.
N-type
-
C.
Intrinsic
-
D.
Extrinsic
Solution
N-type semiconductors have an excess of electrons due to the addition of donor impurities.
Correct Answer: B — N-type
Learn More →
Showing 31 to 45 of 45 (2 Pages)