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PN Junction and Semiconductor theory

Total questions: 12

Worksheet time: 4mins

Name
Class
Date
1.

Which of the following is a property of intrinsic semiconductors?

a)
Has a fixed number of electrons regardless of temperature.
b)
Equal number of electrons and holes.
c)
Higher number of holes than electrons.
d)
Conducts electricity without any doping.
2.

What type of semiconductor is formed when silicon is doped with phosphorus?

a)
n-type semiconductor
b)
superconductor
c)
intrinsic semiconductor
d)
p-type semiconductor
3.

In a P-N junction at equilibrium, the electric field across the junction:

a)

Drives electrons from P to N

b)

Drives holes from N to P

c)

Prevents further diffusion of carriers

d)

Is zero

4.

The depletion region in a P-N junction is formed due to:

a)
The diffusion of charge carriers across the junction.
b)

Recombination of majority carriers

c)

Accumulation of minority carriers

d)
The application of external voltage to the junction.
5.

What is the majority carrier in an N-type semiconductor?

a)
Protons
b)
Holes
c)
Neutrons
d)
Electrons
6.

Which element is commonly used as an acceptor impurity in silicon?

a)
Phosphorus
b)
Arsenic
c)
Boron
d)

Antimony

7.

The energy gap in semiconductors is typically in the range of:

a)
1 eV to 3 eV
b)
4 eV to 6 eV
c)

0.01 eV to 0.1 eV

d)
10 eV to 15 eV
8.

In a P-type semiconductor, the minority carriers are:

a)
electrons
b)
neutrons
c)
protons
d)
holes
9.

The forward voltage drop of a silicon diode is approximately:

a)
0.7 volts
b)

0.5 volts

c)

1.2 volts

d)
0.3 volts
10.

What is the effect of increasing temperature on the conductivity of intrinsic semiconductors?

a)
Increasing temperature increases the conductivity of intrinsic semiconductors.
b)
Increasing temperature decreases the conductivity of intrinsic semiconductors.
c)
Temperature has no effect on the conductivity of intrinsic semiconductors.
d)
Conductivity of intrinsic semiconductors is only affected by pressure, not temperature.
11.

Which of the following materials is not a semiconductor?

a)
Silicon
b)
Gallium Arsenide
c)
Germanium
d)
Copper
12.

When a P-N junction is forward biased, the width of the depletion region:

a)
increases
b)
fluctuates
c)
decreases
d)
remains the same