Table of Content  
4.1 Thermionic Emission and Cathode Ray
4.2 Carthode Ray Oscilloscope
4.3 Semiconductor
4.4 Semiconductor Diode
4.5 Trasistor
4.6 Logic Gate

Semiconductor

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1) Which of the following substances are widely used in electronic industry to build electronic component?
  1. Gold
  2. Silicon
  3. Germanium
  4. Copper
Choice 1
I and II only
Choice 2
II and IV only
Choice 3
II and III only
Choice 4 I and IV only


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2) ________ is a process of adding some impurities into a pure semiconductor to increase their conductivity.

Choice 1
Doping
Choice 2
Rectification
Choice 3
Alloying
Choice 4 Mixing



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3) The p-type semiconductor is produced by doping _____________ atoms into a pure semiconductor.


Choice 1
trivalence
Choice 2
tetravalence
Choice 3
pentavalence
Choice 4 electrovalaence


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structure of a p-type semiconductor

4) The diagram shows the arrangement of atoms of a ___________ semiconductor.

Choice 1
p-type
Choice 2
n-type
Choice 3
np-type
Choice 4 pn-type


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5) Which of the following statements are not true about an n-type semiconductor?


Choice 1
The majority charge carrier is electrons.
Choice 2
It is produced by doping trivalent atom into a pure semiconductor.
Choice 3
Its conductivity is higher than pure semiconductor.
Choice 4 Its amount of holes is less than electrons.


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6) Which of the following is true about the current flows in a p-type semiconductor when it is connected to a cell?

Choice 1
The majority charge carriers are electrons and they move towards the positive terminal of the cell.
Choice 2
The majority charge carriers are holes and they move towards the positive terminal of the cell.
Choice 3
The movement of the holes form minority current.
Choice 4 The rate of flow of electrons and holes depends on the e.m.f. of the cell.


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7) At room temperature a pure silicon crystal acts approximately like

Choice 1
a cell
Choice 2
a conductor
Choice 3
a superconductor
Choice 4 an insulator


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8) A semiconductor has how many types flow?

Choice 1
1
Choice 2
2
Choice 3
3
Choice 4 4


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electromagnetism notes