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Latest KSET Electronic Science Exam Question (Objective Questions), MCQ in English

Subjects : Electronic Science

Question Bank KSET Electronic Science (Paper 2) Exam - English
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Electronic Science

Question 1Single Answer
Energy bands in solids are formed due to?
  1. A
    Nuclear interaction
  2. B
    Gravitational force
  3. C
    Overlap of atomic orbitals in periodic lattice
  4. D
    Magnetic field only
Question 2Single Answer
The concept of effective mass is used to describe?
  1. A
    Proton motion
  2. B
    Electron motion in crystal lattice
  3. C
    Electron motion in vacuum
  4. D
    Neutron decay
Question 3Single Answer
Fermi level at absolute zero temperature lies?
  1. A
    In conduction band
  2. B
    At highest occupied energy level
  3. C
    In valence band
  4. D
    In forbidden band always
Question 4Single Answer
In an intrinsic semiconductor, the Fermi level is located?
  1. A
    Near conduction band
  2. B
    At mid-gap
  3. C
    Near valence band
  4. D
    Outside band gap
Question 5Single Answer
PN junction is formed by joining?
  1. A
    P-type and N-type semiconductors
  2. B
    Two metals
  3. C
    Two insulators
  4. D
    Metal and vacuum
Question 6Single Answer
The depletion region in a PN junction contains?
  1. A
    Free electrons only
  2. B
    Free holes only
  3. C
    Neutral atoms only
  4. D
    Fixed ions only
Question 7Single Answer
Diode current equation is also called?
  1. A
    Ohm’s law equation
  2. B
    Shockley equation
  3. C
    Newton’s equation
  4. D
    Planck equation
Question 8Single Answer
Reverse breakdown in a diode occurs due to?
  1. A
    Low voltage
  2. B
    High reverse voltage
  3. C
    Low temperature
  4. D
    Forward bias
Question 9Single Answer
Zener diode is mainly used for?
  1. A
    Voltage regulation
  2. B
    Oscillation
  3. C
    Amplification
  4. D
    Rectification only
Question 10Single Answer
Tunnel diode works on the principle of?
  1. A
    Thermal emission
  2. B
    Diffusion
  3. C
    Quantum tunneling
  4. D
    Induction
Question 11Single Answer
Ohmic contact is characterized by?
  1. A
    Non-linear I-V curve
  2. B
    Linear I-V curve
  3. C
    Rectifying behavior
  4. D
    Negative resistance
Question 12Single Answer
Schottky contact is formed between?
  1. A
    Metal and semiconductor
  2. B
    Two semiconductors
  3. C
    Two metals
  4. D
    Two insulators
Question 13Single Answer
JFET is a device controlled by?
  1. A
    Current at gate
  2. B
    Temperature
  3. C
    Light
  4. D
    Voltage at gate
Question 14Single Answer
MOSFET gate is insulated by?
  1. A
    Silicon dioxide
  2. B
    Copper layer
  3. C
    Aluminum foil
  4. D
    Vacuum
Question 15Single Answer
In enhancement MOSFET, channel exists?
  1. A
    Always
  2. B
    Only when voltage is applied
  3. C
    Never
  4. D
    Only in reverse bias
Question 16Single Answer
Depletion region width increases in PN junction when?
  1. A
    Reverse biased
  2. B
    Forward biased
  3. C
    No bias
  4. D
    High temperature only
Question 17Single Answer
Band gap of a semiconductor is typically?
  1. A
    > 10 eV
  2. B
    0 eV
  3. C
    Infinite
  4. D
    0.1–3 eV
Question 18Single Answer
Intrinsic carrier concentration increases with?
  1. A
    Decreasing temperature
  2. B
    Magnetic field
  3. C
    Constant pressure
  4. D
    Increasing temperature
Question 19Single Answer
Effective mass of electron depends on?
  1. A
    Vacuum permittivity
  2. B
    Light speed
  3. C
    Gravity
  4. D
    Crystal lattice structure
Question 20Single Answer
In PN junction forward bias, barrier potential?
  1. A
    Increases
  2. B
    Decreases
  3. C
    Becomes infinite
  4. D
    Remains constant
Question 21Single Answer
LED works on the principle of?
  1. A
    Thermal emission
  2. B
    Induction
  3. C
    Electroluminescence
  4. D
    Reflection
Question 22Single Answer
LCD operates based on?
  1. A
    Liquid crystal alignment with electric field
  2. B
    Electron emission
  3. C
    Nuclear reaction
  4. D
    Magnetic flux
Question 23Single Answer
Solar cell converts?
  1. A
    Heat to electricity
  2. B
    Chemical to mechanical
  3. C
    Sound to electricity
  4. D
    Light to electrical energy
Question 24Single Answer
Fill factor of solar cell is defined as?
  1. A
    Ratio of max power to (Voc × Is
  2. B
    Ratio of current to voltage
Question 25Single Answer
Graphene is a form of?
  1. A
    Carbon
  2. B
    Silicon
  3. C
    Germanium
  4. D
    Gallium
Question 26Single Answer
Carbon nanotubes are rolled structure of?
  1. A
    Metal sheet
  2. B
    Silicon sheet
  3. C
    Graphene sheet
  4. D
    Oxide layer
Question 27Single Answer
ZnO is widely used in?
  1. A
    Optoelectronic devices
  2. B
    RF shielding only
  3. C
    Mechanical gears
  4. D
    Fuel cells only
Question 28Single Answer
SiC is preferred for high power devices due to?
  1. A
    Low band gap
  2. B
    High resistance only
  3. C
    Low stability
  4. D
    High thermal conductivity and wide band gap
Question 29Single Answer
Density of states represents?
  1. A
    Number of atoms
  2. B
    Number of available energy states per unit energy
  3. C
    Charge density
  4. D
    Mass density
Question 30Single Answer
In metals, Fermi level lies in?
  1. A
    Valence band
  2. B
    Vacuum level
  3. C
    Forbidden band
  4. D
    Conduction band
Question 31Single Answer
PN junction under equilibrium has?
  1. A
    Net current flow
  2. B
    No net current flow
  3. C
    Maximum current
  4. D
    Infinite resistance
Question 32Single Answer
Reverse saturation current in diode is due to?
  1. A
    Majority carriers
  2. B
    Phonons
  3. C
    Ions
  4. D
    Minority carriers
Question 33Single Answer
Zener breakdown occurs due to?
  1. A
    Strong electric field causing tunneling
  2. B
    Avalanche multiplication only
  3. C
    Thermal heating only
  4. D
    Mechanical stress
Question 34Single Answer
Avalanche breakdown is caused by?
  1. A
    Recombination only
  2. B
    Quantum tunneling
  3. C
    Diffusion
  4. D
    Impact ionization
Question 35Single Answer
MOSFET is a?
  1. A
    Current controlled device
  2. B
    Thermal device
  3. C
    Optical device
  4. D
    Voltage controlled device
Question 36Single Answer
JFET channel is controlled by?
  1. A
    Drain voltage
  2. B
    Gate voltage
  3. C
    Source resistance
  4. D
    Body temperature
Question 37Single Answer
In depletion MOSFET, channel exists at zero gate voltage?
  1. A
    Yes
  2. B
    No
  3. C
    Only at high temperature
  4. D
    Only under light
Question 38Single Answer
Metal semiconductor contact behaves as Schottky when?
  1. A
    Ohmic contact forms
  2. B
    Infinite resistance
  3. C
    No current flows
  4. D
    Rectifying barrier forms
Question 39Single Answer
Quantum dots are also called?
  1. A
    3D bulk
  2. B
    1D structures
  3. C
    2D structures
  4. D
    0D structures
Question 40Single Answer
Quantum wires are?
  1. A
    0D systems
  2. B
    1D systems
  3. C
    2D systems
  4. D
    3D systems
Question 41Single Answer
Quantum wells are?
  1. A
    0D
  2. B
    1D
  3. C
    3D
  4. D
    2D
Question 42Single Answer
Band gap in semiconductors decreases with temperature because of?
  1. A
    Decreased carrier density
  2. B
    Increased collisions
  3. C
    Lattice expansion
  4. D
    Magnetic effects
Question 43Single Answer
Fermi-Dirac distribution gives?
  1. A
    Current density
  2. B
    Charge density
  3. C
    Energy loss
  4. D
    Probability of electron occupancy
Question 44Single Answer
At room temperature intrinsic semiconductor behaves like?
  1. A
    Perfect conductor
  2. B
    Poor conductor
  3. C
    Insulator
  4. D
    Superconductor
Question 45Single Answer
In PN junction, diffusion current is due to?
  1. A
    Electric field
  2. B
    Radiation
  3. C
    Magnetic field
  4. D
    Concentration gradient
Question 46Single Answer
Drift current is caused by?
  1. A
    Temperature gradient
  2. B
    Light
  3. C
    Pressure
  4. D
    Electric field
Question 47Single Answer
Metal semiconductor junction is used in?
  1. A
    Inductors
  2. B
    Capacitors only
  3. C
    Rectifiers and contacts
  4. D
    Batteries
Question 48Single Answer
LED emission wavelength depends on?
  1. A
    Band gap energy
  2. B
    Current only
  3. C
    Resistance
  4. D
    Magnetic field
Question 49Single Answer
Solar cell efficiency depends on?
  1. A
    Fill factor and band gap
  2. B
    Only resistance
  3. C
    Only temperature
  4. D
    Only light intensity
Question 50Single Answer
HEMT stands for?
  1. A
    High Energy Magnetic Transistor
  2. B
    High Electron Mobility Transistor
  3. C
    Heat Emission MOSFET Type
  4. D
    Hybrid Electron Movement Tool
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