Quiz  /  Semiconductor Device Class 12 MCQ Questions With Answers

  • 1. 
    How is the P-type doping works?

  • Adding an element which has an extra electron
  • Adding an element which has a less electron
  • Adding an element which has an extra Neutron
  • Adding an element which has a less Neutron

  • 2. 
    How many electrons can be in the second shell?

  • 2
  • 4
  • 8
  • 18

  • 3. 
    How many electrons are typically in the valance shell of a semiconductor?

  • 2
  • 4
  • 8
  • 18

  • 4. 
    Hole is

  • an anti-particle of electron
  • a vacancy created when an electron leaves a covalent bond.
  • absence of free electrons.
  • an artifically created particle

  • 5. 
    How is the N-type doped semiconductor made?

  • Adding an element which has an extra electron
  • Adding an element which has a less electron
  • Adding an element which has an extra Neutron
  • Adding an element which has a less Neutron.

  • 6. 
    What material is used for p-type doping?

  • copper
  • Iron
  • Boron
  • Phosphorous

  • 7. 
    Copper, silver and gold are good

  • insulators
  • semiconductors
  • conductors
  • super insulators

  • 8. 
    A pn junction is formed by

  • the recombination of electrons and holes
  • ionization
  • the boudary of a p-type and an n-type material
  • the collision of a proton and a neutron

  • 9. 
    What are two types of doping?

  • P-type
  • N-type
  • M-type
  • Both A & B

  • 10. 
    Outer most shell of atom with highest energy level is known as

  • 1st shell
  • 2nd shell
  • valence shell
  • conduction shell

  • 11. 
    How many electrons can be in the first atomic shell?

  • 2
  • 8
  • 18
  • 36

  • 12. 
    Does pure silicon conduct electricity?

  • Always
  • Limited
  • Never

  • 13. 
    What does the diode do?

  • Making a uni directional current flow.
  • Making a bi directional current flow.

  • 14. 
    What we have inside of a charger?

  • Transformer
  • Diode
  • none of them
  • both of them

  • 15. 
    Find the voltage across the Silicon diode in the circuit shown:

  • 0 V
  • 0.2 V
  • 0.7 V
  • 5.3 V

  • 16. 
    For the circuit shown below, the output will be:

  • 2 negative peaks per full cycle of input
  • 2 Positive peaks per full cycle of input
  • Negative peaks for negative half cycles of input
  • Positive peaks for positive half cycles of input
  • Zero volts

  • 17. 
    Diagram 12 shows the arrangement of silicon atoms after an atom X is doped to form an extrinsic semiconductor. Which of the following is true?

  • The conductivity of the semiconductor decreases.
  • The semiconductor becomes a p-type.
  • The majority charge carrier is electron.
  • Atom X is a trivalent atom

  • 18. 
    Let np and ne be the number density of holes and conduction electrons respectively in a semiconductor. Then,

  • np > ne in an intrinsic semiconductor, I < Ip + Ie
  • np = ne in an extrinsic semiconductor, I > Ip + Ie
  • np = ne in an intrinsic semiconductor, I = Ip + Ie
  • np > ne in an intrinsic semiconductor, I = 0( Here, Ip = current due to holes,Ie= current due to electrons, I= total current)

  • 19. 
    Which of the following circuits shows the forward-biased arrangement of a diode?

  • A
  • B
  • C
  • D

  • 20. 
    Diagram 11 shows a circuit with a bulb that does not light up. Which of the following actions will make the bulb light up?

  • Connecting a fuse to the circuit
  • Reversing the battery connection
  • Changing the power supply to a 3V battery
  • Reversing the bulb connection

  • 21. 
    Which of the following circuits will light up the bulb?

  • A
  • B
  • C
  • D

  • 22. 
    Which of the following statements is NOT the diode application in electronic circuit?

  • Diode as voltage regulator
  • Diode as Rectifier
  • Diode as Amplifier
  • Diode as solar cell

  • 23. 
    Diagram 13 shows five identical bulbs P, Q, R, S and T in a circuit. Which bulbs light up continuously when the switch is on?

  • P, Q and T only
  • Q and S only
  • R and S only
  • P and R only

  • 24. 
    Is the element added to the type p semiconductors.

  • Antimony
  • Boron
  • Chlorine
  • Argon

  • 25. 
    The characteristics of p-type semiconductors is includes

  • Majority carriers are electron
  • Has tendency to gain electron
  • Has tendency to donor electron
  • Easy to conduct electricity

  • 26. 
    Conductivity of semiconductor increases with increase in temperature, because

  • number density of free charge carriers increases
  • relaxation time increases
  • both number density of free charge carriers and relaxation time increases
  • number density of free charge carriers increases relaxation time decreases but effect of decrease in relaxation time is much less than increase in number density
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