Solid State Physics II - SS3 Physics Past Questions and Answers - page 2
Which of the following materials has the highest electrical conductivity?
Copper
Silver
Gold
Aluminum
Which of the following materials has the highest resistivity?
Silver
Copper
Gold
Tungsten
What are conductors?
Conductors are materials that allow the flow of electric charge easily. They have high electrical conductivity and low resistance. Metals are examples of conductors.
What are insulators?
Insulators have very low electrical conductivity and high resistance. They have a wide band gap between the valence band and the conduction band, which means that electrons are not able to move easily from the valence band to the conduction band. Examples of insulators include rubber, glass, and plastics.
What is the main function of a diode in a circuit?
To amplify the current
To regulate the voltage
To rectify the current
To increase the resistance
Which of the following is NOT a type of transistor?
Bipolar junction transistor (BJT)
Field-effect transistor (FET)
Metal-oxide-semiconductor field-effect transistor (MOSFET)
Capacitive junction transistor (CJT)
What is the main difference between a diode and a transistor?
A diode has only one semiconductor material while a transistor has two.
A diode can only conduct current in one direction while a transistor can conduct in both.
A transistor can only amplify a signal while a diode cannot.
A diode can only be used as a switch while a transistor can be used as both a switch and an amplifier.
Which of the following statements is true about a P-N junction in a diode?
The P-type material has an excess of electrons, while the N-type material has a deficiency of electrons.
The P-type material has a deficiency of electrons, while the N-type material has an excess of electrons.
Both the P-type and N-type materials have an excess of electrons.
Both the P-type and N-type materials have a deficiency of electrons.
What is a diode?
A diode is a two-terminal electronic component that conducts electric current in only one direction. It has a p-n junction, which is formed by doping one side of a semiconductor crystal with impurities that create a surplus of electrons (n-type) and the other side with impurities that create a deficiency of electrons (p-type).
What is a transistor?
A transistor is a three-terminal electronic device that can amplify or switch electronic signals. It consists of a sandwich of p-type and n-type semiconducting materials, with two junctions between them. The three terminals are called the emitter, base, and collector.