The depletion layer width of Junction
A. Decreases with light doping
B. Is independent of applied voltage
C. Is increased under reverse bias
D. Increases with heavy doping
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An intrinsic silicon sample has 1 million free electrons at room temperature. As the temperature is increased
A. The number of free electrons increases
B. The number of free electrons increases but the number of holes decreases
C. The number of free electrons and holes increase by the same amount
D. The number of free electrons and holes increase but not by the same amount
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If too large current passes through the diode
A. All electrons will leave
B. All holes will freeze
C. Excessive heat may damage the diode
D. Diode will emit light
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Which of the following has highest resistivity?
A. Mica
B. Paraffin wax
C. Air
D. Mineral oil
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At room temperature the current in an intrinsic semiconductor is due to
A. Holes
B. Electrons
C. Ions
D. Holes and electrons
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A transistor has a current gain of 0.99 in the CB mode. Its current gain in the CC mode is
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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.
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true
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In a bipolar transistor, the base collector junction has
A. Forward bias
B. Reverse bias
C. Zero bias
D. Zero or forward bias
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Work function is the maximum energy required by the fastest electron at 0 K to escape from the metal surface.
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The output, V-I characteristics of an Enhancement type MOSFET has
A. Only an ohmic region
B. Only a saturation region
C. An ohmic region at low voltage value followed by a saturation region at higher voltages
D. An ohmic region at large voltage values preceded by a saturation region at lower voltages
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The amount of photoelectric emission current depends on
A. Frequency of incident radiation
B. Intensity of incident radiation
C. Both frequency and intensity of incident radiation
D. None of the above
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The sensitivity of human eyes is maximum at
A. White portion of spectrum
B. Green portion of spectrum
C. Red portion of spectrum
D. Violet portion of spectrum
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The sensitivity of human eyes is maximum at
A. White portion of spectrum
B. Green portion of spectrum
C. Red portion of spectrum
D. Violet portion of spectrum
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Which of the following could be the maximum current rating of junction diode by 126?
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Piezoelectric quartz crystal resonators find application where
A. Signal amplification is required
B. Rectification of the signal is required
C. Signal frequency control is required
D. Modulation of signal is required
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In the sale of diamonds the unit of weight is carat. One carat is equal to
A. 100 mg
B. 150 mg
C. 200 mg
D. 500 mg
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Forbidden energy gap in germanium at 0 K is about
A. 10 eV
B. 5 eV
C. 2 eV
D. 0.78 eV
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Assertion (A): A VMOS can handle much larger current than other field effect transistors. Reason (R): In a VMOS the conducting channel is very narrow.
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true
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In a semiconductor diode, the barrier offers opposition to
A. Holes in P-region only
B. Free electrons in N-region only
C. Majority carriers in both regions
D. Majority as well as minority carriers in both regions
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As compared to bipolar junction transistor, a FET
A. Is less noisy
B. Has better thermal stability
C. Has higher input resistance
D. All of the above
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