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Quiz 2
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Q.1
Power diodes are generally
Silicon diodes
Germanium diodes
Either of the above
None of the above
Q.2
Silicon is not suitable for fabrication of light emitting diodes because it is
An indirect band gap semiconductor
Direct band gap semiconductor
Wideband gap semiconductor
Narrowband gap semiconductor
Q.3
In a bipolar transistor, the base collector junction has
Forward bias
Reverse bias
Zero bias
Zero or forward bias
Q.4
Work function is the maximum energy required by the fastest electron at 0 K to escape from the metal surface.
True
False
Q.5
The output, V-I characteristics of an Enhancement type MOSFET has
Only an ohmic region
Only a saturation region
An ohmic region at low voltage value followed by a saturation region at higher voltages
An ohmic region at large voltage values preceded by a saturation region at lower voltages
Q.6
If too large current passes through the diode
All electrons will leave
All holes will freeze
Excessive heat may damage the diode
Diode will emit light
Q.7
Which of the following has highest resistivity?
Mica
Paraffin wax
Air
Mineral oil
Q.8
At room temperature the current in an intrinsic semiconductor is due to
Holes
Electrons
Ions
Holes and electrons
Q.9
The sensitivity of human eyes is maximum at
White portion of spectrum
Green portion of spectrum
Red portion of spectrum
Violet portion of spectrum
Q.10
Which of the following could be the maximum current rating of junction diode by 126?
1 A
10 A
20 A
100 A
Q.11
Assertion (A): In p-n-p transistor collector current is termed negative.
Reason (R): In p-n-p transistor holes are majority carriers.
Both A and R are true and R is correct explanation of A
Both A and R are true but R is not a correct explanation of A
A is true but R is false
A is false but R is true
Q.12
How many free electrons does a p type semiconductor has?
Only those produced by thermal energy
Only those produced by doping
Those produced by doping as well as thermal energy
Any of the above
Q.13
When avalanche breakdown occurs covalent bonds are not affected.
True
False
Q.14
Which variety of copper has the best conductivity?
Pure annealed copper
Hard drawn copper
Induction hardened copper
Copper containing traces of silicon
Q.15
What is the necessary a.c. input power from the transformer secondary used in a half wave rectifier to deliver 500 W of d.c. power to the load?
1232 W
848 W
616 W
308 W
Q.16
A thermistor is a
Thermocouple
Thermometer
Miniature resistance
Heat sensitive explosive
Q.17
Piezoelectric quartz crystal resonators find application where
Signal amplification is required
Rectification of the signal is required
Signal frequency control is required
Modulation of signal is required
Q.18
Light dependent resistors are
Highly doped semiconductor
Intrinsic semiconductor
Lightly doped semiconductor
Either A or B
Q.19
In a bipolar transistor, the emitter base junction has
Forward bias
Reverse bias
Zero bias
Zero or reverse bias
Q.20
Free electrons exist in
First band
Second band
Third band
Conduction band
0 h : 0 m : 1 s
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