Band Gap

What is PN junction diode?

• A p-n junction diode is two-terminal or two-electrode semiconductor device, which allows the electric current in only one direction while blocks the electric current in opposite or reverse direction.

• A p-n junction diode is two-terminal or two-electrode semiconductor device, which allows the electric current in both the directions.

• A p-n junction diode is single -terminal semiconductor device, which allows the flow of current in reverse biasing.

For a PN junction diode, the current in reverse bias may be

• Few miliamperes

• Between 0.2 A and 15 A

• Few amperes

• Few micro or nano amperes

The capacitance of a reverse biased PN junction

• Increases as reverse bias is increased

• Decreases as reverse bias is increased

• Increases as reverse bias is decreased

• Is insignificantly low

When PN junction is in forward bias, by increasing the battery voltage

• Circuit resistance increases

• Current through P-N junction increases

• Current through P-N junction decreases

• None of the above happens

When a PN junction is reverse-biased

• Holes and electrons tend to concentrate towards the junction

• The barrier tends to break down

• Holes and electrons tend to move away from the junction

• None of the above

A PN junction is said to be forward biased when

• Positive terminal of the battery is connected to P-side and the negative side to the N-side

• Junction is earthed

• N-side is connected directly to the p-side

• Positive terminal of the battery is connected to N-side and the negative side to the P-side

A PN junction

• Has low resistance in forward as well as reverse directions

• Has high resistance in forward as well as reverse directions

• Conducts in forward direction only

• Conducts in reverse direction only

When a PN junction is forward biased

• Holes as well as electrons tend to drift away from the junction

• The depletion region decreases

• The barrier tends to breakdown

• None of the above

In a reverse biased PN junction, the current through the junction increases abruptly at

• 0.5 V

• 1.1 V

• 0.72 V

• Breakdown voltage

The resistivity of a semiconductor ____________ conductors and insulators

• More than that of

• Lies between that of

• Less than that of

• None of the above