Deck 1: Introduction to Semiconductors

Question 1

Silicon and germanium contain _ valence electrons

A)two
B)one
C)four
D)eight

Answer 1

C

Question 2

Electrons orbiting the nucleus of an atom are grouped into energy bands known as

A)shells
B)elevations
C)tracks
D)layers

Answer 2

A

Question 3

The majority carrier in a p- type semiconductor is

A)protons
B)holes
C)ions
D)electrons

Answer 3

B

Question 4

The following are all semiconductors except

A)gallium arsenide
B)silicon
C)germanium
D)copper

Question 5

Hole flow occurs in the conduction band.

Question 6

A p- type semiconductor has relatively few free electrons.

Question 7

An intrinsic semiconductor has

A)an excess of holes
B)a large number of impurities
C)an excess of electrons
D)none of the above

Question 8

Raising the temperature of an intrinsic semiconductor will

A)decrease free electrons
B)increase free electrons
C)there is no effect on free electrons

Question 9

The process of a conduction electron falling into a hole is called

A)falling
B)merging
C)recombination
D)ionization

Question 10

The energy difference between the valence band and the conduction band in a substance is called the thermal gap.

Question 11

The valence band has lower energy than he conduction band.

Question 12

The energy required to cause a valence electron to escape from the atom's influence is called the

A)ionization energy
B)potential energy
C)break- away energy
D)free energy

Question 13

Conduction in the conduction band of semiconductors is by the movement of

A)electrons
B)both electrons and holes
C)holes
D)none of the above

Question 14

In the quantum model of the atom, an orbital is a discrete energy level where an electron is found.

Question 15

The type of chemical bond that occurs in copper is

A)covalent
B)metallic
C)crystalline
D)ionic

Question 16

Silicon doped with impurities is used in the manufacture of semiconductor devices.

Question 17

Holes are the majority carriers in

A)a p- type semiconductor
B)an n- type semiconductor
C)a pn junction semiconductor
D)none of the above

Question 18

A trivalent atom is also called

A)a donor
B)a metal
C)a semiconductor
D)an acceptor

Question 19

In a pn junction, the layers where there are few charges near the junction is called the

A)valence region
B)depletion region
C)conductive region
D)boundary region

Question 20

A semiconductor is said to be a _ type of material

A)metallic
B)crystalline
C)liquid
D)gaseous

Question 21

The typical barrier potential for silicon is 0.3 V.