Chapter 18(Electronics)

The semiconductors doped with pentavalent elements are called:

• n-type substances

• p-type substances

• Both

• None

The semiconductors doped with trivalent elements are called:

• n-type substances

• p-type substances

• Both

• None

The electric resistance of a semiconductor diode when it is forward biased is very:

• High

• Low

• Fast

• All of them

The impurities are called accepter impurities of Group:

• II

• III

• IV

• V

The impurities are called donor impurities of Group:

• II

• III

• IV

• V

In which type of material, holes are the charge carrier:

• n-type substances

• p-type substances

• Both

• None

In which type of material, electrons are the charge carrier:

• n-type substances

• p-type substances

• Both

• None

PN junction diode behaves as a:

• Rectifier

• Moderator

• Transistor

• Amplifier

The materials in which electric current can flow easily due to their low resistance are called:

• Insulators

• Conductors

• Semi conductor

• Moderator

If temperature is increased, the electric resistance of a semi conductor:

• Decreases

• Increases

• Remains same

• Does not change