57 + Mcqs in Semiconductor Theory Page 1 McqOptions

1.	A semiconductor is formed bybonds.
A.	ovalent
B.	lectrovalent
C.	o-ordinate
D.	one of the above
Answer» B. lectrovalent

Discussion

2.	The impurity level in an extrinsic semiconductor is aboutof pure semiconductor.
A.	0 atoms for 108 atoms
B.	atom for 108 atoms
C.	atom for 104 atoms
D.	atom for 100 atoms
Answer» C. atom for 104 atoms

Discussion

3.	An n-type semiconductor is
A.	Positively charged
B.	Negatively charged
C.	Electrically neutral
D.	None of the above
Answer» D. None of the above

Discussion

4.	The most commonly used semiconductor is ___________
A.	Germanium
B.	Silicon
C.	Carbon
D.	Sulphur
Answer» C. Carbon

Discussion

5.	A reverse bias pn junction has ___________
A.	Very narrow depletion layer
B.	Almost no current
C.	Very low resistance
D.	Large current flow
Answer» C. Very low resistance

Discussion

6.	When a pure semiconductor is heated, its resistance ___________
A.	Goes up
B.	Goes down
C.	Remains the same
D.	Can?t say
Answer» C. Remains the same

Discussion

7.	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» B. Majority carriers

Discussion

8.	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» C. Donor ions

Discussion

9.	The barrier voltage at a pn junction for germanium is about
A.	5.0 V
B.	3.0 V
C.	Zero
D.	0.3 V
Answer» E.

Discussion

10.	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» E.

Discussion

11.	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» B. Is greater than the number of holes

Discussion

12.	Addition of trivalent impurity to a semiconductor creates many
A.	Holes
B.	Free electrons
C.	Valence electrons
D.	Bound electrons
Answer» B. Free electrons

Discussion

13.	Addition of pentavalent impurity to a semiconductor creates many
A.	Free electrons
B.	Holes
C.	Valence electrons
D.	Bound electrons
Answer» B. Holes

Discussion

14.	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» C. Majority carriers

Discussion

15.	The leakage current in a pn junction is of the order of
A.	Aa
B.	mA
C.	kA
D.	µA
Answer» E.

Discussion

16.	A semiconductor is formed by bonds.
A.	Covalent
B.	Electrovalent
C.	Co-ordinate
D.	None of the above
Answer» B. Electrovalent

Discussion

17.	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» E.

Discussion

18.	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» C. Many free electrons only

Discussion

19.	A semiconductor has ___________ temperature coefficient of resistance.
A.	Positive
B.	Zero
C.	Negative
D.	None of the above
Answer» D. None of the above

Discussion

20.	A pentavalent impurity has ___________ Valence electrons
A.	3
B.	5
C.	4
D.	6
Answer» C. 4

Discussion

21.	A semiconductor has generally ___________ valence electrons.
A.	2
B.	3
C.	6
D.	4
Answer» E.

Discussion

22.	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» C. Have no effect on each other

Discussion

23.	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» C. 1 atom for 104 atoms

Discussion

24.	An n-type semiconductor is~!
A.	Positively charged
B.	Negatively charged
C.	Electrically neutral
D.	None of the above
Answer» D. None of the above

Discussion

25.	The most commonly used semiconductor is ___________~!
A.	Germanium
B.	Silicon
C.	Carbon
D.	Sulphur
Answer» C. Carbon

Discussion

26.	A pentavalent impurity has ___________ Valence electrons%!
A.	3
B.	5
C.	4
D.	6
Answer» C. 4

Discussion

27.	*$_A pentavalent impurity has ___________ Valence electrons?
A.	3
B.	5
C.	4
D.	6
Answer» C. 4

Discussion

28.	/_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» E.

Discussion

29.	/_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» B. Is greater than the number of holes

Discussion

30.	/_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» C. Majority carriers

Discussion

31.	/_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» C. Donor ions

Discussion

32.	/_A reverse bias pn junction has ___________?
A.	Very narrow depletion layer
B.	Almost no current
C.	Very low resistance
D.	Large current flow
Answer» C. Very low resistance

Discussion

33.	_ A semiconductor has generally ___________ valence electrons.$?
A.	2
B.	3
C.	6
D.	4
Answer» E.

Discussion

34.	_ 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» C. Many free electrons only

Discussion

35.	_ Addition of trivalent impurity to a semiconductor creates many$?
A.	Holes
B.	Free electrons
C.	Valence electrons
D.	Bound electrons
Answer» B. Free electrons

Discussion

36.	_ The leakage current in a pn junction is of the order of$?
A.	Aa
B.	mA
C.	kA
D.	¬¨¬µA
Answer» E.

Discussion

37.	_ The barrier voltage at a pn junction for germanium is about$?
A.	5 V
B.	3 V
C.	Zero
D.	3 V
Answer» E.

Discussion

38.	_ When a pure semiconductor is heated, its resistance ___________$?
A.	Goes up
B.	Goes down
C.	Remains the same
D.	Can?t say
Answer» C. Remains the same

Discussion

39.	_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» C. Have no effect on each other

Discussion

40.	_A semiconductor has ___________ temperature coefficient of resistance.$?
A.	Positive
B.	Zero
C.	Negative
D.	None of the above
Answer» D. None of the above

Discussion

41.	_Addition of pentavalent impurity to a semiconductor creates many$?
A.	Free electrons
B.	Holes
C.	Valence electrons
D.	Bound electrons
Answer» B. Holes

Discussion

42.	_A semiconductor is formed by bonds.$?
A.	Covalent
B.	Electrovalent
C.	Co-ordinate
D.	None of the above
Answer» B. Electrovalent

Discussion

43.	_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» E.

Discussion

44.	_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» B. Majority carriers

Discussion

45.	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» C. 1 atom for 104 atoms

Discussion

46.	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» C. 1 atom for 104 atoms

Discussion

47.	A reverse biased pn junction has resistance of the order of
A.	≈í¬©
B.	k≈í¬©
C.	M≈í¬©
D.	None of the above
Answer» D. None of the above

Discussion

48.	A pn junction acts as a ___________
A.	Controlled switch
B.	Bidirectional switch
C.	Unidirectional switch
D.	None of the above
Answer» D. None of the above

Discussion

49.	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» B. Increases

Discussion

50.	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» D. None of the above

Discussion

Explore topic-wise MCQs in Electrical Engineering.

A semiconductor is formed bybonds.

The impurity level in an extrinsic semiconductor is aboutof pure semiconductor.

An n-type semiconductor is

The most commonly used semiconductor is ___________

A reverse bias pn junction has ___________

When a pure semiconductor is heated, its resistance ___________

The leakage current across a pn junction is due to ___________

In the depletion region of a pn junction, there is a shortage of

The barrier voltage at a pn junction for germanium is about

When a pentavalent impurity is added to a pure semiconductor, it becomes

In an intrinsic semiconductor, the number of free electrons

Addition of trivalent impurity to a semiconductor creates many

Addition of pentavalent impurity to a semiconductor creates many

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

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

A semiconductor is formed by bonds.

At absolute temperature, an intrinsic semiconductor has ___________

At room temperature, an intrinsic semiconductor has ___________

A semiconductor has ___________ temperature coefficient of resistance.

A pentavalent impurity has ___________ Valence electrons

A semiconductor has generally ___________ valence electrons.

A hole and electron in close proximity would tend to ___________

The impurity level in an extrinsic semiconductor is about of pure semiconductor.

An n-type semiconductor is~!

The most commonly used semiconductor is ___________~!

A pentavalent impurity has ___________ Valence electrons%!

*$_A pentavalent impurity has ___________ Valence electrons?

*/*_At absolute temperature, an intrinsic semiconductor has ___________?

*/*_In an intrinsic semiconductor, the number of free electrons?

*/*_When the temperature of an extrinsic semiconductor is increased, the pronounced effect is on?

*/*_In the depletion region of a pn junction, there is a shortage of?

*/*_A reverse bias pn junction has ___________?

_ A semiconductor has generally ___________ valence electrons.$?

_ At room temperature, an intrinsic semiconductor has ___________$?

_ Addition of trivalent impurity to a semiconductor creates many$?

_ The leakage current in a pn junction is of the order of$?

_ The barrier voltage at a pn junction for germanium is about$?

_ When a pure semiconductor is heated, its resistance ___________$?

_A hole and electron in close proximity would tend to ___________$?

_A semiconductor has ___________ temperature coefficient of resistance.$?

_Addition of pentavalent impurity to a semiconductor creates many$?

_A semiconductor is formed by bonds.$?

_When a pentavalent impurity is added to a pure semiconductor, it becomes$?

_The leakage current across a pn junction is due to ___________$?

The impurity level in an extrinsic semiconductor is about of pure semiconductor.$?

The impurity level in an extrinsic semiconductor is about of pure semiconductor.?

A reverse biased pn junction has resistance of the order of

A pn junction acts as a ___________

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

As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor ___________

/_At absolute temperature, an intrinsic semiconductor has ___________?

/_In an intrinsic semiconductor, the number of free electrons?

/_When the temperature of an extrinsic semiconductor is increased, the pronounced effect is on?

/_In the depletion region of a pn junction, there is a shortage of?

/_A reverse bias pn junction has ___________?