Mod 4 Complete revision

Which term best describes semiconductor materials in relation to conductors and insulators?

• Conductors
• Insulators
• Intermediate between conductor and insulator

In what state do semiconductors conduct electricity as opposed to thermionic devices?

• Gaseous state
• Solid state
• Liquid state

Which band corresponds to the energy levels of free electrons?

• Valence band
• Nucleus
• Conduction band

When electrons are freed from orbit at certain energy levels, what are they called?

• Valence electrons
• Free electrons
• Neutrons

What bonding type is present in intrinsic semiconductors like pure silicon and germanium?

• Ionic bonds
• Metallic bonds
• Covalent bonds

What term is used to describe pure silicon and germanium in their natural, unmodified states?

• Extrinsic semiconductors
• Intrinsic semiconductors
• Metallic semiconductors

In a P-doped semiconductor, what is the primary result of doping with a trivalent atom like indium?

• Extra electrons
• Free neutrons
• Creation of holes

What is the primary function of adding impurities to intrinsic semiconductors?

• To increase the band gap
• To control conductivity
• To neutralize the material

Which material is commonly used in semiconductors due to its electrical characteristics?

• Copper
• Gallium
• Iron

In a pure silicon atom, why is it considered an insulator?

• Electrons are easily detached
• Valence electrons are rigidly held by covalent bonds
• No positive charge carriers are present