12th Class Physics MCQS
The P.D develop in case of germanium is:
0.3
0.7
0.5
0.9
The chargeless region after formation of Pn junction is called:
Field region
Depletion region
Free region
U.V region
The average gap for Germanium at 0K is
7.2 ev
6.72 ev
1.12 ev
0.02 ev
The impurity in the germinium is usually in the ratio of
1:108
1:106
1:104
1:1010
Transistor was invented by:
Bardeen
Newton
Lenz
Micheal faraday
The semi conductor diode has the property of
One way conduction
Zero conduction
Two way conduction
Amplification
Photodiode is used for:
Detection of current
Detection of heat
Detection of light
Both a & b
In a transistor, collector current is controlled by:
All of the above
Collector resistance
Base current
Collector voltage
Improper bisting of a transistor circiut produces:
Excessive heat at collector terminal
Heavy loading of emitter current
Distortion in the output output signal
Faculty location of load line
The reverse saturation current in a PN junction diode is only due to:
Donor ions
Majority carriers
Acceptor ions
Minoritycarriers
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