Semiconductors MCQs | Semiconductors Short Questions and Answers

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Questions
41 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
42 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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43 At absolute temperature, an intrinsic semiconductor has ……….
A A few free electrons
B Many holes
C Many free electrons
D No holes or free electrons

Answer: No holes or free electrons
44 At room temperature, an intrinsic silicon crystal acts approximately as ……
A A battery
B A conductor
C An insulator
D A piece of copper wire

Answer: An insulator
45 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
46 At room temperature, an intrinsic semiconductor has ……….
A Many holes only
B A few free electrons and holes
C Many free electrons only
D No holes or free electrons

Answer: A few free electrons and holes
47 A pn junction acts as a ……….
A Controlled switch
B Bidirectional switch
C Unidirectional switch
D None of the above

Answer: Unidirectional switch
48 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
49 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
50 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
51 Addition of trivalent impurity to a semiconductor creates many ……..
A Holes
B Free electrons
C Valence electrons
D Bound electrons

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

Answer: Electrically neutral
53 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
54 The strength of a semiconductor crystal comes from ……..
A Forces between nuclei
B Forces between protons
C Electron-pair bonds
D None of the above

Answer: Electron-pair bonds
55 The resistivity of a pure silicon is about ……………
A 100 O cm
B 6000 O cm
C 3 x 105 O m
D 6 x 10-8 O cm

Answer: 6000 O cm
56 How is charge carriers produced in intrinsic semiconductors?
A By pure atoms
B By electrons
C By impure atoms
D By holes

Answer: By impure atoms
57 Which of the following is known as indirect band gap semiconductors?
A Germanium
B Nickel
C Platinum
D Carbon

Answer: Germanium
58 How is the resistance of semiconductor classified?
A High resistance
B Positive temperature co-efficient
C Negative temperature co-efficient
D Low resistance

Answer: Negative temperature co-efficient
59 Under normal conditions a diode conducts current when it is ……………
A reverse biased
B forward biased
C avalanched
D saturated

Answer: forward biased
60 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

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