Semiconductors Quiz | Semiconductors Objective Type Questions and Answers

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Questions
21 A semiconductor has generally ……………… valence electrons.
A 2
B 3
C 6
D 4

Answer: 4
22 A semiconductor has ………… temperature coefficient of resistance.
A Positive
B Zero
C Negative
D None of the above

Answer: Negative
23 The resistivity of a pure silicon is about ……………
A 100 Ω cm
B 6000 Ω cm
C 3 x 105 Ω m
D 6 x 10-8 Ω cm

Answer: 6000 Ω cm
24 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
25 As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor ………..
A Remains the same
B Increases
C Decreases
D None of the above

Answer: Decreases
26 The random motion of holes and free electrons due to thermal agitation is called ……….
A Diffusion
B Pressure
C Ionisation
D None of the above

Answer: Diffusion
27 The battery connections required to forward bias a pn junction are ……
A +ve terminal to p and –ve terminal to n
B -ve terminal to p and +ve terminal to n
C -ve terminal to p and –ve terminal to n
D None of the above

Answer: +ve terminal to p and –ve terminal to n
28 A pn junction acts as a ……….
A Controlled switch
B Bidirectional switch
C Unidirectional switch
D None of the above

Answer: Unidirectional switch
29 A reverse biased pn junction has resistance of the order of
A Ω
B kΩ
C MΩ
D None of the above

Answer: MΩ
30 The leakage current across a pn junction is due to …………..
A Minority carriers
B Majority carriers
C Junction capacitance
D None of the above

Answer: Minority carriers
31 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
32 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
33 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
34 The term bias in electronics usually means ……….
A the value of ac voltage in the signal
B the condition of current through a pn junction
C the value of dc voltages for the device to operate properly
D the status of the diode

Answer: the value of dc voltages for the device to operate properly
35 How does a semiconductor behave at absolute zero?
A Conductor
B Insulator
C Semiconductor
D Protection device

Answer: Insulator
36 What are the charge carriers in semiconductors?
A Electrons and holes
B Electrons
C Holes
D Charges

Answer: Electrons and holes
37 Which column elements are combined to make compound semiconductors?
A First and fourth
B Fifth and sixth
C Second and fourth
D Third and fifth

Answer: Third and fifth
38 What type of material is obtained when an intrinsic semiconductor is doped with pentavalent impurity?
A N-type semiconductor
B Extrinsic semiconductor
C P-type semiconductor
D Insulator

Answer: N-type semiconductor
39 What type of material is obtained when an intrinsic semiconductor is doped with trivalent impurity?
A Extrinsic semiconductor
B Insulator
C N-type semiconductor
D P-type semiconductor

Answer: P-type semiconductor
40 The leakage current across a pn junction is due to …………..
A Minority carriers
B Majority carriers
C Junction capacitance
D None of the above

Answer: Minority carriers

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