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.2.
Which of the following could be the maximum current rating of junction diode by 126?
1 A
10 A
20 A
100 A
Q.3.
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.4.
The amount of photoelectric emission current depends on
Frequency of incident radiation
Intensity of incident radiation
Both frequency and intensity of incident radiation
None of the above
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.
In a bipolar transistor, the base collector junction has
Forward bias
Reverse bias
Zero bias
Zero or forward bias
Q.7.
Assertion (A): A p-n junction has high resistance in reverse direction.Reason (R): When a reverse bias is applied to p-n junction, the width of depletion layer increases.
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.8.
A transistor has a current gain of 0.in the CB mode. Its current gain in the CC mode is
100
99
1.01
0.99
Q.9.
Which of the following has highest resistivity?
Mica
Paraffin wax
Air
Mineral oil
Q.10.
At room temperature the current in an intrinsic semiconductor is due to
Holes
Electrons
Ions
Holes and electrons
Q.11.
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.12.
An intrinsic silicon sample has 1 million free electrons at room temperature. As the temperature is increased
The number of free electrons increases
The number of free electrons increases but the number of holes decreases
The number of free electrons and holes increase by the same amount
The number of free electrons and holes increase but not by the same amount
Q.13.
The depletion layer width of Junction
Decreases with light doping
Is independent of applied voltage
Is increased under reverse bias
Increases with heavy doping
Q.14.
In a half wave rectifier, the load current flows
Only for the positive half cycle of the input signal
Only for the negative half cycle of the input signal
For full cycle
For less than fourth cycle
Q.15.
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.16.
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.17.
Light dependent resistors are
Highly doped semiconductor
Intrinsic semiconductor
Lightly doped semiconductor
Either A or B
Q.18.
In a bipolar transistor, the emitter base junction has
Forward bias
Reverse bias
Zero bias
Zero or reverse bias
Q.19.
Free electrons exist in
First band
Second band
Third band
Conduction band
Q.20.
When avalanche breakdown occurs covalent bonds are not affected.
True
False
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