Semiconductor and Circuit Quiz

In a semiconductor, what is the role of the valence band?

• It lies above the conduction band and is responsible for electrical conductivity.

• It contains electrons that are free to move and conduct electricity.

• It is the highest energy band that is completely empty at absolute zero temperature.

• It is the band where electrons are bound to atoms but can jump to the conduction band when energy is supplied.

A charged conductor in electrostatic equilibrium has:

• A non-zero charge density inside the conductor

• Electric field proportional to the distance from the center

• Electric field lines passing through it

• No electric field inside the conductor

Kirchhoff's Voltage Law (KVL) states that:

• Power is conserved in a circuit.

• The sum of all voltages around a closed loop is zero.

• Voltage and current are inversely proportional.

• The total resistance in a circuit is constant.

A scientist measures the distance from Earth to the Moon using which unit?

• Centimeter

• Meter

• Kilometer

• Millimeter

The CMOS OR gate consists of how many transistors in total?

• 6

• 8

• 2

• 4

If the distance between two charged particles is doubled, the strength of the electric force between them will?

• Be quartered

• Be halved

• Remain unchanged

• Double

In the cut-off mode of a BJT, the transistor behaves like:

• A closed switch.

• A high-gain amplifier.

• A current regulator.

• An open switch.

In which application is a P-N junction used to convert light energy into electrical energy?

• Solar cell

• All of the above

• Photodiode

• Light-emitting diode (LED)

Which of the following factors affects the capacitance of a capacitor?

• The electric current flowing through it.

• Voltage across the capacitor.

• Area of the plates and the distance between them.

• Charge stored on the plates.

In the fabrication of MOSFETs, the substrate doping determines the type of MOSFET. Which doping type would be used for an n-channel MOSFET?

• p-type doping

• n-type doping

• Undoped (intrinsic) silicon

• Both n-type and p-type doping