Semiconductors Objective Type Questions and Answers

Questions

21 A semiconductor has generally ……………… valence electrons.

A 2

B 3

C 6

D 4

View Answer

Answer: 4

22 A semiconductor has ………… temperature coefficient of resistance.

A Positive

B Zero

C Negative

D None of the above

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

Answer: Insulator

36 What are the charge carriers in semiconductors?

A Electrons and holes

B Electrons

C Holes

D Charges

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

Answer: Minority carriers

ADRE 2.0 FULL LENGTH MOCK TEST

Take Mock Tests

Missiles Mock Test	Start Test!
SSC MTS Mock Test	Start Test
IBPS CLERK MOCK TEST	Start Test
SSC MTS 2022 JULY 26 Shift 1 (ENGLISH)	Start Test!
SSC GD Previous Year Paper 2021 Nov 17 Shift - I (Hindi)	Start Test!
SSC CGL Tier - 1 PYP 2022 April 21 Shift- 1 (ENGLISH)	Start Test!
MPSC PAPER I MOCK TEST 1 (ENGLISH)	Start Test!
IB Security Assistant Mock test 1 (english)	Start Test!
UP POLICE CONSTABLE MOCK TEST 1	Start Test!
DELHI POLICE CONSTABLE MOCK TEST 1 (HINDI)	Start Test!