JEE Questions for Physics Semiconductor Devices Quiz 4 - MCQExams.com

If De, Db , and Dc are the doping levels of emitter, base and collector respectively of a transistor, then
  • De = Db = Dc
  • De < Db = Dc
  • De > Db > Dc
  • De < Db < Dc
  • De > Dc > Db
By increasing the temperature, the specific resistance of a conductor and a semiconductor
  • increases for both
  • decreases for both
  • increases, decreases respectively
  • decreases, increases respectively
For the given digital circuit, write the truth table and identify the logic gate it represents
Physics-Semiconductor Devices-87482.png
  • OR gate
  • NOR gate
  • NAND gate
  • AND gate
The inputs and outputs for different time intervals are given below the NAND gate is
Physics-Semiconductor Devices-87484.png
  • 1, 1, 1, 0
  • 0, 1, 0, 1
  • 0, 1, 0, 0
  • 1, 0, 1, 1
The given below truth table shows
Physics-Semiconductor Devices-87485.png
  • XOR gate
  • NAND gate
  • OR gate
  • AND gate
The output of an OR gate is connected to both the inputs of a NAND gate. The combination will serve as a
  • OR gate
  • NOT gate
  • NOR gate
  • AND gate
Which type of gate the following truth table represents?
Physics-Semiconductor Devices-87487.png
  • NOT
  • AND
  • OR
  • NAND
To get an output 1 from the circuit shown in the figure, the input must be
Physics-Semiconductor Devices-87489.png
  • A = 0, B = 1, C = 0
  • A = 1, B = 0, C = 0
  • A = 1, B = 0, C = 1
  • A = 1, B = 1, C = 0
The logic circuit shown below has the input waveforms A and B as shown. Pick out the correct output waveform.
Physics-Semiconductor Devices-87490.png

  • Physics-Semiconductor Devices-87491.png
  • 2)
    Physics-Semiconductor Devices-87492.png

  • Physics-Semiconductor Devices-87493.png

  • Physics-Semiconductor Devices-87494.png
The Binary Coded Decimal (BCD) equivalent of 429 is
  • 111001110
  • 01000010100
  • 110101101
  • 0100101001
In the following combinations of logic gates, the outputs of A, B and C are respectively
Physics-Semiconductor Devices-87495.png
  • 0, 1, 1
  • 0, 1, 0
  • 1, 1, 0
  • 1, 0, 1
The truth table for the following logic circuit is
Physics-Semiconductor Devices-87496.png

  • Physics-Semiconductor Devices-87497.png
  • 2)
    Physics-Semiconductor Devices-87498.png

  • Physics-Semiconductor Devices-87499.png

  • Physics-Semiconductor Devices-87500.png

  • Physics-Semiconductor Devices-87501.png
The diagram of a logic circuit is given below. The output F of the circuit is given by
Physics-Semiconductor Devices-87502.png

  • Physics-Semiconductor Devices-87503.png
  • 2)
    Physics-Semiconductor Devices-87504.png

  • Physics-Semiconductor Devices-87505.png

  • Physics-Semiconductor Devices-87506.png
The following logic circuit represents
Physics-Semiconductor Devices-87507.png

  • Physics-Semiconductor Devices-87508.png
  • 2)
    Physics-Semiconductor Devices-87509.png

  • Physics-Semiconductor Devices-87510.png

  • Physics-Semiconductor Devices-87511.png
In the adjacent circuit, A and B represent two inputs and Y represent the output. The circuit represents
Physics-Semiconductor Devices-87513.png
  • NOR gate
  • AND gate
  • NAND gate
  • OR gate
Identify the true statement for OR gate
  • Output Y will be 1 when input A or B or both are 1
  • Output Ywill be 0 when the either of the inputs A or B is 1
  • Output Y will be 1 only when both the inputs A and B are 1
  • Output Y will be 1 only when either of the inputs A and B are 1
To get an output Y = 1 from the circuit shown, the inputs A, B and C must be respectively
Physics-Semiconductor Devices-87514.png
  • 0, 1, 0
  • 1, 0, 0
  • 1, 0, 1
  • 1, 1, 0
The combination of the following gates produces
Physics-Semiconductor Devices-87516.png
  • AND gate
  • NAND gate
  • NOR gate
  • OR gate
  • NOT gate
Identify the logic gate from the following truth table.
Physics-Semiconductor Devices-87517.png
  • NOR gate
  • NOT gate
  • AND gate
  • NAND gate
The truth table given below is for (A and B are the inputs, Y is the output)
Physics-Semiconductor Devices-87518.png
  • NOR
  • AND
  • XOR
  • NAND
The time variations of signals are given as in A, B and C.Point out the true statement from the
Physics-Semiconductor Devices-87519.png
  • A, B and C are analogue signals
  • A and B are analogue, but C is digital signal
  • A and C are analogue but B is digital signal
  • A, B and C are digital signals
Sum of the two binary numbers (100010)2 and (11011)2 is
  • (111111)2
  • (101111)2
  • (111001)2
  • (111101)2
Output W is given by
Physics-Semiconductor Devices-87520.png

  • Physics-Semiconductor Devices-87521.png
  • 2)
    Physics-Semiconductor Devices-87522.png

  • Physics-Semiconductor Devices-87523.png

  • Physics-Semiconductor Devices-87524.png
The inputs and outputs for different time intervals are given below the NAND gate.
Physics-Semiconductor Devices-87525.png
  • 1, 1, 1, 0
  • 0, 1, 0, 1
  • 0, 1, 0, 0
  • 1, 0, 1, 1
  • 1, 0, 1, 0
A logic gate and its truth table are shown below.
Physics-Semiconductor Devices-87527.png
  • NOR
  • AND
  • OR
  • NOT
A logic gate having two inputs A and B and output C has the following truth table.
Physics-Semiconductor Devices-87528.png
  • an OR gate
  • an AND gate
  • a NOR gate
  • a NAND gate
The output wave form of full-wave rectifier is

  • Physics-Semiconductor Devices-87529.png
  • 2)
    Physics-Semiconductor Devices-87530.png

  • Physics-Semiconductor Devices-87531.png

  • Physics-Semiconductor Devices-87532.png
The work function of oxide coated tungsten metal will be
  • 0.5 eV
  • 1.0 eV
  • 2.6 eV
  • 4.5 eV
In the characteristic curve of diode valve, the region where the value of plate current depends only on plate voltage is said to be
  • space charge limited region
  • temperature limited region
  • saturation current region
  • all of the above
The following graph shows, the characteristic curve of a thermionic diode, then the space charge limited current portion will be
Physics-Semiconductor Devices-87533.png
  • OP
  • OQ
  • PQ
  • QT
Child’s law is

  • Physics-Semiconductor Devices-87534.png
  • 2)
    Physics-Semiconductor Devices-87535.png

  • Physics-Semiconductor Devices-87536.png

  • Physics-Semiconductor Devices-87537.png
The voltage gain of triode amplifier is 30 and input voltage is Vi = sin 100πt, then output voltage will be
  • 30 sin 100πt
  • sin 100πt
  • – 30 sin 100πt
  • – sin 100πt
If lattice parameter for a crystalline structure is 3.6 Å, then atomic radius in fcc crystal in Å is
  • 7.20
  • 1.80
  • 1.27
  • 2.90
In a p-type semiconductor the acceptor level is situated 60 meV above the valence band. The maximum wavelength of light required to produce a hole will be
  • 0.207 × 10–5 m
  • 2.07 × 10–5 m
  • 20.7 × 10–5 m
  • 2075 × 10–5 m
In insulators
  • the valence band is partially filled with electrons
  • the conduction band is partially filled with electrons
  • the conduction band is filled with electrons and valence band is empty
  • the conduction band is empty and the valence band is filled with electrons
If a semiconductor has an intrinsic carrier concentration of 1.41 × 1016 /m3 when doped with 1021/m3 phosphorus atoms, then the concentration of holes/m3 at room temperature will be
  • 2 × 1021
  • 2 × 1011
  • 1.41 × 1010
  • 1.41 × 1016
Ripple factor of full wave rectifier is
  • 0.48
  • 4.7
  • 12.1
  • 1.21
In which of the following fig., the junction diode is reverse biased?

  • Physics-Semiconductor Devices-87541.png
  • 2)
    Physics-Semiconductor Devices-87542.png

  • Physics-Semiconductor Devices-87543.png

  • Physics-Semiconductor Devices-87544.png
In a junction diode, the direction of diffusion current is
  • from n-region to p-region
  • from p-region to n-region
  • from n-region to p-region if the junction is forward biased and vice versa if it is reverse biased
  • from p-region to n-region if the junction is forward biased and vice versa if it is reversed biased
The r.m.s value of output current in a half wave rectifier is
  • I0/π
  • I0/2
  • I0/√2
  • 2I0
The value of current in the following diagram (fig) will be
Physics-Semiconductor Devices-87545.png
  • 0 amp
  • 10-2 amp
  • 10 amp
  • 0.025 amp
In case of a p-n junction diode at high value of reverse bias, the current rises sharply. The value of reverse bias is known as
  • cut off voltages
  • zener voltage
  • inverse voltage
  • critical voltage
The depletion layer in silicon diode is 1 μ m wide and the knee potential is 0.6 V, then the electric field in the depletion layer will be
  • zero
  • 0.6 V m–1
  • 6 × 104 V/m
  • 6 × 105 V/m
Consider the junction diode is ideal. The value of current in the Fig.
Physics-Semiconductor Devices-87548.png
  • 0 A
  • 10–1 A
  • 10–2 A
  • 10–3 A
Transistor parameters
  • never change
  • are not same even for transistors of the same type
  • always change
  • are always same
The relationship between α and β is given by
  • α = β
  • 2)
    Physics-Semiconductor Devices-87549.png

  • Physics-Semiconductor Devices-87550.png

  • Physics-Semiconductor Devices-87551.png
In a common emitter transistor amplifier β = 60, R0 = 5000Ω and internal resistance of a transistor is 500 Ω. The voltage amplification of amplifier will be
  • 500
  • 460
  • 600
  • 560
For a common base amplifier, the values of resistance gain and voltage gain are 3000 and 2800 respectively. The current gain will be
  • 1.1
  • 0.98
  • 0.93
  • 0.83
In a common base transistor circuit, the current gain is 0.98. On changing emitter current by 5.00 mA, the change in collector current is
  • 0.196 mA
  • 2.45 mA
  • 4.9 mA
  • 5.1 mA
For a transistor, the current amplification factor is 0.8, the transistor is connected in common emitter configuration. The change in the collector current when the base current changes by 6 mA is
  • 6 mA
  • 4.8 mA
  • 24 mA
  • 8 mA
0:0:1


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