Semiconductor Devices PYQs Set 10 (PDF)

Set 10 of 16 · Questions 271-300 of 467

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Mere Teacher · Previous Year Questions NEET Physics · Semiconductor Devices · Set 10 (Q271-300)
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271. $The output of the given logic circuit is:$ (1) $AB+AB$ (2) $A'B'+AB$ (3) $AB$ (4) $A+B$ 272. $The behaviour of the circuit is like______ gate$ (1) $OR$ (2) $NOR$ (3) $NAND$ (4) $AND$ 273. $To a germanium sample, traces of gallium are added as an impurity. The resultant sample would behave like [2003]$ (1) $a conductor$ (2) $an n - type semiconductor$ (3) $a p ‐type semiconductor$ (4) $an insulator$ 274. $In the digital circuit shown in the figure, for the P and Q values are.$ (1) $P = 0, Q = 1$ (2) $P = 1, Q = 0$ (3) $P = 0, Q = 0$ (4) $P = 1, Q = 1$ 275. $The reading of the ammeter for a silicon diode in the given circuit is :$ (1) $11.5mA$ (2) $13.5 mA$ (3) $0$ (4) $15 mA$ 276. $Application of a forward bias to a p‐n junction: [2005]$ (1) $increases the number of donors on the n ‐side$ (2) $increases the electric field in the depletion zone$ (3) $increases the potential difference across the depletion zone$ (4) $widens the depletion zone$ 277. $Name the logic gate equivalent to the diagram attached$ (1) $NAND$ (2) $AND$ (3) $NOR$ (4) $OR$ 278. $In the given circuit the current through Zener Diode is close to:$ (1) $0.0 mA$ (2) $6.7 mA$ (3) $6.0 mA$ (4) $4.0 mA$ 279. $To get the truth table shown, from the following logic circuit, the Gate G should be A 0011 B 0101 Y 0011$ (1) $OR$ (2) $AND$ (3) $NOR$ (4) $NAND$ 280. $A common emitter amplifier circuit, built using an npn transistor, is shown in figure. Its dc current gain is 250, RC = 1kΩ and VCC = 10 V. What is the minimum base current for VCE to reach saturation ?$ (1) $40 μ A$ (2) $100 μ A$ (3) $7 μ A$ (4) $10 μ A$ 281. $Consider the junction diode as ideal. The value of current flowing through AB is [NEET 2016]$ (1) $10^{- 2} A$ (2) $10^{- 1} A$ (3) $10^{- 3} A$ (4) $0$ 282. $Two ideal diodes are connected to a battery as shown in the circuit. The current supplied by the battery is [2012]$ (1) $0.5 A$ (2) $0.75 A$ (3) $zero$ (4) $0.25 A$ 283. $In the figure, given that V_{BB} supply can vary from 0 to 5.0 V , V_{CC} = 5 V, β_{dc} = 200, R_{B} = 100 kΩ, R_{C} = 1 KΩ and V_{BE} = 1.0 V . The minimum base current and the input voltage at which the transistor will go to saturation, will go to saturation, will be, respectively:$ (1) $25 μA and 3.5 V$ (2) $20 μA and 3.5 V$ (3) $25 μA and 2.8 V$ (4) $20 μA and 2.8 V$ 284. $The circuit given represents which of the logic operations?$ (1) $OR$ (2) $AND$ (3) $NOT$ (4) $NOR$ 285. $There is a electric circuit as shown in the figure. Find potential difference between points a and b .$ (1) $0 V$ (2) $15 V$ (3) $10 V$ (4) $5 V$ 286. $Transfer characteristics [output voltage (V_{0}) vs . Input voltage (V_{i})] for a base biased transistor in CE configuration is as shown m the figure. For using transistor as a switch, it is used [2012]$ (1) $m region (I)$ (2) $in region (III)$ (3) $both in regions (I) and in (III)$ (4) $in region (II)$ 287. $In the following logic circuit the sequence of the inputs A, B are (0,0), (0,1), (1,0) and (1,1). The output Y for this sequence will be:$ (1) $1,0,1,0$ (2) $0,1,0,1$ (3) $1,1,1,0$ (4) $0,0,1,1$ 288. $In the following circuit, the output Y becomes zero for the input combinations.$ (1) $A = 1, B = 0, C = 0$ (2) $A = 0, B = 1, C = 1$ (3) $A = 0, B = 0, C = 0$ (4) $A = 1, B = 1, C = 0$ 289. $A Zener diode of breakdown voltage 10 V is used as a voltage regulator as shown in the figure. The current through the Zener diode is$ (1) $50 mA$ (2) $0$ (3) $30 mA$ (4) $20 mA$ 290. $Two ammeters A_{1} and A_{2} are connected as shown in the given figure. By neglecting the internal resistance of the ammeters, the reading in the ammeter A_{1} is$ (1) $2 A$ (2) $0$ (3) $1 A$ (4) $4 A$ 291. $The resistivity (p) of semiconductor varies with temperature. Which of the following curve represents the correct behaviour?$ (1) (2) (3) (4) 292. $In the given circuit, the voltage across load resistance (R_{L}) is:$ (1) $8.75 V$ (2) $9.00 V$ (3) $8.50 V$ (4) $14.00 V$ 293. $In the circuit shown in the figure, the input voltage V_{i} is 20 V, V_{BE} = 0 and V_{CE} = 0 . The values of I_{B}, I_{C} and β are given by: [2018]$ (1) $l_{B} = 40 μA, I_{c} = 10 mA, β = 250$ (2) $I_{B} = 25 μA, I_{c} = 5 mA, β = 200$ (3) $I_{B} = 20 μA, I_{c} = 5 mA, β = 250$ (4) $l_{B} = 40 μA, I_{c} = 5 mA, β = 125$ 294. $The output from a NAND gate having inputs A and B given below will be,$ (1) (2) (3) (4) 295. $Which of the following logic gates is an universal gate? [2005]$ (1) $OR$ (2) $NAND$ (3) $AND$ (4) $NOT$ 296. $\|Truth table for system of four NAND gates as shown in figure is :$ (1) $A B Y 000011101110$ (2) $A B Y 000010101111$ (3) $A B Y 001011100110$ (4) $A B Y 001010100111$ 297. $The output Y of the given logic gate is similar to the output of an/a [NEET 2024]$ (1) $NAND gate$ (2) $NOR gate$ (3) $OR gate$ (4) $AND gate$ 298. $Following gates section is connected in a complete suitable circuit. For which of the following combination, bulb will glow (ON) :$ (1) $A = 0, B = 0, C = 0, D = 1$ (2) $A = 0, B = 1, C = 1, D = 1$ (3) $A = 1, B = 0, C = 0, D = 0$ (4) $A = 1, B = 1, C = 1, D = 0$ 299. $To get an output y = 1 from the circuit shown, the inputs A, B and C must be respectively$ (1) $1, 0, 1$ (2) $1, 1, 0$ (3) $0, 1, 0$ (4) $1, 0, 0$ 300. $A zener diode of power rating 1.6 W is to be used as voltage regulator. If the zener diode has a breakdown of 8 V and it has to regulate voltage fluctuating between 3 V and 10 V The value of resistance R_{s} for safe operation of diode will be$ (1) $10 Ω$ (2) $12 Ω$ (3) $13.3 Ω$ (4) $13 Ω$