Semiconductor Physics

What is a PN junction?

• A semiconductor junction formed between a P-type semiconductor and an N-type semiconductor

• A type of chemical reaction junction

• A type of electrical transformer junction

• A type of computer network junction

Explain the working principle of a transistor.

• A transistor converts sound waves into electrical signals

• A transistor controls current flow between two terminals based on voltage applied to a third terminal.

• A transistor emits light when activated

• A transistor regulates temperature within a circuit

What are the characteristics of a diode?

• Conducts current primarily in one direction, high resistance in the other direction, non-linear current-voltage characteristics

• Linear current-voltage characteristics

• Low resistance in both directions

• Conducts current in both directions

Name two common semiconductor materials.

• Carbon and Oxygen

• Aluminum and Copper

• Silicon and Germanium

• Gold and Silver

How does conductivity occur in semiconductors?

• Conductivity occurs due to gravitational forces

• Semiconductors conduct electricity through sound waves

• Conductivity in semiconductors is a result of magnetic fields

• Movement of charge carriers facilitated by impurities or dopants

What happens when a PN junction is forward biased?

• No current flows through the junction

• Current flows through the junction

• Voltage decreases across the junction

• Resistance of the junction increases

Define the term 'hole' in semiconductors.

• A 'hole' in semiconductors refers to the absence of an electron in a filled electron state, behaving as a positive charge carrier.

• A 'hole' in semiconductors refers to the presence of an electron in an empty electron state.

• A 'hole' in semiconductors is a type of electronic device used for data storage.

• A 'hole' in semiconductors is a physical opening in the material structure.

What is the function of a base in a transistor?

• Store data

• Generate heat

• Control current flow

• Amplify sound

Describe the band gap in semiconductor materials.

• Band gap in semiconductor materials is the energy difference between the valence band and the conduction band.

• Band gap refers to the physical width of the semiconductor material.

• Band gap is the temperature range where the material is most conductive.

• Band gap is the number of bands present in the material.

How does doping affect the conductivity of semiconductors?

• Doping has no effect on the conductivity of semiconductors.

• Doping changes the color of semiconductors but does not affect conductivity.

• Doping decreases the conductivity of semiconductors by removing charge carriers.

• Doping increases the conductivity of semiconductors by introducing more charge carriers.