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How many valence electrons does a silicon atom have?
2
4
1
3

What is the resistor value of an ideal diode in the region of conduction?
5 kOhm
0 kOhm
Undefined
Infinity

Under normal conditions a diode conducts current when it is
forward-biased
reverse-biased
saturated
avalanched

As the forward current through a silicon diode increases, the internal resistance
increases
decreases
remains the same

The boundary between p-type material and n-type material is called
a reverse-biased diode
a forward-biased diode
a pn junction
a diode

An ideal diode presents a(n) ________ when reversed-biased and a(n) ________ when forward-biased
short, open
open, open
open, short
short, short

What factor(s) do(es) the barrier potential of a pn junction depend on?
type of semiconductor material
the amount of doping
the temperature
all of the above

When an electron jumps from the valence shell to the conduction band, it leaves a gap. What is this gap called?
electron-hole pair
energy gap
hole
recombination

What can a semiconductor sense?
pressure
temperature
magnetism
all the above

A P-N junction mimics a closed switch when it:
is reverse biased
has a wide depletion region
cannot overcome its barrier voltage
has a low junction resistance

In “n” type material, majority carriers would be:
holes
dopants
electrons
slower

What causes the depletion region?
doping
diffusion
ions
barrier potential

The mobility of electrons in a material is expressed in unit of:
V/s
m2 /V-s
m2 /s
J/K

The energy gap in a semiconductor
Increases with temperature
Does not change with temperature
Decreases with temperature
Is zero

The forbidden gap for germanium is
0.12 eV
0.72 eV
7.2 eV
None of these

At room temperature a semiconductor material is
Perfect insulator
Conductor
Slightly conducting
Any one of the above

The process of adding impurities to a pure semiconductor is called
Mixing
Doping
Diffusing
None of the above

A covalent bond is when atoms lose valence shell electrons.
True
False

When a voltage is placed across a semiconductor, free electrons move toward the positive voltage.
True
False

The P-N junction is a barrier to electron flow.
True
False

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