AVIO 2010 - Quiz 3

What do we call the outermost electron shell of an atom that governs how the atom participates in chemical reactions?

• Valence shell
• Electron cloud
• Inner shell
• Core shell

Most inorganic substances form atoms or ions into an ordered array known as a _______.

• solution
• compound
• crystal structure

• molecule

What do we call the process of adding an impurity to a pure semiconductor to increase its conductivity?

• Conductivity enhancement
• Semiconductor purification
• Impurity removal
• Doping

What do we refer to dopants with 3 electrons in the outer shell (i.e., Boron or Gallium) added to semiconductor material?

• Neutral

• Acceptor

• Intrinsic

• Donor

How do semiconductors act extremely low temperatures (near absolute zero)?

• Insulators

• Diodes

• Semiconductors

• Conductors

Near the junction of a semiconductor crystal manufactured with P-type material at one end and N-type material at the other, what net charge does the P-type material take?

• Net negative charge
• Neutral charge
• Variable charge

A diode is said to be unidirectional device. What does this mean?

• double current flow

• no current flow

• current to flow in both directions.

• current flow in one direction

What do we call a bipolar semiconductor device with 4 or more alternating P-N layers?

• Transistor
• Diode
• Resistor
• Thyristor

What can be used to control a transistor?

• Magnetic fields generated by nearby devices.
• Mechanical pressure applied to the transistor.
• Voltage or Current

• Temperature changes in the environment.

What must an amplifier have in order to produce an output with more power than its input?

• no power source

• a cooling system to manage heat.

• internal power source

• external power source