Electronics - Introduction To Semiconductor Theory
This includes semiconductor theory and diodes.
- 1.Every known element has
- A.
The same type of atoms
- B.
the same number if atoms
- C.
A unique type of atom
- D.
Several different types of atoms
- 2.An atom consists of
- A.
One nucleus and only one electron
- B.
One nucleus and one or more electrons
- C.
Protons, electrons, and neutrons
- D.
Answers (b) and (c)
- 3.The nucleus of an atom is made up of
- A.
Protons and neutrons
- B.
Electrons
- C.
Electrons and protons
- D.
Electrons and neutrons
- 4.The atomic number of silicon is
- A.
8
- B.
2
- C.
4
- D.
14
- 5.The atomic number of germanium is
- A.
8
- B.
2
- C.
4
- D.
32
- 6.The valence shell in a silicon atom has the number designation of
- A.
0
- B.
1
- C.
2
- D.
3
- 7.Valence electrons are
- A.
In the closest orbit to the nucleus
- B.
In the most distant orbit from the nucleus
- C.
In various orbits around the nucleus
- D.
Not associated with a particular atom
- 8.A positive ion is formed when
- A.
A valence electron breaks away from the atom
- B.
there are more holes than electrons in the outer orbit
- C.
Two atoms bond together
- D.
An atom gains an extra valence electron
- 9.The most widely used semiconductive material in electronic devices is
- A.
Germanium
- B.
Carbon
- C.
Copper
- D.
Silicon
- 10.The energy band in which free electrons exist is the
- A.
First band
- B.
Second band
- C.
Conduction band
- D.
Valence band
- 11.Electron-hole pairs are produced by
- A.
Recombination
- B.
Thermal energy
- C.
Ionization
- D.
Doping
- 12.Recombination is when
- A.
An electron falls into a hole
- B.
A positive and a negative ion bond together
- C.
A valence electron becomes a conduction electron
- D.
A crystal is formed
- 13.In a semiconductor crystal, the atoms are held together by
- A.
The interaction of valence electrons
- B.
Forces of attraction
- C.
Covalent bonds
- D.
Answers (A), (B), and (C)
- 14.Each atom in a silicon crystal has
- A.
Four valence electrons
- B.
Four conduction electrons
- C.
Eight valence electrons, four of its own and four shared
- D.
No valence electrons because all are shared with other atoms
- 15.The current in a semiconductor is produced by
- A.
Electron only
- B.
Holes only
- C.
Negative ions
- D.
Both electrons and holes
- 16.In an intrinsic semiconductor,
- A.
There are no free electrons
- B.
The free electrons are thermally produced
- C.
There are only holes
- D.
There are many electrons as there are holes
- E.
Answers (B) and (D)
- 17.The difference between an insulator and a semiconductor is
- A.
A wider energy gap between the valence band and the conduction band
- B.
The number of free electrons
- C.
The atomic structure
- D.
Answers (A), (B), and (C)
- 18.The process of adding an impurity to an intrinsic semiconductor is called
- A.
Doping
- B.
Recombination
- C.
Atomic modification
- D.
Ionization
- 19.The trivalent impurity is added to silicon to create
- A.
Germanium
- B.
A p-type semiconductor
- C.
An n-type semiconductor
- D.
A depletion region
- 20.The purpose of pentavalent impurity is to
- A.
Reduce the conductivity of silicon
- B.
Increase the number of holes
- C.
Increase the number of free electrons
- D.
Create minority carriers
- 21.The majority carriers in an n-type semiconductor are
- A.
Holes
- B.
Valence electrons
- C.
Conduction electrons
- D.
Protons
- 22.Holes in an n-type semiconductor are
- A.
Minority carriers that are thermally produced
- B.
Minority carriers that are produced by doping
- C.
Majority carriers that are thermally produced
- D.
Majority carriers that are produced by doping
- 23.A pn junction is formed by
- A.
The recombination of electrons and holes
- B.
Ionization
- C.
The boundary of a p-type and an n-type material
- D.
The collision of a proton and a neutron
- 24.The depletion region is created by
- A.
Ionization
- B.
Diffusion
- C.
Recombinations
- D.
Answers (A), (B), and (C)
- 25.The depletion region consists of
- A.
Nothing but minority carriers
- B.
Positive and negative ions
- C.
No majority carriers
- D.
Answers (B) and (C)
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