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Chapter 2

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semiconductors
Katrina Himes
Quiz by Katrina Himes, updated more than 1 year ago
Katrina Himes
Created by Katrina Himes about 6 years ago
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Resource summary

Question 1

Question
The nucleus of a copper atom contains how many protons?
Answer
  • 1
  • 4
  • 18
  • 29

Question 2

Question
The net charge of a neutral copper atom is
Answer
  • 0
  • +1
  • -1
  • +4

Question 3

Question
Assume the valence electron is removed from a copper atom. The net charge of the atom becomes
Answer
  • 0
  • +1
  • -1
  • +4

Question 4

Question
The valence electron of a copper atom experiences what kind of attraction toward the nucleus ?
Answer
  • None
  • Weak
  • Strong
  • Impossible to say

Question 5

Question
How many valence electrons does a silicon atom have?
Answer
  • 0
  • 1
  • 2
  • 4

Question 6

Question
Which is the most widely used semiconductor?
Answer
  • Copper
  • Germanium
  • Silicon
  • None of the above

Question 7

Question
How many protons does the nucleus of a silicon atom contain?
Answer
  • 4
  • 14
  • 29
  • 32

Question 8

Question
Silicon atoms combine into an orderly pattern called a
Answer
  • Covalent bond
  • Crystal
  • Semiconductor
  • Valence orbit

Question 9

Question
An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?
Answer
  • Doping
  • Free electrons
  • Thermal energy
  • Valence electrons

Question 10

Question
When an electron is moved to a higher orbit level, its energy level with respect to the nucleus
Answer
  • Increases
  • Decreases
  • Remains the same
  • Depends on the type of atom

Question 11

Question
The merging of a free electron and a hole is called
Answer
  • Covalent bonding
  • Lifetime
  • Recombination
  • Thermal energy

Question 12

Question
At room temperature, an intrinsic silicon crystal acts approximately like
Answer
  • A battery
  • A conductor
  • An insulator
  • A piece of copper wire

Question 13

Question
The amount of time between the creation of a hole and its disappearance is called
Answer
  • Doping
  • Lifetime
  • Recombination
  • Valence

Question 14

Question
The valence electron of a conductor can also be called a
Answer
  • Bound electron
  • Free electron
  • Nucleus
  • Proton

Question 15

Question
A conductor has how many types of flow?
Answer
  • 1
  • 2
  • 3
  • 4

Question 16

Question
A semiconductor has how many types of flow?
Answer
  • 1
  • 2
  • 3
  • 4

Question 17

Question
When a voltage is applied to a semiconductor, holes will flow
Answer
  • Away from the negative potential
  • Toward the positive potential
  • In the external circuit
  • None of the above

Question 18

Question
For semiconductor material, its valence orbit is saturated when it contains
Answer
  • One electron
  • Equal (+) and (-) ions
  • Four electrons
  • Eight electrons

Question 19

Question
In an intrinsic semiconductor, the number of holes
Answer
  • Equals the number of free electrons
  • Is greater than the number of free electrons
  • Is less than the number of free electrons
  • None of the above

Question 20

Question
Absolute zero temperature equals
Answer
  • -273 °C
  • 0 °C
  • 25 °C
  • 50 °C

Question 21

Question
At absolute zero temperature, an intrinsic semiconductor has
Answer
  • A few free electrons
  • Many holes
  • Many free electrons
  • No holes or free electrons

Question 22

Question
At room temperature, an intrinsic semiconductor has
Answer
  • A few free electrons and holes
  • Many holes
  • Many free electrons
  • No holes

Question 23

Question
The number of free electrons and holes in an intrinsic semiconductor decreases when the temperature
Answer
  • Decreases
  • Increases
  • Stays the same
  • None of the above

Question 24

Question
The flow of valence electrons to the right means that holes are flowing to the
Answer
  • Left
  • Right
  • Either way
  • None of the above

Question 25

Question
Holes act like
Answer
  • Atoms
  • Crystals
  • Negative charges
  • Positive charges

Question 26

Question
Trivalent atoms have how many valence electrons?
Answer
  • 1
  • 3
  • 4
  • 5

Question 27

Question
An acceptor atom has how many valence electrons?
Answer
  • 1
  • 3
  • 4
  • 5

Question 28

Question
If you wanted to produce a p-type semiconductor, which of these would you use?
Answer
  • Acceptor atoms
  • Donor atoms
  • Pentavalent impurity
  • Silicon

Question 29

Question
Electrons are the minority carriers in which type of semiconductor?
Answer
  • Extrinsic
  • Intrinsic
  • n-type
  • p-type

Question 30

Question
How many free electrons does a p-type semiconductor contain?
Answer
  • Many
  • None
  • Only those produced by thermal energy
  • Same number as holes

Question 31

Question
Silver is the best conductor. How many valence electrons do you think it has?
Answer
  • 1
  • 4
  • 18
  • 29

Question 32

Question
Suppose an intrinsic semiconductor has 1 billion free electrons at room temperature. If the temperature drops to 0°C, how many holes are there?
Answer
  • Fewer than 1 billion
  • 1 billion
  • More than 1 billion
  • Impossible to say

Question 33

Question
An external voltage source is applied to a p-type semiconductor. If the left end of the crystal is positive, which way do the majority carriers flow?
Answer
  • Left
  • Right
  • Neither
  • Impossible to say

Question 34

Question
Which of the following doesn't fit in the group?
Answer
  • Conductor
  • Semiconductor
  • Four valence electrons
  • Crystal structure

Question 35

Question
Which of the following is approximately equal to room temperature?
Answer
  • 0°C
  • 25°C
  • 50°C
  • 75°C

Question 36

Question
How many electrons are there in the valence orbit of a silicon atom within a crystal?
Answer
  • 1
  • 4
  • 8
  • 14

Question 37

Question
Negative ions are atoms that have
Answer
  • Gained a proton
  • Lost a proton
  • Gained an electron
  • Lost an electron

Question 38

Question
Which of the following describes an n-type semiconductor?
Answer
  • Neutral
  • Positively charged
  • Negatively charged
  • Has many holes

Question 39

Question
A p-type semiconductor contains holes an
Answer
  • Positive ions
  • Negative ions
  • Pentavalent atoms
  • Donor atoms

Question 40

Question
Which of the following describes a p-type semiconductor?
Answer
  • Neutral
  • Positively charged
  • Negatively charged
  • Has many free elctrons

Question 41

Question
When compared to a germanium diode, a silicon diode's reverse saturation current is
Answer
  • Equal at high temperatures
  • Lower
  • Equal at lower temperatures
  • Higher

Question 42

Question
What causes the depletion layer?
Answer
  • Doping
  • Recombination
  • Barrier potential
  • Ions

Question 43

Question
What is the barrier potential of a silicon diode at room temperature?
Answer
  • 0.3 V
  • 0.7 V
  • 1 V
  • 2 mV per degree Celsius

Question 44

Question
When comparing the energy gap of germanium and silicon atoms, a silicon atom's energy gap is
Answer
  • About the same
  • Lower
  • Higher
  • Unpredictable

Question 45

Question
In a silicon diode, the reverse current is usually
Answer
  • Very small
  • Very large
  • Zero
  • In the breakdown region

Question 46

Question
While maintaining a constant temperature, a silicon diode has its reverse-bias voltage increased. The diode's saturation current will
Answer
  • Increase
  • Decrease
  • Remain the same
  • Equal its surface-leakage current

Question 47

Question
The voltage where avalanche occurs is called the
Answer
  • Barrier potential
  • Depletion layer
  • Knee voltage
  • Breakdown voltage

Question 48

Question
The width of a diode's depletion layer will decrease when the diode is
Answer
  • Forward biased
  • First formed
  • Reverse biased
  • Not conducting

Question 49

Question
When the reverse voltage decreases from 10 to 5 V, the depletion layer
Answer
  • Becomes smaller
  • Becomes larger
  • Is unaffected
  • Breaks down

Question 50

Question
When a diode is forward biased, the recombination of free electrons and holes may produce
Answer
  • Heat
  • Light
  • Radiation
  • All of the above

Question 51

Question
A reverse voltage of 10 V is across a diode. What is the voltage across the depletion layer?
Answer
  • 0 V
  • 0.7 V
  • 10 V
  • None of the above

Question 52

Question
The energy gap in a silicon atom is the distance between the valence band and the
Answer
  • Nucleus
  • Conduction band
  • Atom's core
  • Positive ions

Question 53

Question
The reverse saturation current doubles when the junction temperature increases
Answer
  • 1°C
  • 2°C
  • 4°C
  • 10°C

Question 54

Question
The surface-leakage current doubles when the reverse voltage increases
Answer
  • 7%
  • 100%
  • 200%
  • 2 mV
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