Chapter 1 quiz

An intrinsic semiconductor, at the absolute zero temperature, behaves like which one of the following?

• Insulator

• Superconductor

• n-type semiconductor

• p-type semiconductor

Which of the following statements is not true?

• The resistance of intrinsic semiconductor decreases with the increase of temperature

• Doping pure Si with trivalent impurities gives p-type semiconductors

• The majority carriers in n-type semiconductors are holes

• A p-n junction can act as a semiconductor diode

Which of the following, when added as an impurity, into the silicon, produces n-type semiconductor?

• Phosphorous

• Aluminum

• Magnesium

• Sulfur

In n-type semiconductors, which one is the majority charge carriers?

• Holes

• Protons

• Neutrons

• Electrons

A small impurity is added to germanium to get a p-type semiconductor. Identify the impurity?

• Bivalent substance

• Trivalent substance

• Pentavalent substance

• Monovalent substance

N-type of extrinsic semiconductor is formed by adding a _______ impurity.

• trivalent

• hexavalent

• bivalent

• pentavalent

What is the layer called, when majority carriers of both the parts of the diode accumulate at the junction the layer?

• Diffusion Layer

• Combination Layer

• Heterojunction Layer

• Depletion Layer

The energy band gap is maximum in which of the following?

• Metals

• Superconductors

• Insulators

• Semiconductors

Current carrier in conductors is ____

• Electron

• Proton

• Neutron

• Positron

Identify the type of materials which develop electric currents in them, when an electric field is applied.

• Elastomers

• Conductors

• Insulators

• Polymers