Basic Electronics MCQ

#1 Basic Electronics MCQ

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20 Basic electronics MCQ’s

Question 1 The most commonly used semiconductor is ………

  • Germanium
  • Silicon
  • Carbon
  • Sulphur

Answer – Silicon

Question 2 The resistivity of a pure silicon is about ……………

  • 100 Ω cm
  • 6000 Ω cm
  • 3 x 105 Ω m
  • 6 x 10-8 Ω cm

Answer – 6000 Ω cm

Question 3 A semiconductor is formed by ……… bonds.

  • Covalent
  • Electrovalent
  • Co-ordinate
  • None of the above

Answer – Covalent

Question 4 A pentavalent impurity has ………. Valence electrons

  • 3
  • 5
  • 4
  • 6

Answer – 5

Question 5 A semiconductor has generally ……………… valence electrons.

  • 2
  • 3
  • 6
  • 4

Answer – 4

Question 6 A hole in a semiconductor is defined as …………….

  • A free electron
  • The incomplete part of an electron pair bond
  • A free proton
  • A free neutron

Answer – The incomplete part of an electron pair bond

Question 7 Addition of trivalent impurity to a semiconductor creates many ……..

  • Holes
  • Free electrons
  • Valence electrons
  • Bound electrons

Answer – Holes

Question 8 Addition of pentavalent impurity to a semiconductor creates many ……..

  • Free electrons
  • Holes
  • Valence electrons
  • Bound electrons

Answer – Free electrons

Question 9 In a semiconductor, current conduction is due to …

  • Only holes
  • Only free electrons
  • Holes and free electrons
  • None of the above

Answer – Holes and free electrons

Question 10 The battery connections required to forward bias a pn junction are ……

  • +ve terminal to p and –ve terminal to n
  • -ve terminal to p and +ve terminal to n
  • -ve terminal to p and –ve terminal to n
  • None of the above

Answer – +ve terminal to p and –ve terminal to n

Question 11 A forward biased pn junction diode has a resistance of the order of

  • Ω
  • None of the above

Answer – Ω

Question 12 The barrier voltage at a pn junction for germanium is about ………

  • 5 V
  • 3 V
  • Zero
  • 0.3 V

Answer – 0.3 V

Question 13 A reverse bias pn junction has …………

  • Very narrow depletion layer
  • Almost no current
  • Very low resistance
  • Large current flow

Answer – Almost no current

Question 14 A pn junction acts as a ……….

  • Controlled switch
  • Bidirectional switch
  • Unidirectional switch
  • None of the above

Answer – Unidirectional switch

Question 15 In the depletion region of a pn junction, there is a shortage of ……..

  • Acceptor ions
  • Holes and electrons
  • Donor ions
  • None of the above

Answer – Holes and electrons

Question 16 The leakage current across a pn junction is due to …

  • Minority carriers
  • Majority carriers
  • Junction capacitance
  • None of the above

Answer – Minority carriers

Question 17 When the temperature of an extrinsic semiconductor is increased, the pronounced effect is on……

  • Junction capacitance
  • Minority carriers
  • Majority carriers
  • None of the above

Answer – Minority carriers

Question 18 With forward bias to a pn junction , the width of depletion layer ………

  • Decreases
  • Increases
  • Remains the same
  • None of the above

Answer – Decreases

Question 19 At room temperature, an intrinsic semiconductor has ……….

  • Many holes only
  • A few free electrons and holes
  • Many free electrons only
  • No holes or free electron

Answer – A few free electrons and holes

Question 20 The leakage current in a pn junction is of the order of

  • Aa
  • mA
  • kA
  • µA

Answer – µA


Topics


FAQ – Frequently ask questions

Which is most commonly used semiconductor?

Silicon, Silicon is the most used semiconductor in power electronic components like diodes, thyristors, IGBT, MOSFET transistors.

How Semiconductor form?

A semiconductor is form by covalent bond with his neighboring atoms.
In covalent bonding each valence electron is shared by two atoms

How many valence electrons in a pentavalent impurity atom?

In pentavalent impurity atom 5 valence electron in their outer most cell

How pn junction acts?

pn junction acts as a unidirectional switch

In a pn junction leakage current is due to

Minority carriers

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