multipule choice questions on semiconductor

2. 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

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

• (a) Boron 
• Arsenic
• Indium
• Gallium

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.

conductivity of semiconductor increases with increase in temperature, because

• number density of free charge carriers increases

• relaxation time increases

• both number density of free charge carriers and relaxation time increases

• number density of free charge carriers increases relaxation time decreases but effect of decrease in relaxation time is much less than increase in number density

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

• 2

• 3

• 6

• 4

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

Name this electronic component

• Capacitor
• Fixed Resistor
• Potentiometer
• Transistor

LED is

• Light Enhancing Diode

• Light Emitting Diode

• Light Emitting Detector

• Light Enhancing Detector

What is the most common semiconductor material used for producing integrated circuits

• Quartz

• Silicon

• Diamond

• Tantalum