PIS - Unit 2 - Semiconductor Physics - Quiz 1

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

• 2

• 3

• 6

• 4

The forbiddenn energy gap for Germanium is of the order of

• (a) 0.7 eV

• (b) 0.3 eV

• (c) 1.1 eV

• (d) 10 eV

Doping of Semiconductors

• materials which can conduct electricity better than insulator, but not as well as conductors.

• The process of adding of a certain amount of specific impurities atoms in the pure semiconductor.

• when 4 electrons in outermost orbit.

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

• Doping

• Ionization

• Recombination

• Atomic modification

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

An n type semiconductor is negatively charged

• True

• False

The forbidden energy gap for Silicon is of the order of

• 0.7 eV

• 0.3 eV

• 1.1 eV

• 10 eV

Who contribute to the current in a semiconductor

• electrons only

• holes only

• negative ions

• both electrons and holes

At room temperature, an intrinsic semiconductor has ……….

• Many holes only

• A few free electrons and holes

• Many free electrons only

• No holes or free electrons