
PHYSICS CH8

Quiz
•
Physics
•
12th Grade
•
Medium
Abderahman Mohammed
Used 2+ times
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
a silicon crystal is doped with atoms of a pentavalent element, so the ratio between the concentrations of holes and that of free electrons at equilibrium is........
less than 1
greater than 1
equal to 1
equal to 0
2.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
if the emitter current in an npn transistor is 1.5 mA and the collector current is 1.45 mA so the base current equals......
2.95 mA
0.55 mA
0.6 mA
0.05 mA
3.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
the region which has the lowest concentration of electric charge carries in the transistor is.........
the base
the emitter
the collecter
the three regions have the same concentrations
4.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
the hole in a semiconductor has the same charge as........
a proton
an electron
a neutron
it depends of the type of the crystal
5.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
if two different chips, one of copper and the other of germanium, are cooled down from the room temperature to 80 K, so ......
their resistance increase
their resistance decrease
the resistance of copper increases while the resistance of germanium decreases
the resistance of copper decreases while the resistance of germanium increases
6.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
the binary number which is equivalent to the summation of the following decimal number (1+1+1+1) is.......
(1111)2
(101)2
(110)2
(100)2
7.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
the n-type semiconductor crystal is......
negatively charged
neutral
positively charged
an insulator
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