CBSE Questions for Class 12 Engineering Physics Semiconductor Electronics: Materials,Devices And Simple Circuits Quiz 16 - MCQExams.com

In figure the approximate value of $$V_o$$ across the diode is 
1364293_df2d337e83e142259e407049000445a5.png
  • zero
  • 5V
  • 2.5 V
  • depends on the size of R
Given: $$A$$ and $$B$$ are input terminals.
Logic $$1\, = \, > \, 5\, V$$
Logic $$0\, = \, < \, 1\, V$$
Which logic gate operation, the above circuit does?
1364862_cd70f7f6f89d4bd695c54d5e0b7f317d.PNG
  • AND gate
  • OR gate
  • XOR gate
  • NOR gate
The output of the given logic circuit is 
1358969_7061b7af70694611a61dae5be4560646.png
  • $$AB+\overline { AB } $$
  • $$A\overline { B } $$
  • $$\overline { A } B$$
  • $$A\overline { B } +\overline { A } B$$
Which of the following statements is true in case of zener diode?
  • There is no similarity between forward chacteristic curve of a diode and zener diode
  • a zener diode has sharp breakdown voltage
  • A zener diode is always reverse biased
  • The zener diode is a heavily doped diode
Which one is in forward bias :
  • None of these
Which of the following P-N junction diode is reverse biased
The band diagrams of three semiconductors are given in the figure. From left to right they are respectively. 
1394933_3a1813c62cf64e7b877403b4d0b9f54d.JPG
  • n-intrinsic-p
  • p-intrinsic-n
  • intrinsic-p-n
  • intrinsic-n-p

The resistivity of a pure semiconductor is  $$0.5 \Omega\ m$$. If the electron and hole mobility be $$0.39$$ $$m^2/V-s$$ and $$0.19$$ $$m^2/V-s$$ respectively then calculate the intrinsic carrier concentration.
  • $$2.16 \times 10^{19} /m^3$$
  • $$4.64 \times 10^{18} /m^3$$
  • $$ 10^{20} /m^3$$
  • $$none\ of\ these$$
The number of minority carriers crossing the junction of a diode depends primarily on the :
  • concentration of doping impurities
  • magnitude of potential barrier
  • magnitude of the forward bias voltage
  • rate of thermal generation of electron-hole pair
The diffusion current in a P-N junction is-
  • from the N-side to the P-side
  • from the P-side to the N-side
  • from the N-side to the P-side if the junction is forward-biased and in the opposite direction if it is reverse baised
  • from the P-side to the N-side if the junction is forward-biased and in the opposite direction if it is reverse baised
Metals are all good electrical conductors, which of the following statements is correct?
  • Metals are soft and hence allow electrons to pass through
  • Metals posses small value of band gap
  • Metals have large void spaces in their lattices that accommodate electrons
  • Metals are high melting solids, so electrons can translate on their surface
The logic operation carried out by the circuit below is that of
1400063_aa616a7c3c6b4b048ecbe87bc94744f6.png
  • AND gate
  • OR gate
  • NOT gate
  • NAND gate

Current flowing in a Zener diode as shown in circuit: (Given diode is an ideal and $$V_z = 4V$$) 


1389479_e652fa0b63a94ca3999d8fbb0a112992.png
  • $$0.4$$ A
  • $$0.5$$ A
  • $$0.9$$ A
  • $$0.1$$ A
The given truth table is
ABY
000
101
011
110
  • XOR gate
  • NAND gate
  • OR gate
  • AND gate
What is the voltage across an ideal p-n junction diode for shown circuit?
1505007_94cee1f2263d4fc28ceb5c39a14b224a.png
  • 0.7 V
  • 1 V
  • 2 V
  • None of these
A zener diode having breakdown voltage equation to 15 V is used in voltage regulator circus shown in figure the current through diode is :
1525531_04b309aca7574575adc9f66badd2b59b.png
  • 100 mA
  • 95 mA
  • 150 mA
  • 195 mA
From the Zener diode circuit shown in figure, the current through the Zener diode is
1523694_79d2bed0524040658ba0273ade6acc1f.png
  • $$34mA$$
  • $$31.5mA$$
  • $$36.5mA$$
  • $$2.5mA$$
The charge in emitter current of a PNP transistor is 'x' and the corresponding change in the base current is 'y'. The $$\beta$$ factor of the transistor is
  • $$\dfrac{x}{y}$$
  • $$\dfrac{x-y}{x}$$
  • $$\dfrac{x-y}{y}$$
  • $$\dfrac{x+y}{y}$$
Zener diode is used as
  • Half wave rectifier
  • Full wave rectifier
  • ac voltage stabilizer
  • dc voltage stabilizer
In the diagram, the input is across the terminals A and C and the output is across B and D. Then, the output is
1445285_63140a512cb14c92aa0b72693183848f.png
  • zero
  • same as the input
  • full wave rectifier
  • half wave rectifier
In the given circuit, the current through the resistor $$2  k \Omega  $$ is:
1477347_a0b9a814a4fc444bbbe8641f47fd57fe.png
  • $$2 m A $$
  • $$6 m A $$
  • $$1 m A $$
  • $$18 m A $$
An input voltage $$V_i$$ of $$0.20 \,V$$ is applied to an operational amplifier connected as shown in the diagram. What is the output voltage $$V_0$$?
1578595_c66295c4194642be9072fac6dc48ae44.png
  • $$0.20 \,V$$
  • $$1.2 \,V$$
  • $$0.80 \,V$$
  • $$8.0 \,V$$
The figure shown the function of 
1570622_733cee8dc2fb4036ad1e3d990103e2f2.png
  • $$OR$$ gate
  • $$NAND$$ gate
  • $$XOR$$ gate
  • $$AND$$ gate
In an unbiased p-n junction which of the following is correct?
  • p- side is at higher potential than n-side
  • n-side is at higher potential than p-side
  • Both p-side and n-side are at the same potential
  • Any of the above is possible depending upon the carrier density in the two sides
What is the Boolean equation of the networking in figure..
1554799_2dbea04510a34061975c4882bd6aef3c.png
  • ABCD
  • A + BCD
  • A + B + C + D
  • AB + CD
In the circuit diagram of zener diode as shown in figure, when the value of $$V_0$$ is $$8$$ volt, the current through zener diode s $$i_1$$ and when $$V_0$$ is $$16$$ volt, the corresponding current is $$i_2$$. Find the value of $$(i_2 - i_1)$$. (Zener  breakdown voltage = $$V_2 = 6V$$)
1612447_e6e7be35cd9b481d9cc90412bcfa1a32.png
  • zero
  • $$5.0 \, mA$$
  • $$1.5 \, mA$$
  • $$8 \, mA$$
A junction diode of  internal resistnace 20 $$\Omega $$  is used for half wave rectification.   If the applied voltage has a peak value of 50 V and load resistance is 800 $$\Omega $$ ,  then d,c.  output power is 
  • 0.3 watt
  • 0.2 watt
  • 0.1 watt
  • 0.5 watt
In  $$n$$ -type semiconductor when all donor states are filled, then the net charge density in the donor states becomes
  • $$1$$
  • $$< 1$$
  • $$< 1 ,$$ but not zero
  • zero
The following logic gate circuit in equivalent to an

1526434_8f7b0e8a86e645e2a0dfe23cca517746.png
  • NAND
  • OR
  • XOR
  • NOT
In the circuit given A, B and C are inputs and Y is the output. The output of Y is:
1528967_28de73fa29da42e885b18a59f3635dce.png
  • Low for all low inputs
  • High for all the high inputs
  • High for all the low inputs
  • None of these
 In a p-n junction, 
  • new holes and conduction electrons are produced continuously throughout the material
  • new holes and conduction electrons are produced continuously throughout the material except in the depletion region
  • holes and conduction electrons recombine continuously throughout the material
  • holes and conduction electrons recombine continuously throughout the material except in the depletion region.
An adder which adds three binary digits and outputs a result bit and a carry bit is referred as
  • Half adder
  • Quarter adder
  • Full adder
  • None of these
The electrical conductivity of pure germanium can be increased by.
  • increasing the temperature
  • doping acceptor impurities
  • doping donor impurities
  • irradiating ultraviolet light on it.
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