Semiconductor Physics and Diodes MCQs

Question 1

Conduction electrons have more mobility than holes because they

Accepted Answer

need less energy to move them

Answer

are lighter

Answer

experience collisions less frequently

Answer

have negative charge

Question 2

Doping materials are called impurities because they

Accepted Answer

alter the crystal structures of the pure semiconductors

Answer

decrease the number of charge carriers

Answer

change the chemical properties of semiconductors

Answer

make semiconductors less than 100 percent pure

Question 3

Current flow in a semiconductor depends on the phenomenon of

Accepted Answer

all of the above

Answer

drift

Answer

diffusion

Answer

recombination

Question 4

The process of adding impurities to a pure semiconductor is called

Accepted Answer

doping

Answer

mixing

Answer

diffusing

Answer

refining

Question 5

The most widely used semiconucting material in electronic devices is

Accepted Answer

silicon

Answer

germanium

Answer

copper

Answer

carbon

Question 6

Electon-hole pairs are produced by

Accepted Answer

thermal energy

Answer

recombination

Answer

ionization

Answer

doping

Question 7

Recombination takes place when

Accepted Answer

an electron falls into a hole

Answer

a positive and a negative ion bond together

Answer

a valence electron becomes a conduction

Answer

a crystal is formed

Question 8

When a P-N junction is formed, diffusion current causes

Accepted Answer

barrier potential

Answer

mixing of current carriers

Answer

forward bias

Answer

reverse bias

Question 9

The leakage current of a P-N diode is caused by

Accepted Answer

heat energy

Answer

chemical energy

Answer

barrier potential

Answer

majority carriers