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

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
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
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
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

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
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
If the current constant for a transistor are $$\alpha$$ & $$\beta$$ then:
  • $$\alpha\beta=1$$
  • $$\beta>1,\alpha<1$$
  • $$\alpha=\beta$$
  • $$\beta<1,\alpha>1$$
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 given circuit, the current through the resistor $$2  k \Omega  $$ is:
1477347_a0b9a814a4fc444bbbe8641f47fd57fe.png
  • $$2 m A $$
  • $$6 m A $$
  • $$1 m A $$
  • $$18 m A $$
The following logic gate circuit in equivalent to an

1526434_8f7b0e8a86e645e2a0dfe23cca517746.png
  • NAND
  • OR
  • XOR
  • NOT
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
  • $$0.20 \,V$$
  • $$1.2 \,V$$
  • $$0.80 \,V$$
  • $$8.0 \,V$$
ASCII and EBCDIC are the popular character coding systems. What does ASCII stand for?
  • American Stable Code for International Interchange
  • American Standard Case for Institutional Interchange
  • American Standard Code for Information Interchange
  • American Standard Code for Interchange Information
The figure shown the function of 
1570622_733cee8dc2fb4036ad1e3d990103e2f2.png
  • $$OR$$ gate
  • $$NAND$$ gate
  • $$XOR$$ gate
  • $$AND$$ gate
The dc common emitter current gain of a n-p-n transistor is $$50$$. The potential difference applied across the collector and emitter of a transistor used in CE configuration is, $$V_{CE}=2V$$. If the collector resistance, $$R_C=4k\Omega$$, the base current $$(I_B)$$ and the collector current $$(I_C)$$ are?
  • $$I_B=10\mu A, I_C=0.5mA$$
  • $$I_B=0.5\mu A, I_C=10mA$$
  • $$I_B=5\mu A, I_C=1mA$$
  • $$I_B=1\mu A, I_C=0.5mA$$
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
  • $$5.0 \, mA$$
  • $$1.5 \, mA$$
  • $$8 \, mA$$
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
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
An incomplete sentence about transistors is given below:
The emitter .............. junction is and the collector............... junction is . The appropriate words for the dotted empty positions are, respectively, 
  • 'collector' and 'base'
  • 'base' and 'emitter'
  • 'collector' and 'emitter'
  • 'base' and 'base'
In a transistor, 
  • the emitter has the least concentration of impurity
  • the collector has the least concentration of impurity
  • the base has the least concentration of impurity
  • all the three regions have equal concentrations of impurity
Which logic is used to select the proper path out of two or more alternative paths in the program logic?
  • Sequence logic
  • Iteration logic
  • Selection logic
  • 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.
This component is required to process data into information and consists of integrated circuits.
  • Hard disk
  • RAM
  • CPU
  • ROM
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.
Let it, it and it, represent the emitter current, the collector current and the base current respectively in a transistor. Then 
  • it is slightly smaller than it
  • it is slightly greater than it
  • is is much smaller than it
  • it is much greater than it
In a normal operation of a transistor,
  • the base-emitter junction is forward-biased
  • the base-collector junction is forward-biased
  • the base-emitter junction is reverse-biased
  • the base-collector junction is reverse-biased.
The current amplification factor for common base circuit of a transistor is $$ 0.$$ When emitter current is2mA then base current is:
  • $$ 2.1 \mathrm{mA} $$
  • $$ 0.2 \mathrm{mA} $$
  • $$ 0.19 \mathrm{m} \mathrm{A} $$
  • $$ 1.9 \mathrm{mA} $$
0:0:1


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