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 $$\alpha = 0.98$$, 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 $$15 V$$ is used in a voltage regulator circuit shown in figure. The current through the diode is
617258_f8824207229241008f85d1b6fbb16b8a.png
  • $$10 mA$$
  • $$15 mA$$
  • $$20 mA$$
  • $$5 mA$$
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 $$p-n$$ 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
  • $$\begin{vmatrix} A & B & Y \\ 0 & 0 & 0 \\ 0 & 1 & 1 \\ 1 & 0 & 1 \\ 1 & 1 & 0 \end{vmatrix}$$
  • $$\begin{vmatrix} A & B & Y \\ 0 & 0 & 1 \\ 0 & 1 & 1 \\ 1 & 0 & 1 \\ 1 & 1 & 1 \end{vmatrix}$$
  • $$\begin{vmatrix} A & B & Y \\ 0 & 0 & 1 \\ 0 & 1 & 0 \\ 1 & 0 & 1 \\ 1 & 1 & 0 \end{vmatrix}$$
  • $$\begin{vmatrix} A & B & Y \\ 0 & 0 & 1 \\ 0 & 1 & 1 \\ 1 & 0 & 0 \\ 1 & 1 & 1 \end{vmatrix}$$
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 $$p-n$$ 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?
A BY
$$0$$$$0$$$$1$$
$$0$$$$1$$$$1$$
$$1$$$$0$$$$1$$
$$1$$$$1$$$$0$$
  • 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 $$1 mA$$
  • The base current will be $$-1 mA$$
  • The emitter current will be $$9 mA$$
  • The emitter current Will be $$15 mA$$
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 $$5.00$$mS, the change in collector current is$$?$$
  • $$0.196$$mA
  • $$2.45$$mA
  • $$4.9$$mA
  • $$5.1$$mA
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 $$140$$mV at constant collector to emitter voltage. The change in the base current will be.
  • $$10$$mA
  • $$2$$mA
  • $$0.1$$mA
  • $$4$$mA
Lasers used in communication system are usually 
  • Ruby lasers
  • He-Ne laser
  • $$CO_2$$
  • Semiconductor
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Class 12 Medical Physics Quiz Questions and Answers