Semiconductors MCQs | Semiconductors Multiple Choice Questions and Answers

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Questions
1 A semiconductor is formed by ……… bonds.
A Covalent
B Electrovalent
C Co-ordinate
D None of the above

Answer: Covalent
2 The most commonly used semiconductor is ………..
A Germanium
B Silicon
C Carbon
D Sulphur

Answer: Silicon
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3 The resistivity of pure germanium under standard conditions is about ……….
A 6 x 104
B Ω cm
C 60
D 3 x 106

Answer: Ω cm
4 When a pure semiconductor is heated, its resistance …………..
A Goes up
B Goes down
C Remains the same
D Can’t say

Answer: Goes down
5 When a pentavalent impurity is added to a pure semiconductor, it becomes ………
A An insulator
B An intrinsic semiconductor
C p-type semiconductor
D n-type semiconductor

Answer: n-type semiconductor
6 Addition of pentavalent impurity to a semiconductor creates many ……..
A Free electrons
B Holes
C Valence electrons
D Bound electrons

Answer: Free electrons
7 An n-type semiconductor is ………
A Positively charged
B Negatively charged
C Electrically neutral
D None of the above

Answer: Electrically neutral
8 Addition of trivalent impurity to a semiconductor creates many ……..
A Holes
B Free electrons
C Valence electrons
D Bound electrons

Answer: Holes
9 A hole in a semiconductor is defined as …………….
A A free electron
B The incomplete part of an electron pair bond
C A free proton
D A free neutron

Answer: The incomplete part of an electron pair bond
10 The impurity level in an extrinsic semiconductor is about ….. of pure semiconductor.
A 10 atoms for 108 atoms
B 1 atom for 108 atoms
C 1 atom for 104 atoms
D 1 atom for 100 atoms

Answer: 1 atom for 108 atoms
11 A hole and electron in close proximity would tend to ……….
A Repel each other
B Attract each other
C Have no effect on each other
D None of the above

Answer: Attract each other
12 In a semiconductor, current conduction is due to ……..
A Only holes
B Only free electrons
C Holes and free electrons
D None of the above

Answer: Holes and free electrons
13 A forward biased pn junction diode has a resistance of the order of
A Ω
B kΩ
C MΩ
D None of the above

Answer: Ω
14 The barrier voltage at a pn junction for germanium is about ………
A 5 V
B 3 V
C Zero
D 3 V

Answer: 3 V
15 In the depletion region of a pn junction, there is a shortage of ……..
A Acceptor ions
B Holes and electrons
C Donor ions
D None of the above

Answer: Holes and electrons
16 A reverse bias pn junction has …………
A Very narrow depletion layer
B Almost no current
C Very low resistance
D Large current flow

Answer: Almost no current
17 When the temperature of an extrinsic semiconductor is increased, the pronounced effect is on……
A Junction capacitance
B Minority carriers
C Majority carriers
D None of the above

Answer: Minority carriers
18 With forward bias to a pn junction , the width of depletion layer ………
A Decreases
B Increases
C Remains the same
D None of the above

Answer: Decreases
19 The leakage current in a pn junction is of the order of
A Aa
B mA
C kA
D µA

Answer: µA
20 In an intrinsic semiconductor, the number of free electrons ………
A Equals the number of holes
B Is greater than the number of holes
C Is less than the number of holes
D None of the above

Answer: Equals the number of holes

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