A level Semiconductor Electronics Quiz 1

16 Questions

Quiz Description

Semiconductors have always been known for their use in the production of electronic devices and electronic device components. This quiz in physics will help you understand what semiconductors are, and their types but we will be concentration on what these semiconductors are. This quiz is exam standard and good for any student preparing for a test or exams.

A semiconductor can be defined as a solid substance that has a conductivity between that of an insulator and that of most metals, either due to the addition of an impurity or because of temperature effects. These substances are used in the manufacture of various kinds of electronic devices, hence semiconductor electronics, including diodes, transistors, and integrated circuits. There are two categories of semiconductors, Intrinsic and extrinsic semiconductors. Intrinsic semiconductors are those we will refer to as pure while extrinsic semiconductors are impure.

Knowledge of these quizzes is important even to our practical life as an economy. So take the quiz and learn more about semiconductors.
Enjoy! 

1:

 In a semiconductor


Correct
  • 1:
    there are no free electrons at 0 K
  • 2:
    there are no free electrons at any temperature
  • 3:
    the number of free electrons increases with pressure
  • 4:
    the number of free electrons is more than that in a conductor
2:

 Let nh and ne be the number of holes and conduction electrons in an extrinsic semiconductor. Then


Correct
  • 1:
    nh > ne
  • 2:
    nh = ne
  • 3:
    nh < ne
  • 4:
    nh ≠ ne
3:

A p-type semiconductor is


Correct
  • 1:
    positively charged
  • 2:
    negatively charged
  • 3:
    uncharged
  • 4:
    uncharged at 0K but charged at higher temperatures
4:

Electric conduction in a semiconductor takes place due to


Correct
  • 1:
    electrons only
  • 2:
    holes only
  • 3:
    both electrons and holes
  • 4:
    neither electrons nor holes
5:

The impurity atoms with which pure silicon may be doped to make it a p-type semiconductor are those of


Correct
  • 1:
    phosphorus
  • 2:
    boron
  • 3:
    antimony
  • 4:
    nitrogen
6:

The electrical conductivity of pure germanium can be increased by


Correct
  • 1:
    increasing the temperature
  • 2:
    doping acceptor impurities
  • 3:
    doping donor impurities
  • 4:
    All of the above
7:

The resistivity of a semiconductor at room temperature is in between


Correct
  • 1:
    10^–2 to 10^–5 Ω cm
  • 2:
    10^–3 to 10^6 Ω cm
  • 3:
    10^6 to 10^8 Ω cm
  • 4:
    10^10 to 10^12 Ω cm
8:

Number of electrons in the valence shell of a pure semiconductor is


Correct
  • 1:
    1
  • 2:
    2
  • 3:
    3
  • 4:
    4
9:

In a semiconductor, the forbidden energy gap between the valence band and the conduction band is of the order is


Correct
  • 1:
    1 MeV
  • 2:
    0.1 Mev
  • 3:
    1 eV
  • 4:
    5 eV
10:

The forbidden energy gap for germanium crystal at 0 K is


Correct
  • 1:
    0.071 eV
  • 2:
    0.71 eV
  • 3:
    2.57 eV
  • 4:
    6.57 eV
11:

In an insulator, the forbidden energy gap between the valence band and conduction band is of the order of


Correct
  • 1:
    1 MeV
  • 2:
    0.1 MeV
  • 3:
    1 eV
  • 4:
    5 eV
12:

What is the resistivity of a pure semiconductor at absolute zero ?


Correct
  • 1:
    Zero
  • 2:
    Infinity
  • 3:
    Same as that of conductors at room temperature
  • 4:
    Same as that of insulators at room temperature
13:

Temperature coefficient of resistance of semiconductor is


Correct
  • 1:
    zero
  • 2:
    constant
  • 3:
    positive
  • 4:
    negative
14:

In a p-type semiconductor, the acceptor valence band is


Correct
  • 1:
    close to the valence band of the host crystal
  • 2:
    close to conduction band of the host crystal
  • 3:
    below the conduction band of the host crystal
  • 4:
    above the conduction band of the host crystal
15:

In an n-type semiconductor, donor valence band is


Correct
  • 1:
    above the conduction band of the host crystal
  • 2:
    close to the valence band of the host crystal
  • 3:
    close to the conduction band of the host crystal
  • 4:
    below the valence band of the host crystal
16:

The mobility of free electrons is greater than that of free holes because


Correct
  • 1:
    they are light
  • 2:
    they carry negative charge
  • 3:
    they mutually collide less
  • 4:
    they require low energy to continue their motion

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A level Semiconductor Electronics Quiz 1
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