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WorksheetsCâu hỏi về Vật lý và Kỹ thuật
Total questions: 26
Worksheet time: 13mins
When a neutral atom loses an electron, it becomes:
positive ion, or Cation
negative ion, or Anion
Nucleus
Free electron
What is the bandgap in a semiconductor?
The energy gap where there are no electron states between the valence band and the conduction band
The energy level where free electrons can move to conduct electricity
The highest energy band that has been occupied in a semiconductor
The region where all electrons are tightly bound to the atoms
When two capacitors, C1 and C2, are connected in parallel, what is the equivalent capacitance of the combination?
The equivalent capacitance is the sum of the individual capacitances
The equivalent capacitance is the inverse of the sum of the inverses of the individual capacitances
The equivalent capacitance is the difference between the capacitances
The equivalent capacitance is the product of the capacitances
Which CMOS logic gate is the complement of the AND gate?
OR gate
NOR gate
NAND gate
XOR gate
What is the basic advantage of the complementary nature of NMOS and PMOS transistors in CMOS circuits?
Increased current
Low power consumption due to minimal current when inactive
Higher processing speed
Reduced voltage levels
If a negatively charged particle is released in a uniform electric field, in which direction will it move?
In the direction of the electric field
Opposite to the direction of the electric field
Perpendicular to the electric field
It will remain stationary
In the MOSFET fabrication process, photolithography is used to:
Create the gate oxide layer
Define the regions for source and drain
Deposit metal contacts
Dop impurities into the semiconductor
What is the bonding orbital of the two-electron wave functions?
Odd combination of individual atomic orbitals
Even or symmetric combination of individual atomic orbitals
Symmetric combination of individual atomic orbitals
Odd and symmetric combination of individual atomic orbitals
What is metallic bonding?
Valence electrons are shared with all atoms in a material
Valence electrons are shared between neighboring atoms
Valence electrons are transferred from one atom to another
Valence electrons are shared with all atoms in a material
When a neutral atom gains an electron, it becomes:
positive ion, or Cation
negative ion, or Anion
Nucleus
Free electron
Field Effect Transistor (FET) is a semiconductor device whose operation depends on:
Controlling current with a magnetic field
Controlling current with an electric field
Controlling current with a light source
Controlling current with a thermal field
Which material is commonly used for the gate electrode in MOSFETs?
Aluminum
Silicon dioxide (SiO₂)
Polysilicon
Copper
Which terminal of the FET is responsible for controlling the electric field that adjusts the current between the Drain (D) and Source (S)?
Source (S)
Drain (D)
Gate (G)
Base (B)
In the process of manufacturing MOSFETs, etching is used to:
Deposit thin layers of semiconductor material
Remove unwanted areas of gate oxide or polysilicon
Dop impurities into the source and drain regions
Create a channel by forming a conductive layer
What is the shape of the electric field around a straight current-carrying conductor?
Straight line
Circular
Elliptical
Parabolic
What does Gauss's law state?
The electric current through a closed surface is zero.
The net current through a closed surface is proportional to the total electric charge within the surface.
The electric field is always perpendicular to the surface of a conductor.
The current is inversely proportional to the square of the distance from the charge.
What primarily causes electric current in a conductor under the influence of an external electric field?
Neutrons
Protons
Electrons
Atoms
In an RL circuit, the current through the inductor at t = 0 is:
Maximum
Equal to the supplied current
Minimum
Zero
What is the physical mechanism of the drift of charged particles in a semiconductor?
Holes move in groups in the direction of the electric field and electrons move in groups in the opposite direction of the electric field.
Electrons move in groups in the direction of the electric field.
Holes move in groups in the opposite direction of the electric field.
Holes move in groups in the opposite direction of the electric field and electrons move in groups in the direction of the electric field.
A scientist measures the distance from Earth to the Moon using which unit?
Kilometer
Meter
Millimeter
Centimeter
What is the way a P-N junction in a photodetector responds to light?
It emits light due to the recombination of electrons and holes.
It enhances the current due to the generation of electron-hole pairs when exposed to light.
It completely blocks the current.
It causes a decrease in the conductivity of the material.
What is the result of applying a reverse voltage greater than the breakdown voltage to a P-N junction?
The junction conducts normally.
The junction is broken down, and the current increases sharply.
The current remains zero.
The junction completely stops conducting.
What is the typical value of the barrier potential for a silicon P-N junction at room temperature?
0.1 V
0.3 V
0.7 V
1.1 V
In a P-N junction, which of the following behaviors describes it when it is reverse biased?
The P material becomes more positive, and current flows.
The N material becomes more negative, and current flows.
The depletion region expands, and current is blocked.
The depletion region shrinks, allowing current to flow.
A BJT (Bipolar Junction Transistor) consists of how many doped semiconductor regions?
One
Two
Three
Four
In a Common Base (CB) configuration, the input signal is applied to the emitter, and the output signal is taken from the collector. What is the main characteristic of the CB configuration?
It provides high voltage gain but no current gain.
It provides high current gain but low voltage gain.
It provides high voltage gain and high current gain.
It provides low voltage gain and high current gain.
