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CBSE Questions for Class 12 Medical Physics Semiconductor Electronics: Materials, Devices And Simple Circuits Quiz 9 - MCQExams.com

The truth table of the combination of the logic gates shown in the figure is
586457_0516a1f0c23c4694918aefffe121605c.png
If a signal passing through a gate is inhibited by sending a LOW into one of the inputs, and the output is HIGH, the gate is a(n):
  • AND
  • NAND
  • NOR
  • OR
For a common emitter circuit amplifier, the load resistance of the output circuit is 500 times the resistance of the input. circuit. If α=0.98, then, current gain is :
  • 0.98
  • 50
  • 98
  • 49
 For a transistor, the current amplification factor is 0.The transistor is connected in common emitter configuration. The change in collector current when the base current changes by 6 mA is
  • 1.2 mA
  • 24 mA
  • 3.6 mA
  • 4.8 mA
In graphs of the electronic band structure of solids, the band gap generally refers to the _______________________ between the top of the valence band and the bottom of the conduction band in insulators and semiconductors.
  • current difference
  • energy difference (in electron volts)
  • hole difference
  • none of the above
In common transistor circuit, the current gain is 0.On changing emitter current by 5.0 mA, the change in collector current is
  • 3.5 mA
  • 4.9 mA
  • 6.3 mA
  • 9.4 mA
Rectifiers are used to convert
  • Direct current to Alternating current
  • Alternating current to Direct current
  • High voltage to low voltage
  • Low voltage to high voltage
A logic gate which has an output 1 only when the inputs are complement to each other is.
  • AND
  • NAND
  • NOR
  • EXOR
Which of the following is not an advantage of Integrated Circuits (ICs).
  • Extremely small in size
  • High power consumption
  • Low cost
  • Less weight
The output wave form of full-wave rectifier is
If we add impurity to a metal those atoms also deflect electrons. Therefore,
  • The electrical and thermal conductivities both increase
  • The electrical and thermal conductivities both decrease
  • The electrical conductivity increases but thermal conductivity decreases
  • The electrical conductivity decrease but thermal conductivity increases
A Zener diode, having breakdown voltage equal to 15V is used in a voltage regulator circuit shown in figure. The current through the diode is
617258_f8824207229241008f85d1b6fbb16b8a.png
  • 10mA
  • 15mA
  • 20mA
  • 5mA
When the inputs of a two input logic gate are 0 and 0, the output is 1. When the inputs are 1 and 0 the output is 0. The logic gate is the type
  • AND
  • NAND
  • NOR
  • OR
A full wave rectifier circuit along with the input and output are shown in the figure. The contribution from the diode 1 is are
632338_2e333cd60db04849ad5d098a89e8c653.png
  • C
  • A, C
  • B & D
  • A, B, C, D
In a transistor biased in the common-emitter mode the emitter current is
  • Much smaller than base current
  • Much larger than base current
  • Nearly equal to the base current
  • Much smaller than the collector current
In an unbiased pn junction
  • Potential at p is more than that at n
  • Potential at p is less than that at n
  • Potential at p is equal to that at n
  • Potential at p is +ve and that at n is -ve
To get an output y=1 from the circuit shown, the inputs A, B and C must be respectively 
638594_955fa2b4031449288e19c344aacd5512.png
  • 0,1,0
  • 1,0,0
  • 1,0,1
  • 1,1,0
Which logic gate produces 'LOW' output when any of the inputs is 'HIGH'?
  • AND
  • OR
  • NAND
  • NOR
The following truth table corresponds to the logic gate :
ABY
000
011
101
111
  • NAND
  • AND
  • XOR
  • OR
A logic gate whose output will be in logic 0 state only when all inputs are in logic 1 state is called.
  • AND
  • OR
  • NOR
  • NAND
In the given circuit, the binary inputs at A and B are both 1 in one case and both 0 in the next case. The respective outputs at Y in these two cases will be
635265_63eee97881f64e8b8901e137508b3818.png
  • 1,1
  • 0,0
  • 0,1
  • 1,0
The truth table for the following logic circuit is
639372_2b406f3633d946e7819545c209d7b072.png
  • |ABY000011101110|
  • |ABY001011101111|
  • |ABY001010101110|
  • |ABY001011100111|
In the diagram, section A represents:
632696_1a66cbcc746044e799265df9900d70c3.jpg
  • N-type germanium
  • P-type germanium
  • Anode
  • Diode
For the combination of gates shown here, which of the following truth table part is not true?
640297_55d53dc7156f4339ba589bb61efb6c48.png
  • A=0,B=1,C=1
  • A=0,B=0,C=0
  • A=1,B=1,C=1
  • A=1,B=0,C=1
In reverse biased pn junctions, the junction region consists of :
  • Holes
  • Electrons
  • Donor ions and acceptor ions
  • The intrinsic material
Which logic gate is represented by the following combination of logic gates?
640176_2da035019e6f4b89956654456a7df92e.png
  • OR
  • NAND
  • XOR
  • None of these
The truth table given is for which gate?
BY
001
011
101
110
  • XOR
  • OR
  • AND
  • NAND
In an n-p-n transistor circuit, the collector current is 10 mA. If 96% of the electrons emitted reach the collector :
  • The base current will be 1mA
  • The base current will be 1mA
  • The emitter current will be 9mA
  • The emitter current Will be 15mA
The following truth table corresponds to the logic gate
ABX
000
011
101
111
  • NAND
  • OR
  • AND
  • XOR
In a transistor, the collector current is always less than the emitter current because :
  • Collector side is reverse biased and the emitter side is forward biased
  • A few electrons are lost in the base and only remaining ones reach the collector
  • Collector being reverse biased, attracts less electrons
  • Collector side is forward biased and emitter side is reverse biased
Identify the operation performed by the circuit given below :
642861_fc704d8e32d14dba99d595dcfee766eb.jpg
  • NOT
  • AND
  • OR
  • NAND
The output of a OR gate is 1 :
  • If either input is zero
  • If both inputs are zero
  • Only if both inputs are 1
  • If either or both inputs are 1
What the circuit represents from the equivalent circuit?
641677_029844cf0e5743cabdf6aed03520495a.png
  • NAND gate
  • OR gate
  • AND gate
  • NOR gate
In the adjoining circuit of logic gate, the output Y becomes zero if the inputs are
679165_38f58a031e084e21a72b488b7d03a334.png
  • A = 1, B = 1, C = 0
  • A = 0, B = 0, C = 0
  • A = 0, B = 1, C = 1
  • A = 1, B = 0, C = 0
For a transistor connected in common emitter mode, the voltage drop across the collector is 2.5 V and \beta is 50. Find the base current if R_C is 2k\Omega.
  • 10 \mu A
  • 15 \mu A
  • 20 \mu A
  • 25 \mu A
A system of logic gates is shown in the figure. From the study of truth table it can be found that to produce a high output (1) at R, we must have
679546_192b941bc3184933803e983560eafefd.png
  • X=0,Y=1
  • X=1,Y=1
  • X=1,Y=0
  • X=0,Y=0
What is the voltage gain in a common emitter amplifier, when input resistance is 3 \Omega and load resistance is 24 \Omega with \beta = 60?
  • 480
  • 2.4
  • 4.8
  • 8.4
In a common-emitter configuration, a transistor has \beta = 50 and input resistance 1 K \Omega. If the peak value of AC input is 0.01 V, then the peak value of collector current is
  • 0.01 \mu A
  • 500 \mu A
  • 100\mu A
  • 0.5 \mu A
  • 50\mu A
The input resistance of a common emitter transistor amplifier, if the output resistance is 500 k\Omega, the current gain \alpha = 0.98 and the power gain is 6.0625 \times 10^6, is
  • 198 \Omega
  • 300 \Omega
  • 100 \Omega
  • 400 \Omega
In a common base transistor circuit, the current gain is 0.98. On changing the emitter current by 5.00mS, the change in collector current is?
  • 0.196mA
  • 2.45mA
  • 4.9mA
  • 5.1mA
The efficiency of a full wave rectifier is?
  • Half of half wave rectifier
  • 3 times of half wave rectifier
  • Double of half wave rectifier
  • Same as half wave rectifier
The logic gates giving output '1' for the inputs of '1' and '0' are
  • AND and OR
  • OR and NOR
  • NAND and NOR
  • NAND and OR
  • AND and NOR
Consider the circuit, the current through the Zener diode is
678748_1afc702901b142ad9c78d751ddbfaf4b.jpg
  • 20\ mA
  • 10\ mA
  • 15\ mA
  • 40\ mA
A laser device produces amplification in the
  • Microwave region
  • Ultraviolet or visible region
  • Infrared region
  • None of the above
For given logic diagram, output F = 1, then inputs are:
761289_789c95f0b6484081834abaa103e42593.jpg
  • A = 0, B = 0, C = 0
  • A = 0, B = 1, C = 0
  • A = 1, B = 1, C = 1
  • A = 0, B = 0, C = 1
The following circuit represents.
741855_571ba4381eac4471802c2956ebfc2c55.jpg
  • OR gate
  • XOR gate
  • AND gate
  • NAND gate
Which logic gates mentioned below have the output value '0' when both the inputs are 1 
  • OR , NAND
  • AND , NOR
  • AND , OR
  • NOR , NAND
The following logic circuit represents
691458_6cd9cb70f48f4fdcb564d982ceaddff5.PNG
  • NAND gate with output O=\overline { X } +\overline { Y }
  • NOR gate with output O=\overline { X+Y }
  • NAND gate with output O=\overline { X-Y }
  • NOR gate with output O=\overline { X } .\overline { Y }
The current gain of a transistor in common emitter mode is 35. The change in collector current is 140mV at constant collector to emitter voltage. The change in the base current will be.
  • 10mA
  • 2mA
  • 0.1mA
  • 4mA
Lasers used in communication system are usually 
  • Ruby lasers
  • He-Ne laser
  • CO_2
  • Semiconductor
0:0:3


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