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

The following symbol represents
596726_77b5bbe43cdb4b6aaa14b86538dc531d.png
  • NAND gate
  • NOT gate
  • AND gate
  • OR gate
State whether given statement is True or False
The p-n type junction can act as a semiconductor diode
  • True
  • False
In the circuit below, $$A$$ and $$B$$ represent two inputs and $$C$$ represents the output.
The circuit represents 
596340_cc1b5d47149348108f38df36183b4308.PNG
  • $$\text{NOR gate}$$
  • $$\text{AND gate}$$
  • $$ gate$$
  • $$\text{OR gate}$$
Which of the following gates corresponds to the truth table given below?
596344.png
  • XOR
  • OR
  • NAND
  • NOR
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 circuit is equivalent to 
596187.jpg
  • AND gate
  • NOR gate
  • OR gate
  • NAND gate
State whether given statement is True or False
The depletion layer in the p-n junction region is caused by diffusion of carriers.
  • True
  • False
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
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
A logic gate which has an output $$'1'$$ only when the inputs are complement to each other is.
  • AND
  • NAND
  • NOR
  • EXOR
If the output $$Y$$ of the following circuit is $$1$$, the inputs $$ABC$$ must be :
606827.png
  • $$010$$
  • $$100$$
  • $$101$$
  • $$110$$
The following arrangement performs the logic function of _________ gate.
All the gates present above are NAND gate.

606402.png
  • AND
  • OR
  • NAND
  • EXOR
A photoelectric cell emits electrons when illuminated by a $$60\ W$$ bulb. If the same cell is illuminated by replacing it with a $$40\ W$$ bulb, the observation that can be made is
  • No photoelectric effect takes place
  • Number of photoelectrons increases
  • The kinetic energy of photoelectrons decreases
  • Number of photoelectrons decreases
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
To get an output $$y = 0$$ from the circuit shown in the figure, the input $$C$$ must be
616913_ad92cfd4d93f4e29be408e5e0ac2c714.png
  • $$0$$
  • $$1$$
  • Either $$0$$ or $$1$$
  • None of these
To get an OR gate from a NAND gate, we need
  • Only two NAND gates
  • Two NOT gates obtained from NAND gates and one NAND gate
  • Four NAND gates and two AND gates obtained from NAND gates
  • None of the above
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
  • $$10 mA$$
  • $$15 mA$$
  • $$20 mA$$
  • $$5 mA$$
For what value of A, B and C. The output of Y=1
617114_1439b241ec0944aaad9186f286e89611.png
  • 0 0 1
  • 1 0 1
  • 1 0 0
  • 0 1 0
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
Which logic gate produces 'LOW' output when any of the inputs is 'HIGH'?
  • AND
  • OR
  • NAND
  • NOR
The energy gap between the valence band and the conduction band for the material is $$>9eV$$. Identify the material.
  • An insulator
  • A metal
  • An intrinsic semiconductor
  • A superconductor
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
  • $$1,1$$
  • $$0,0$$
  • $$0,1$$
  • $$1,0$$
In the diagram, section A represents:
632696_1a66cbcc746044e799265df9900d70c3.jpg
  • N-type germanium
  • P-type germanium
  • Anode
  • Diode
Which of the following logic gates considered as universal?
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
The diagram of a logic circuit is given below. The output A of the circuit is represented by :
639666_6227c57ca6d8463faea04f75b53cf0c8.png
  • $$P \cdot (R+Q)$$
  • $$P \cdot (R\cdot Q)$$
  • $$P+ (R \cdot Q)$$
  • $$P+ (R +Q)$$
To get an output $$y = 1$$ from the circuit shown, the inputs $$A$$, $$B$$ and $$C$$ must be respectively 
638594_955fa2b4031449288e19c344aacd5512.png
  • $$0, 1, 0$$
  • $$1, 0, 0$$
  • $$1, 0, 1$$
  • $$1, 1, 0$$
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
Which of the following semi-conducting devices is used as voltage regulator?
  • Zener diode
  • LASER diode
  • Photo diode
  • Solar cell
The truth table for the following logic circuit is
639372_2b406f3633d946e7819545c209d7b072.png
  • $$\begin{vmatrix} A & B & Y \\ 0 & 0 & 0 \\ 0 & 1 & 1 \\ 1 & 0 & 1 \\ 1 & 1 & 0 \end{vmatrix}$$
  • $$\begin{vmatrix} A & B & Y \\ 0 & 0 & 1 \\ 0 & 1 & 1 \\ 1 & 0 & 1 \\ 1 & 1 & 1 \end{vmatrix}$$
  • $$\begin{vmatrix} A & B & Y \\ 0 & 0 & 1 \\ 0 & 1 & 0 \\ 1 & 0 & 1 \\ 1 & 1 & 0 \end{vmatrix}$$
  • $$\begin{vmatrix} A & B & Y \\ 0 & 0 & 1 \\ 0 & 1 & 1 \\ 1 & 0 & 0 \\ 1 & 1 & 1 \end{vmatrix}$$
The resistance of mercury at $$4.2\ K$$ is
  • Infinity
  • Greater than at lab temperature
  • Same as that of lab temperature
  • Almost zero
How many NAND gates are used in an OR gate?
  • Two
  • Three
  • Four
  • Five
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 a $$  p-n  $$ junction diode, change in temperature due to heating
  • Affects only reverse resistance
  • Affects only forward resistance
  • Affects the overall $$ V-| $$ characteristics of $$ p-n $$ junction
  • Does not affect resistance of p-n junction
For the combination of gates shown here, which of the following truth table part is not true?
640297_55d53dc7156f4339ba589bb61efb6c48.png
  • $$A = 0, B = 1, C = 1$$
  • $$A = 0, B = 0, C = 0$$
  • $$A = 1, B = 1, C = 1$$
  • $$A = 1, B = 0, C = 1$$
Which logic gate is represented by the following combination of logic gates?
640176_2da035019e6f4b89956654456a7df92e.png
  • OR
  • NAND
  • XOR
  • None of these
Find the corresponding truth table for the function Z of X and Y represented by given figure is :

640118_6191c63ff0754fd3b34604194a7d0513.png
  • None of these
Identify the operation performed by the circuit given below :
642861_fc704d8e32d14dba99d595dcfee766eb.jpg
  • NOT
  • AND
  • OR
  • NAND
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 :
  • $$0.98$$
  • $$50$$
  • $$98$$
  • $$49$$
To get an output Y$$=1$$ from circuit of adjoining figure, the input must be :
640219_d3dd36923cbc4339822321d7129380ce.png
  • A$$=0$$, B$$=1$$, C$$=0$$
  • A$$=1$$, B$$=0$$, C$$=0$$
  • A$$=1$$, B$$=0$$, C$$=1$$
  • A$$=1$$, B$$=1$$, C$$=0$$
What the circuit represents from the equivalent circuit?
641677_029844cf0e5743cabdf6aed03520495a.png
  • NAND gate
  • OR gate
  • AND gate
  • NOR gate
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 $$1$$
A rod of a certain metal is 1.0 m long and 0.6 cm in diameter. Its resistance is $$\displaystyle 3.0\times { 10 }^{ -3 }\Omega $$. Another disc made of the same metal is 2.0 cm in diameter and 1.0 mm thick. What is the resistance between the round faces of the disc?
  • $$\displaystyle 1.35\times { 10 }^{ -8 }\Omega $$
  • $$\displaystyle 2.70\times { 10 }^{ -7 }\Omega $$
  • $$\displaystyle 4.05\times { 10 }^{ -6 }\Omega $$
  • $$\displaystyle 8.10\times { 10 }^{ -5 }\Omega $$
In a Zener diode regulated power supply, unregulated DC input of $$10V$$ is applied. If the resistance$$(R_s)$$ connected in series with a Zener diode is $$200\Omega$$ and the Zener voltage $$V_z=5V$$, the current across the resistance $$R_s$$ is:
  • $$15mA$$
  • $$10mA$$
  • $$20mA$$
  • $$5mA$$
  • $$25mA$$
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 reverse biased $$p-n$$ junctions, the junction region consists of :
  • Holes
  • Electrons
  • Donor ions and acceptor ions
  • The intrinsic material
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
  • $$198 \Omega$$
  • $$300 \Omega$$
  • $$100 \Omega$$
  • $$400 \Omega$$
Which one of the following represents correctly the truth table of the configuration shown in figure?

654385_2f63f874c8c148a7bb7f47185d687eab.JPG
The following truth table corresponds to the logic gate
ABX
000
011
101
111
  • NAND
  • OR
  • AND
  • XOR
0:0:1


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