Semiconductor Materials

A semiconductor has generally ……………… valence electrons.

• 2

• 3

• 6

• 4

Which of the following is a pentavalent impuity added while forming an extrinsic semiconductor ?

• Boron

• Arsenic

• Indium

• Gallium

The process of adding an impurity to an intrinsic semiconductor is called

• Doping

• Ionization

• Recombination

• Atomic modification

The minority carriers in P-type silicon are called _________________

• Neutron

• Proton

• Electron

• Hole

Which is NOT one of the properties of semiconductor?

• 4 electrons in outermost orbit, in covalent bonding.

• atoms vibrate causes electron to break free from the bonds.

• Electron free leaves hole.

• Semiconductor has 2 types of charge carriers.

• all of the above are the properties of it

Which among these is NOT a semiconductor

• Germanium

• Silicon

• Gallium Arsenide

• Titanium

Electrons and holes are equal in magnitude but opposite in polarity

• True

• False

Who contribute to the current in a semiconductor

• electrons only

• holes only

• negative ions

• both electrons and holes

When a pentavalent impurity is added to a pure semiconductor, it becomes ………

• An insulator

• An intrinsic semiconductor

• p-type semiconductor

• n-type semiconductor

Addition of trivalent impurity to a semiconductor creates many ……..

• Holes

• Free electrons

• Valence electrons

• Bound electrons