Semiconductor Devices PYQs Set 9 (PDF)

Set 9 of 16 · Questions 241-270 of 467

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Mere Teacher · Previous Year Questions NEET Physics · Semiconductor Devices · Set 9 (Q241-270)
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241. $The logic operations performed by the given digital circuit is equivalent to:$ (1) $NOR$ (2) $AND$ (3) $OR$ (4) $NAND$ 242. $If each diode has a forward bias resistance of 25 Ω in the below circuit, Which of the following options is correct?$ (1) $\frac{I _{1}}{I _{2}} = 1$ (2) $\frac{I _{2}}{I _{1}} = 1$ (3) $\frac{I _{1}}{I _{2}} = 2$ (4) $\frac{I _{3}}{I _{4}} = 1$ 243. $The reverse breakdown voltage of a Zener diode is 5.6 V in the given circuit. The current I_{z} through the Zener is:$ (1) $10 mA$ (2) $17 mA$ (3) $15 mA$ (4) $7 mA$ 244. $The circuit has two oppositely connected ideal diodes in parallel. What is the current flowing in the circuit?$ (1) $2.0 A$ (2) $1.33 A$ (3) $1.71 A$ (4) $2.31 A$ 245. $The logic gate equivalent to the given circuit diagram is :$ (1) $OR$ (2) $NAND$ (3) $NOR$ (4) $AND$ 246. $For the transistor circuit shown below, if β = 100, voltage drop between emine r and base is 0.7 V then value of V_{Cl} will be [2017]$ (1) $10 V$ (2) $5 V$ (3) $13 V$ (4) $0 V$ 247. $The output of the given circuit diagram is$ (1) $A B Y 000100010111$ (2) $A B Y 000101011110$ (3) $A B Y 000100010110$ (4) $A B Y 000100011110$ 248. $To get output 1 for the following circuit, the correct choice for the input is [NEET 2016]$ (1) $A = 1, B = 0, C = 0$ (2) $A = 1, B = 1, C = 0$ (3) $A = 1, B = 0, C = 1$ (4) $A = 0, B = 1, C = 0$ 249. $Assuming in forward bias condition there is a voltage drop of 0.7 V across a silicon diode, the current through diode D_{1} in the circuit is____mA . (Assume all diodes in the given circuit are identical)$ (1) $17.6$ (2) $18.8$ (3) $11.7$ (4) $20.15$ 250. $In the following circuit, what are P and Q ?$ (1) $P = 0, Q = 1$ (2) $P = 0, Q = 0$ (3) $P = 1, Q = 1$ (4) $P = 1, Q = 0$ 251. $In the following common emitter configuration an npn transistor with current gain β = 100 is used. The output voltage of the amplifier will be$ (1) $10 mV$ (2) $0.1 V$ (3) $1.0 V$ (4) $10 V$ 252. $Two identical capacitors A and B, charged to the same potential 5V are connected in two different circuits as shown below at time t = 0. If the charge on capacitors A and B at time t = CR is Q_{A} and Q_{B} respectively, then (Here e is the base of natural logarithm)$ (1) $Q_{A} = VC, Q_{B} CV$ (2) $Q_{A} = VC, Q_{B} = VC/e$ (3) $Q_{A} = VC/e, Q_{B} = CV/2$ (4) $Q_{A} = CV/2, Q_{B} = VC/e$ 253. $What is output of the logic circuit shown below?$ (1) $Y = 0$ (2) $Y = 1$ (3) $Y=X$ (4) $Y=X'$ 254. $For a cubic crystal structure which one of the following relations indicating the cell characteristic is correct?[2007]$ (1) $a\neqb\neqc and α \neq = β and Y \neq = 9 0^{o}$ (2) $a\neqb\neqc and α = β = γ = 9 0^{o}$ (3) $a=b=c and α \neq = β \neq = γ = 9 0^{o}$ (4) $a=b=c and α = β = Y = 9 0^{o}$ 255. $The circuit diagram shown here corresponds to the logic gate,$ (1) $NOR$ (2) $AND$ (3) $OR$ (4) $NAND$ 256. $The given electrical network is equivalent to [NEET 2017]$ (1) $AND gate$ (2) $OR gate$ (3) $NOR gate$ (4) $NOT gate$ 257. $In a common emitter amplifier the input signal is applied across$ (1) $anywhere$ (2) $emitter-collector$ (3) $collector-base$ (4) $base-emitter.$ 258. $Consider the following statements A and B and identify the correct answer. [NEET 2024](A) For a solar-cell, the I - V characteristics lies in the (IV) quadrant of the given graph.(B) In a reverse biased p - n junction diode, the current measured in (μA), is due to majority charge carriers.$ (1) $(A) is correct but (B) is incorrect.$ (2) $(A) is incorrect but (B) is correct.$ (3) $Both (A) and (B) are correct.$ (4) $Both (A) and (B) are incorrect.$ 259. $Boolean relation at the output stage-Y for the following circuit is:$ (1) $A + B$ (2) $A . B$ (3) $A.B$ (4) $A + B$ 260. $When added an impurity into the silicon which one of the following produces n ‐type of semiconductors? [2000]$ (1) $Iron$ (2) $Magnesium$ (3) $Phosphorus$ (4) $Aluminium$ 261. $Consider the following logic circuit. The output is Y = 0 when:$ (1) $A = 1 and B = 0$ (2) $A = 0 and B = 0$ (3) $A = 1 and B = 1$ (4) $A = 0 and B = 1$ 262. $For the given circuit of p‐n junction diode, which of the following statement is correct: [2002]$ (1) $In forward biasing the voltage across R is V$ (2) $In forward biasing the voltage across R is 2 V$ (3) $In reverse biasing the voltage across R is V$ (4) $In reverse biasing the voltage across R is 2 V$ 263. $In the following circuit, the output Y for all possible inputs A and B is expressed by the truth table: [2007]$ (1) $A B Y 000010100111$ (2) $A B Y 001011101110$ (3) $A B Y 001010100110$ (4) $A R Y 000011101111$ 264. $Two Zener diodes (A and B) having breakdown voltages of 6V and 4V respectively, are connected as shown in the circuit below. The output voltage Vo variation with input voltage linearly increasing with time, is given by : (V_{input} = 0 V at t = 0) (Figures are qualitative)$ (1) (2) (3) (4) 265. $The figure shows a logic circuit with two inputs A and B and the output C . The voltage wave forms across A, B and C are as given. The logic circuit gate is [2012]$ (1) $NAND gate$ (2) $OR gate$ (3) $NOR gate$ (4) $AND gate$ 266. $5 logic gates are connected as shown in the figure. If A and B are the inputs, Y is the output then the truth table of the circuit is$ (1) $A B Y 000100010110$ (2) $A B Y 001100010111$ (3) $A B Y 000101011111$ (4) $A B Y 001101011111$ 267. $In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is a / an [2007]$ (1) $p ‐type semiconductor$ (2) $insulator$ (3) $metal$ (4) $n ‐type semiconductor$ 268. $In the given figure, a diode D is connected to an external resistance R = 100Ω and an emf of 3.5 V. If the barrier potential developed across the diode is 0.5 V, the current in the circuit will be$ (1) $30 mA$ (2) $40 mA$ (3) $20 mA$ (4) $35 mA$ 269. $Take the breakdown voltage of the Zener diode used in the given circuit as 6V. For the input voltage shown in figure below, the time variation of the output voltage is (Graphs drawn are schematic and not to scale)$ (1) (2) (3) (4) 270. $In the given figure, each diode has a forward bias resistance of 30Ω and infinite resistance in reverse bias. The current I_{1} will be:$ (1) $3.75A$ (2) $2.35A$ (3) $2A$ (4) $2.73A$