Semiconductor Devices PYQs Set 17 (PDF)

Set 17 of 17 · Questions 481-501 of 501

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Mere Teacher · Previous Year Questions JEE Main Physics · Semiconductor Devices · Set 17 (Q481-501)
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481. $For a p-type semiconductor, which of the following statements is true? [NEET 2019]$ (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) $Electrons are the majority carriers and trivalent atoms are the dopants.$ 482. $In the circuit shown here, assuming threshold voltage of diode is negligibly small, then voltage V_{AB} is correctly represented by:$ (1) $V_{A B} would be zero at all times$ (2) (3) (4) 483. $The truth table for the circuit given below is:$ (1) $A B Y 000100110011$ (2) $A B Y 000111101011$ (3) $A B Y 000101010110$ (4) $A B Y 000011101110$ 484. $In the logic circuit given below, if X = 1 and Y = 1 then the values of P, Q and R are$ (1) $P = 1, Q = 1, R = 0$ (2) $P = 0, Q = 1, R = 0$ (3) $P = 1, Q = 0, R = 1$ (4) $P = 1, Q = 1, R = 1$ 485. $A B E 00001 X 10 Y 110 In the truth table of the above circuit the value of X and Y are :$ (1) $0,0$ (2) $1,1$ (3) $1,0$ (4) $0,1$ 486. $The values of Y and Z in the given logic circuit are$ (1) $Y = 1, Z = 1$ (2) $Y = 0, Z = 1$ (3) $Y = 1, Z = 0$ (4) $Y = 0, Z = 0$ 487. $The following diagram shows a Zener diode as a voltage regulator. The Zener diode is rated at V_{z} = 5 V and the desired current in load is 5 mA . The unregulated voltage source can supply upto 25 V . Considering the Zener diode can withstand four times of the load current, the value of resistor R_{S} (shown in circuit) should be____Ω .$ (1) $100$ (2) $1000$ (3) $10$ (4) $None of the above$ 488. $When A = 0 and B = 1, the output is 0 for$ (1) $AND gate$ (2) $OR gate$ (3) $X-OR gate$ (4) $NAND gate$ 489. $For the given logic gates combination, the correct truth table will be$ (1) $A B X 001010100110$ (2) $A B X 000011101110$ (3) $A B X 001010101110$ (4) $A B X 000011101111$ 490. $The output (Y) of logic circuit given below is 0 only when:$ (1) $A = 1, B = 0$ (2) $A = 0, B = 1$ (3) $A = 0, B = 0$ (4) $A = 1, B = 1$ 491. $The correct truth table for the following logic circuit is :$ (1) $A B Y 001011100111$ (2) $A B Y 000011100111$ (3) $A B Y 001011100110$ (4) $A B Y 000010100111$ 492. $In the combination of the following gates the output Y can be written in terms of inputs A and B as: [2018]$ (1) $A \cdot B$ (2) $A\cdotB+A\cdotB$ (3) $A\cdotB'+A'\cdotB$ (4) $A + B$ 493. $A p-n junction (D) shown in the figure can act as a rectifier. An alternating current source (V) is connected in the circuit. The current (I) in the resistor (R) can be shown by:$ (1) (2) (3) (4) 494. $In the given circuit, when A = 1, B = 1 the values of X and Y respectively are$ (1) $1,0$ (2) $1,1$ (3) $0,1$ (4) $0,0$ 495. $Identify the logic operation carried out.$ (1) $OR$ (2) $AND$ (3) $NOR$ (4) $NAND$ 496. $The output (X) of the logic circuit shown in figure will be[2013]$ (1) $X = A, B$ (2) $X=A'\cdotB$ (3) $X=A\cdotB$ (4) $X = A + B$ 497. $The output of the circuit is low (zero) for: (A) X = 0, Y = 0 (B) X = 0, Y = 1 (C) X = 1, Y = 0 (D) X = 1, Y = 1 Choose the correct answer from the options given below:$ (1) $(B), (C) and (D) only$ (2) $(A), (B) and (C) only$ (3) $(A), (C) and (D) only$ (4) $(A), (B) and (D) only$ 498. $The output Y for the inputs A and B of circuit is given by Truth table of the shown circuit is :$ (1) $A B Y 001011101110$ (2) $A B Y 001010100111$ (3) $A B Y 000011101111$ (4) $A B Y 000011101110$ 499. $Output of following logic circuit is$ (1) $(A + B) + (A + C) + (B + C)$ (2) $(A+B)\cdot(A+C)\cdot(B+C)$ (3) $(A\cdotB)+(A\cdotC)+(B\cdotC)$ (4) $None$ 500. $The symbol given below represents$ (1) $A p-n-p transistor$ (2) $An n-p-n transistor$ (3) $A p-n junction diode$ (4) $An inductor$ 501. $As per the given circuit, the value of current through the battery will be...........A.$