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CBSE Questions for Class 12 Engineering Physics Semiconductor Electronics: Materials,Devices And Simple Circuits Quiz 10 - MCQExams.com

The following configuration of gate equivalent to :
669985_51ce92c9fffa4c4fa7899088d2f18081.jpg
  • NAND
  • XOR
  • OR
  • None of these
The combination of gates shown in the figure below produces.
668883_8c6839c9d5b64b2f962b7cc2e1c09bd5.jpg
  • NOR gate
  • OR gate
  • AND gate
  • XOR gate
In the circuit diagram, the current through the Zener diode is :
670010_28c1e722b3444cdea1f4cf04972dbf9d.jpg
  • 10mA
  • 3.33mA
  • 6.67mA
  • 0mA
Identify the mismatched pair from the following
  • zener diode : voltage regulator
  • germanium doped with phosphorous : n-type semiconductor
  • semiconductor : band gap > 3 eV
  • p-n junction diode : rectifier
  • silicon doped with aluminium : p-type semiconductor
The circuit gives the output as that of:
671310_a50e576169c24feea6eb63db87614e96.png
  • AND gate
  • OR gate
  • NAND gate
  • NOR gate
  • NOT gate
The circuit is equivalent to
678863_e96e7205457f41b0946fd28453d9e5e4.png
  • NOR gate
  • AND gate
  • NAND gate
  • OR gate
A and B are the two points on a uniform ring of radius r. The resistance of the rings is R and AOB=θ as shown in the figure. The equivalent resistance between points A and B is _____
676498_a41bb0cbe16946918b404fd28d870288.png
  • R(2πθ)4π
  • Rθ2π
  • R(1θ2π)
  • R4π2(2πθ)θ
Name the gate, which represents the Boolean expression Y=¯AB
  • NAND
  • AND
  • NOT
  • NOR
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
The inputs A, B and C to be given in order to get an output Y=1 from the following circuit are

671901_49814b6af20040669a8f6c7862827327.png
  • 0, 1, 0
  • 1, 0, 0
  • 1, 0, 1
  • 1, 1, 0
  • 0, 0, 1
Consider the circuit, the current through the Zener diode is
678748_1afc702901b142ad9c78d751ddbfaf4b.jpg
  • 20 mA
  • 10 mA
  • 15 mA
  • 40 mA
For which one of the following input combinations, the given logic circuit gives the output Y=1?
671348_452eb5f930ab47d99de3cdd5f90ec240.png
  • A=0,B=0,C=0
  • A=0,B=1,C=0
  • A=0,B=1,C=1
  • A=1,B=1,C=1
  • A=1,B=0,C=1
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
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
The following configuration of gates is equivalent to
685470_e3eaf12302cb46ee96cb57c01e5a7d8c.jpg
  • XOR
  • NAND
  • OR
  • None of these
The following logic circuit represents
691458_6cd9cb70f48f4fdcb564d982ceaddff5.PNG
  • NAND gate with output O=¯X+¯Y
  • NOR gate with output O=¯X+Y
  • NAND gate with output O=¯XY
  • NOR gate with output O=¯X.¯Y
The following truth table is for which gate ?
ABY=A + B
000
011
101
111
  • AND
  • OR
  • NOR
  • NAND
Select the output Y of the combination of gates shown in figure for inputs A=1,B=0;A=1,B=1 and A=0,B=0 respectively.
735438_7ee2f81630f44b2eab8e49ad859f9d0b.png
  • (0,1,1)
  • (1,0,1)
  • (1,1,1)
  • (1,0,0)
The arrangement shown in figure performs the logic function of
683232_3f5c68fd3997482798f3feae715a8765.PNG
  • OR gate
  • XNOR gate
  • AND gate
  • NAND gate
The diagram of a logic gate circuit is given below. The output Y of the circuit is represented by
685555_a40e68bd1baf4e1b8cba61e33d690202.jpg
  • A(B+C)
  • A(BC)
  • A+(BC)
  • A+(B+C)
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
Identify the gate used in the following diagram.
786026_94e0189886474ad3b93795e280368bde.png
  • AND
  • OR
  • NAND
  • NOR
A photodiode is symbolised by the graphic.
In a solid, an unfilled vacancy in an electronic energy level is called.
  • Hole
  • Majority carrier
  • Minority carrier
  • Electron
What will be the current flowing through the 6KΩ resistor in the circuit shown, where the breakdown voltage of the zener is 6V?
876180_e22774298cef4ba691cf0ec670a699bf.jpg
  • 23mA
  • 1mA
  • 10mA
  • 32mA
Which logic gate is represented by the following logic gates?
851514_e617187a5da34b79b282a8c968e27e60.PNG
  • NOR
  • NAND
  • AND
  • OR
A pure semiconductor is __________.
  • an extrinsic semiconductor
  • an intrinsic semiconductor
  • p-type semiconductor
  • n-type semiconductor
Which of following gates produces output of 1?
A hole is drilled in a copper sheet. The diameter of the hole is 4.24 cm at 27.0C. What is the change in the diameter of the hole when the sheet is heated to 227C? Coefficient of linear expansion of copper is 1.70 x 105 
  • 1.44×102 cm
  • 2.44×103 cm
  • 1.44×102mm
  • 2.44×103 mm
With increase in temperature the conductivity of?
  • Metals increases and of semiconductor decreases
  • Semiconductors increases and of metals decreases
  • In both metals and semiconductors increases
  • In both metal and semiconductor decreases
If the load resistance decreases in a zener regulator, the zener current
  • Decreases
  • Stays the same
  • Increases
  • Equals the source voltage divided by the series resistance
Diffusion is the process of.
  • Rarefaction of particles
  • Movement of particles through a semipermeable membrane
  • Movement of particles from higher concentration to lower concentration
  • Accumulation of particles on a solid surface
The logic circuit shown in the figure represents characteristic of which logic gate?
961206_e00849401ad44862886174957b45bf03.png
  • OR gate
  • NOR gate
  • AND gate
  • NAND gate
What is true about the breakdown voltage in a zener diode?
  • It decreases when current increases.
  • It destroys the diode.
  • It equals the current times the resistance.
  • It is approximately constant.
A heater is designed to operate with a power of 1000\ W in a 100\ V line. It is connected in combination with a resistance of 10\Omega and a resistance R, to a 100\ V mains as shown in the figure. What will be the value of R so that the heater operates with a power of 62.5\ W?
942507_322dd3b1a979442dbc119bc0f3740d5c.png
  • 15\Omega
  • 10\Omega
  • 5\Omega
  • 25\Omega
The current flowing through the zener diode in figure is:
969230_b78f9deedc4541398a9acd163541c1d7.png
  • 20\,mA
  • 25\,mA
  • 15\,mA
  • 5\,mA
The graph given represents the I-V characteristics of a Zener diode. Which part of the characteristic curve is most relevant for its operation as a voltage regulator?
993200_deb94cc9480b4751a2f1423e9911ff07.png
  • ab
  • bc
  • cd
  • de
Zener diodes with breakdown voltage ranging over 2V- 200 V are commercially available. Breakdown voltage of a zener diode
  • Increases with increasing doping concentration
  • Decreases with increasing doping concentration
  • Does not depend on doping concentration
  • May increases or decreases with increasing doping concentration
When the source voltage increases in a zener regulator, which of these currents remains approximately constant?
  • Series current
  • Zener current
  • Load current
  • Total current
There are two holes O1 and O2 in a tank of height H.The water emerging from O1 and O2 strikes the ground at the same points, as shown in fig.then.
1250081_b297416884f543059f5df395d45a6aed.PNG
  • H = {h_1} + {h_2}
  • H = {h_1} - {h_2}
  • H = {h_1} {h_2}
  • H = {h_1}/ {h_2}
Which of the following is a correct statement about current carrying conductor?
  • On increasing temperature drifts speed of free electron decreases
  • On increasing temperature drift speed of free electron increases
  • On increasing temperature, drift speed of free electron remains same.
  • On increasing P.D. average kinetic energy of electron decreases ( Neglected heating effect of electric current)
In the circuit shown in figure, the diode is ideal. The potential difference between A and B is?
993201_037ef3a077204b969fede4bdfa20ec81.png
  • V/4
  • V
  • Zero
  • V/2
The correct output for the given circuit is:
992736_9e6d2986c51f489fa9d7f0b5d1f87f3f.png
Read the following diagram and tell which of the following statements are true:
992745_b153f7a1a8d64eb694710871c4504b64.PNG
  • In circuit 1 lamp does not glow but in circuit 2 lamp glows
  • In circuit 1 as well as 2 lamp does not glow
  • In circuit 1 lamp glows but in 2 lamp does not glow
  • In both circuit lamp glows
Germanium and silicon junction diodes are connected in parallel. These are connected in series with a resistance R, a milliammeter (mA) and a key (K) as shown in Fig. When key (K) is closed a current begins to flow in the milliammeter. The potential drop across the germanium diode is then

993056_5228fd69f3ab459ca6ae7447965d0101.PNG
  • 0.3 V
  • 0.7 V
  • 1.1 V
  • 12 V
For the plate voltage, the plate current in a triode valve is maximum when the potential of :
  • The gird is positive and plate is negative
  • The grid is zero and plate is positive
  • The grid is negative and plate is positive
  • The grid is positive and plate is positive
The electrical conductivity of a semiconductor increases when emf radiation of wavelength shorter the 2480 nm is incident in it. The band gap (in eV) for the semiconductor is?
  • 0.9
  • 0.7
  • 0.5
  • 1.1
In a p-n junction diode, not connected to any circuit
  • The potential is the same everywhere
  • The p-type side is at a higher potential than the n-type side
  • There is an electric field at the junction directed from the n-type side to the p-type side
  • There is an electric field at the junction directed from the p-type side to the n-type side
Consider two npn transistors as shown in figure. If 0 volts corresponds to false and 5 volts correspond to true then the output at C correspond to true then the output at C corresponds to:
1013083_fe52e374e97a4de59f3d09a070560b26.png
  • A\ NAND\ B
  • A\ OR\ B
  • A and B
  • A\ NOR\ B
0:0:2


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