Grade 1 Physics Quiz: PN Junction Diode

What is the structure of a PN junction diode?

• Conductor and insulator

• Positive charge and negative charge

• P-type semiconductor and N-type semiconductor

• Cathode and anode

How does a PN junction diode operate?

• It allows current to flow in one direction and blocks it in the opposite direction.

• It has no effect on the flow of current

• It only allows current to flow in the opposite direction

• It allows current to flow in both directions

What are the V-I characteristics of a PN junction diode?

• Exponential increase in current with forward bias and almost zero current with reverse bias

• No change in current with forward bias and almost zero current with reverse bias

• Exponential decrease in current with forward bias and almost zero current with reverse bias

• Linear increase in current with forward bias and almost zero current with reverse bias

What are the materials used in the structure of a PN junction diode?

• Semiconductor materials

• Rubber and paper

• Plastic and glass

• Wood and metal

Explain the process of forward biasing in a PN junction diode.

• Reducing the depletion layer and allowing current to flow

• Introducing resistance to stop the flow of current

• Increasing the depletion layer and preventing current flow

• Creating a magnetic field to block the flow of electrons

What happens to the current flow in a PN junction diode when it is reverse biased?

• Current flow remains the same

• Current flow becomes erratic

• Current flow decreases

• Current flow increases

Describe the relationship between voltage and current in a PN junction diode.

• Linear

• Exponential

• Constant

• Non-linear

What is the significance of the knee voltage in the V-I characteristics of a PN junction diode?

• It indicates the threshold voltage for the diode to start conducting.

• It measures the temperature of the diode

• It indicates the speed of the electrons in the diode

• It determines the color of the light emitted by the diode

Explain the concept of breakdown voltage in a PN junction diode.

• The breakdown voltage is the voltage at which the diode stops conducting in the forward bias direction.

• The breakdown voltage is the voltage at which the diode becomes a perfect insulator.

• The breakdown voltage is the voltage at which the diode emits light.

• The breakdown voltage is the voltage at which the diode starts conducting in the reverse bias direction.