Semiconductor Devices PYQs Set 15 (PDF)

Set 15 of 16 · Questions 421-450 of 467

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Mere Teacher · Previous Year Questions NEET Physics · Semiconductor Devices · Set 15 (Q421-450)
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421. $For the circuit shown above, equivalent GATE is:$ (1) $OR gate$ (2) $NAND gate$ (3) $NOT gate$ (4) $AND gate$ 422. $Identify the logic operation performed by the given circuit.$ (1) $NAND$ (2) $NOR$ (3) $OR$ (4) $AND$ 423. $Identify the operation performed by the circuit given below.$ (1) $AND$ (2) $NOT$ (3) $NAND$ (4) $OR$ 424. $Output at terminal Y of given logic circuit.$ (1) $1$ (2) $0$ (3) $Not determine$ (4) $Oscillating between 0 and 1$ 425. $The combination of the gates shown in the figure below produces [2009]$ (1) $NOR gate$ (2) $OR gate$ (3) $AND gate$ (4) $XOR gate$ 426. $The schematic symbol of light emitting diode is (LED)$ (1) (2) (3) (4) 427. $The output of following combination is same as that of$ (1) $AND gate$ (2) $OR gate$ (3) $NAND gate$ (4) $NOR gate$ 428. $The output Y of following circuit for given inputs is :$ (1) $Λ\cdotB(A+B)$ (2) $0$ (3) $A\cdotB$ (4) $A+B$ 429. $The given graph represents V - I characteristic for a semiconductor device. Which of the following statement is correct? [2014]$ (1) $It is V - I characteristic for solar cell where point A represents open circuit voltage and point B short circuit current$ (2) $It is for a solar cell and points A and B represent open circuit voltage and current, respectively$ (3) $It is for a photodiode and points A and B represent open circuit voltage and current, respectively$ (4) $It is for an LED and points A and B represents open circuit voltage and short circuit current respectively$ 430. $The output of an OR gate is connected to both the inputs of a NAND gate. The combination will serve as$ (1) $AND gate$ (2) $NOT gate$ (3) $NAND gate$ (4) $NOR gate$ 431. $In the circuit below, A and B represent two inputs and C represents the output, The circuit represents$ (1) $AND gate$ (2) $NAND gate$ (3) $OR gate$ (4) $NOR$ 432. $The truth table for this given circuit is :$ (1) $A B Y 001011101110$ (2) $A B Y 000011100111$ (3) $A B Y 000010100111$ (4) $A B Y 001010101110$ 433. $Identify the logic operation performed by the given circuit:$ (1) $AND gate$ (2) $OR gate$ (3) $NOR gate$ (4) $NAND gate$ 434. $The truth table of the given circuit diagram is :$ (1) $A B Y 001010100111$ (2) $A B Y 000011101110$ (3) $A B Y 000010100111$ (4) $A B Y 001011101110$ 435. $What is the output Y in the following circuit, when all the three inputs A, B, C are first 0 and then 1? [2016]$ (1) $1, 0$ (2) $1, 1$ (3) $0, 1$ (4) $0, 0$ 436. $'The output of 'NAND' gate is shown in the truthtable (A and B are inputs, Y is output) (P) A B Y 000011101111 (Q) A B Y 001010100111 (R) A B Y 001010100110 (S) A B Y 00011101110$ (1) $P$ (2) $R$ (3) $Q$ (4) $S$ 437. $A logic circuit provides the output Y as per the following truth table. [NEET 2024] (A, B, Y) = (0, 1, 0), (1, 0, 1), (1, 1, 0). The expression for the output Y is$ (1) $A \cdot B + A ˉ$ (2) $A \cdot B ˉ + A ˉ$ (3) $B ˉ$ (4) $B$ 438. $In a Zener diode,$ (1) $only p -region is heavily doped$ (2) $only n -region is heavily doped$ (3) $Both p and n regions are heavily doped$ (4) $Both p and n regions are lightly doped$ 439. $Photodiode is a device$ (1) $which is always operated in reverse bias$ (2) $which of always operated in forward bias$ (3) $in which photo current is independent of intensity of incident radiation$ (4) $which may be operated in forward or reverse bias.$ 440. $In the given circuit, value of Y is:$ (1) $toggles between 0 and 1$ (2) $0$ (3) $will not execute$ (4) $1$ 441. $In n type semiconductor, electrons are majority charge carriers but it does not show any negative charge. The reason is$ (1) $mobility of electrons is extremely small$ (2) $electrons are stationary$ (3) $atom is electrically neutral$ (4) $electrons neutralize with holes.$ 442. $Match the List I with List II List I (A) Intrinsic Semiconductor (B) n-type Semiconductor (C) p-type Semiconductor (D) Metals List II (I) Fermi-level near conduction band (II) Fermi-level at middle (III) Fermi-level near valence band (IV) Fermi-level inside conduction band Choose the correct answer from the options given below:$ (1) $(A) \to I, (B) \to II, (C) \to III, (D) \to IV$ (2) $(A) \to II, (B) \to I, (C) \to III, (D) \to IV$ (3) $(A) \to II, (B) \to III, (C) \to I, (D) \to IV$ (4) $(A) \to III, (B) \to I, (C) \to II, (D) \to IV$ 443. $Given below are two statements: Statement I: In a typical transistor, all three regions emitter, base and collector have same doping level. Statement II: In a transistor, collector is the thickest and base is the thinnest segment. In the light of the above statements, choose the most appropriate answer from the options given below.$ (1) $Both Statement I and Statement II are correct$ (2) $Both Statement I and Statement II are incorrect$ (3) $Statement I is incorrect but Statement II is correct$ (4) $Statement I is correct but Statement II is incorrect$ 444. $An n - p - n transistor can be considered to be equivalent to two diodes, connected. Which of the following figures is the correct one?$ (1) (2) (3) (4) 445. $Identify the solar cell characteristics from the following options :$ (1) (2) (3) (4) 446. $Constant DC voltage is required from a variable AC voltage. Which of the following is correct order of operation?$ (1) $Regulator, filter, rectifier$ (2) $Rectifier, regulator, filter$ (3) $Rectifier, filter, regulator$ (4) $Filter, regulator, rectifier$ 447. $Which of the following logic gates considered as universal?$ (1) (2) (3) (4) 448. $For a p-type semiconductor, which of the following statements is true? [NEET 2019]$ (1) $Holes are the majority carriers and trivalent atoms are the dopants.$ (2) $Holes are the majority carriers and pentavalent atoms are the dopants.$ (3) $Electrons are the majority carriers and pentavalent atoms are the dopants.$ (4) $Electrons are the majority carriers and trivalent atoms are the dopants.$ 449. $In the circuit shown here, assuming threshold voltage of diode is negligibly small, then voltage V_{AB} is correctly represented by:$ (1) $V_{A B} would be zero at all times$ (2) (3) (4) 450. $The truth table for the circuit given below is:$ (1) $A B Y 000100110011$ (2) $A B Y 000111101011$ (3) $A B Y 000101010110$ (4) $A B Y 000011101110$