Physics and Electronics Quiz

How does a P-N junction in a photodetector respond to light exposure?

• It causes a decrease in the electrical conductivity of the material.

• It blocks the flow of current entirely.

• It emits light as a result of recombination of electrons and holes.

• It increases current flow due to electron-hole pair generation when exposed to light.

During the fabrication of a MOSFET, etching is used to:

• Diffuse dopants into the source and drain regions

• Create the channel by forming a conductive layer

• Remove unwanted regions of the gate oxide or polysilicon

• Deposit thin films of semiconductor material

Which of the following is a common use of laser diodes in optoelectronics?

• Photographic film processing

• Optical disc readers

• Solar energy harvesting

• Electric power generation

Kirchhoff's Voltage Law (KVL) states that:

• Voltage and current are inversely proportional.

• Power is conserved in a circuit.

• The total resistance in a circuit is constant.

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

What is the role of the inductor in an RL circuit?

• It increases voltage.

• It reduces power loss.

• It resists changes in current.

• It resists changes in voltage.

A Field-Effect Transistor (FET) is a semiconductor device whose operation depends on:

• Control of current by a thermal field.

• Control of current by a magnetic field.

• Control of current by a light source.

• Control of current by an electric field.

How is the capacitance of a P-N junction related to the width of the depletion region?

• Capacitance increases as the width of the depletion region increases.

• Capacitance decreases as the width of the depletion region increases.

• Capacitance is directly proportional to the depletion region width.

• Capacitance is unaffected by the width of the depletion region.

Neutral atom loses an electron, it becomes:

• Nuclei

• A positive ion, or Cation

• A negative ion, or Anion

• Free electron

What is ionization energy?

• The maximum energy needed to remove an electron from an atom of the element.

• The maximum energy needed to add an electron to an atom of the element.

• The minimum energy needed to add an electron to an atom of the element.

• The minimum energy needed to remove an electron from an atom of the element.

Neutral atom gains an electron, it becomes:

• A positive ion, or Cation

• Nuclei

• Free electron

• A negative ion, or Anion