Semiconductor Devices PYQs Set 11 (PDF)

Set 11 of 16 · Questions 301-330 of 467

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Mere Teacher · Previous Year Questions NEET Physics · Semiconductor Devices · Set 11 (Q301-330)
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301. $Semiconductor X is made by doping a germanium crystal with arsenic (Z = 33) . A second semiconductor Y is made by doping germanium with indium (Z = 49) . The two are joined end to end and connected to a battery as shown. Which of the following statements is correct? [2012]$ (1) $X is P ‐type, Y is N ‐type and the junction is forward biased$ (2) $X is N ‐type, Y is P ‐type and the junction is forward biased$ (3) $X is P ‐type, Y is N ‐type and the junction is reverse biased$ (4) $X is N ‐type, Y is P ‐type and the junction is reverse biased$ 302. $The circuit shown below contains two ideal diodes, each with a forward resistance of 50Ω. If battery voltage is 6 V, the current through the 100Ω resistance (in Amperes) is:$ (1) $0.020$ (2) $0.030$ (3) $0.027$ (4) $0.036$ 303. $For the circuit shown below, the current through the Zener diode is :$ (1) $9 mA$ (2) $5 mA$ (3) $Zero$ (4) $14 mA$ 304. $The truth table for the given circuit is$ (1) $A B Y 111101010001$ (2) $A B Y 111101011001$ (3) $A B Y 111100011001$ (4) $A B Y 111101011000$ 305. $The truth table for the given logic circuit is [NEET 2022]$ (1) $A B C 001010100111$ (2) $A B B 001010101110$ (3) $A B C 000011100111$ (4) $A B C 001011101110$ 306. $For the given circuit, comment on the type of transformer used :$ (1) $Auxiliary transformer$ (2) $Auto transformer$ (3) $Step-up transformer$ (4) $Step down transformer$ 307. $A zener diode with 5 V zener voltage is used to regulate an unregulated dc voltage input of 25 V. For a 400Ω resistor connected in series, the zener current is found to be 4 times load current. The load current (I_{L}) and load resistance (R_{L}) are:$ (1) $I_{L} = 0.02 mA; R_{L} = 250Ω$ (2) $I_{L} = 10 A; R_{L} = 0.5Ω$ (3) $I_{L} = 10 mA; R_{L} = 500Ω$ (4) $I_{L} = 20 mA; R_{L} = 250Ω$ 308. $A Zener diode, having breakdown voltage equal to 15 V, is used in a voltage regulator circuit shown in the figure. The current through the diode is [2011]$ (1) $10 mA$ (2) $15 mA$ (3) $20 mA$ (4) $5 mA$ 309. $The truth table for the circuit given in the fig. is :$ (1) $(A B Y 001011101111)$ (2) $(A B Y 001010100110)$ (3) $(A B Y 001011100110)$ (4) $(A B Y 000010101111)$ 310. $Two p-n junction diodes D_{1} and D_{2} are connected as shown in figure. A and B are input signals and C is the output. The given circuit will function as a____.$ (1) $NOR Gate$ (2) $NAND Gate$ (3) $OR Gate$ (4) $AND Gate$ 311. $The maximum distance up to which TV transmission from a TV tower of height h can be received is proportional to [2003]$ (1) $h$ (2) $h^{3/2}$ (3) $h^{1/2}$ (4) $h^{2}$ 312. $To get an output Y = 1 in given circuit which of the following input will be correct [2012] A B C$ (1) $1 0 0$ (2) $1 0 1$ (3) $1 1 0$ (4) $0 1 0$ 313. $The circuit given below represents which of the logic operations? [2006]$ (1) $NOT$ (2) $AND$ (3) $OR$ (4) $NOR$ 314. $To get an output Y = 1 from the circuit shown below, the input must be [2010] A B C$ (1) $0 1 0$ (2) $0 0 1$ (3) $1 0 1$ (4) $1 0 0$ 315. $A logic gate circuit has two inputs A and B and output Y. The voltage waveforms of A, B and Y are shown below The logic gate circuit is$ (1) $AND gate$ (2) $OR gate$ (3) $NOR gate$ (4) $NAND gate$ 316. $Choose the correct waveform that can represent the voltage across R of the following circuit, assuming the diode is ideal one:$ (1) (2) (3) (4) 317. $A npn transistor conducts when [2003]$ (1) $Both collector and emitter are positive with respect to the base$ (2) $Collector is positive and emitter is negative with respect to the base$ (3) $Collector is positive and emitter is at the same potential as the base$ (4) $Both collector and emitter are negative with respect to the base$ 318. $The combination of ‘NAND’ gates shown below are equivalent to [2016]$ (1) $an OR gate and an AND gate, respectively$ (2) $an AND gate and a NOT gate, respectively$ (3) $an AND gate and an OR gate, respectively$ (4) $an OR gate and a NOT gate, respectively.$ 319. $When p - n junction diode is reverse biased, then [2006]$ (1) $no current flows$ (2) $the depletion region is reduced$ (3) $the height of the potential barrier is reduced$ (4) $the depletion region is increased$ 320. $In the given circuit, the breakdown voltage of the Zener diode is 3.0 V . What is the value of I_{2} ?$ (1) $3.3 mA$ (2) $5.5 mA$ (3) $10 mA$ (4) $7 mA$ 321. $Refer to the circuit diagram given in the figure. which of the following observations are correct? A. Total resistance of circuit is 6Ω B . Current in Ammeter is 1 AC. Potential across AB is 4 Volts. D. Potential across CD is 4 Volts E. Total resistance of the circuit is 8Ω . Choose the correct answer from the options given below:$ (1) $A, B and D Only$ (2) $A, B and C Only$ (3) $A, C and D Only$ (4) $B, C and E Only$ 322. $The circuit diagram shown here corresponds to the logic gate, [NEET 2019]$ (1) $NOR$ (2) $AND$ (3) $OR$ (4) $NAND$ 323. $The voltage gain of the following amplifier is [2005]$ (1) $10$ (2) $9.9$ (3) $1000$ (4) $100$ 324. $The logic circuit below has the truth table, same as that of$ (1) $NOR gate$ (2) $NAND gate$ (3) $AND gate$ (4) $OR gate$ 325. $The logic gate equivalent to the given logic circuit is:$ (1) $NAND$ (2) $OR$ (3) $NOR$ (4) $AND$ 326. $When a zener diode is used as a regulator with zener voltage of 10 V, nearly five times the load current passes through the zener diode. What should be the series resistance for the zener diode. If load resistance is 2 kΩ and the unregulated voltage supplied is 16 V .$ (1) $500Ω$ (2) $100Ω$ (3) $200Ω$ (4) $800Ω$ 327. $If in a p - n junction diode, a square input signal of 10 V is applied as shown Then, the output signal across RL will be$ (1) (2) (3) (4) 328. $Find the correct combination of A, B, C and D inputs which can cause the LED to glow.$ (1) $1101$ (2) $0011$ (3) $1000$ (4) $0100$ 329. $The logic performed by the circuit shown in figure is equivalent to$ (1) $AND$ (2) $NOR$ (3) $OR$ (4) $NAND$ 330. $Which logic gate is represented by the following combination of logic gates? [2015]$ (1) $OR$ (2) $NAND$ (3) $AND$ (4) $NOR$