Transistors and Semiconductors - Statistics

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This quiz has been taken 43 times
The average score is 15 of 49

Answer Stats

Question	Answer	% Correct
A semiconductor's resistivity lies between that of an insulator and a conductor. As temperature rises in semiconductors, resistance _______.	Decreases	76%
When an atom does not have a complete outer shell, it can form what kind of bonds with nearby atoms?	Covalent Bonds	73%
What do n-type semiconductors have more of?	Negative charge carriers	70%
	Ionic Bonds	67%
Compared to the current, what direction do free electrons roughly travel in a conducting metal lattice?	The opposite direction	67%
Semiconductors have almost filled valence bands. What are the two most common pure semiconductors?	Silicon	64%
	Germanium	61%
What are integrated circuits in computer chips made of?	Silicon	55%
What is the highest band occupied by electrons called?	The valence band	52%
What is the process of adding atoms with a different amount of valence electrons to a semiconductor?	Doping	48%
What do p-type semiconductors have more of?	Positive charge carriers	48%
What direction, relative to the conduction band's current, does this new positive current flow?	The opposite direction	48%
In semiconductors, what is the distance between the conduction and valence bands relative to insulators?	Small	42%
What are the simplest form of a valves called? (They only have two electrodes)	Diodes	39%
In an insulator, the valence band is full of electrons. Therefore the gap between the bands are _____.	Large	39%
In a conductor, what do the conduction and valence bands do?	Overlap	39%
What are the two most common dopant atoms? (one each for n-type and p-type)	Phosphorus	39%
Opposite of the above require the addition of dopant atoms. What are these semiconductors called?	Extrinsic semiconductors	36%
What were early diodes and transistors made from?	Germanium	36%
Silicon and Germanium do not need ^ to be a semiconductor. They are known as pure semiconductors. What is another name for them?	Intrinsic semiconductors	36%
	Boron	33%
Diodes can be made with semiconductors. In diodes, electrons travel away from what type of semiconductor?	N-type Semiconductors	30%
No two electrons in an atom can simultaneously occupy ___ ____ ______ _____.	The same energy state	27%
Due to its simplicity, ^'s unidirectional current means it is used for what simple function?	A switch	24%
It can also convert alternating current (AC) into direct current (DC). What is this called?	Rectification	24%
	Npn transistors	21%
Transistors are semiconductor devices that can act as a switch or as an amplifier. What are the two main types of transistor?	Pnp transistors	21%
To get to the other semiconductor, which is the other type, what zone do the electrons travel across?	The depletion zone	21%
What word descibes the free movement of electrons in a metal lattice?	Delocalised	18%
What do the electrons leave behind in the valence band?	Positive hole	18%
By being more reliable and allowing for miniturisation, transistors replaced which device in electronic devices?	Thermionic valves	18%
	Can be used in smaller devices	15%
What are ionically bonded molecules?	Insulators	15%
Lee de Forest added what to convert the simple valve into a current amplifier, or triode?	Another electrode	12%
As temperature increases, what does thermal energy allow electrons in the valence band to do?	Cross the gap	12%
What do thermionic devices use in glass vacuum tubes to control the flow of current.	Heated filaments	12%
Solid state devices encompass transistors and what other device?	Integrated circuits	12%
What did de Broglie proposed that electrons could also be considered as?	Standing waves	12%
What shape do groups of silicon atoms form in a diamond lattice structure?	Tetrahedrons	12%
What are the main benefits of solid state devices over thermionic devices?	They are smaller	12%
	Affected less by higher temperatures	9%
	Less fragile	9%
	Less heat produced	9%
	Longer lifetime	9%
	Lower voltage required	9%
	More reliable	9%
What is a transistor is a combination of?	two n-p junctions	9%
Integrated circuits are tiny electrical circuits used to perform specific electrical functions. What primarily is the issue with wiring that IC's reduce?	Variable resistance	9%
What were the main advantages of silicon solid state devices?	Very common in the Earth's crust	9%

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