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Set 10 of 17 · Questions 271-300 of 501

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JEE Main Physics · Semiconductor Devices · Set 10 (Q271-300)

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  1. 271.
    The circuit diagram shown here corresponds to the logic gate,
    1. (1)NOR
    2. (2)AND
    3. (3)OR
    4. (4)NAND
  2. 272.
    The given electrical network is equivalent to [NEET 2017]
    1. (1)AND gate
    2. (2)OR gate
    3. (3)NOR gate
    4. (4)NOT gate
  3. 273.
    In a common emitter amplifier the input signal is applied across
    1. (1)anywhere
    2. (2)emitter-collector
    3. (3)collector-base
    4. (4)base-emitter.
  4. 274.
    Consider the following statements A and B and identify the correct answer. [NEET 2024](A) For a solar-cell, the characteristics lies in the (IV) quadrant of the given graph.(B) In a reverse biased junction diode, the current measured in , is due to majority charge carriers.
    1. (1)(A) is correct but (B) is incorrect.
    2. (2)(A) is incorrect but (B) is correct.
    3. (3)Both (A) and (B) are correct.
    4. (4)Both (A) and (B) are incorrect.
  5. 275.
    Boolean relation at the output stage-Y for the following circuit is:
    1. (1)
    2. (2)
    3. (3)A.B
    4. (4)A + B
  6. 276.
    When added an impurity into the silicon which one of the following produces ‐type of semiconductors? [2000]
    1. (1)Iron
    2. (2)Magnesium
    3. (3)Phosphorus
    4. (4)Aluminium
  7. 277.
    Consider the following logic circuit.

    The output is when:
    1. (1) and
    2. (2) and
    3. (3) and
    4. (4) and
  8. 278.
    For the given circuit of p‐n junction diode, which of the following statement is correct: [2002]
    1. (1)In forward biasing the voltage across is
    2. (2)In forward biasing the voltage across is 2 V
    3. (3)In reverse biasing the voltage across is
    4. (4)In reverse biasing the voltage across is 2 V
  9. 279.
    In the following circuit, the output for all possible inputs and is expressed by the truth table: [2007]
    1. (1)A
      B
      Y
      0
      0
      0
      0
      1
      0
      1
      0
      0
      1
      1
      1
    2. (2)A
      B
      Y
      0
      0
      1
      0
      1
      1
      1
      0
      1
      1
      1
      0
    3. (3)A
      B
      Y
      0
      0
      1
      0
      1
      0
      1
      0
      0
      1
      1
      0
    4. (4)A
      R
      Y
      0
      0
      0
      0
      1
      1
      1
      0
      1
      1
      1
      1
  10. 280.
    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 :
    (Figures are qualitative)
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  11. 281.
    The figure shows a logic circuit with two inputs and and the output . The voltage wave forms across and are as given. The logic circuit gate is [2012]
    1. (1)NAND gate
    2. (2)OR gate
    3. (3)NOR gate
    4. (4)AND gate
  12. 282.
    5 logic gates are connected as shown in the figure. If A and are the inputs, is the output then the truth table of the circuit is
    1. (1)


      0
      0
      0
      1
      0
      0
      0
      1
      0
      1
      1
      0
    2. (2)


      0
      0
      1
      1
      0
      0
      0
      1
      0
      1
      1
      1
    3. (3)


      0
      0
      0
      1
      0
      1
      0
      1
      1
      1
      1
      1
    4. (4)


      0
      0
      1
      1
      0
      1
      0
      1
      1
      1
      1
      1
  13. 283.
    In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is [2007]
    1. (1)‐type semiconductor
    2. (2)insulator
    3. (3)metal
    4. (4)‐type semiconductor
  14. 284.
    In the given figure, a diode is connected to an external resistance 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. (1)30 mA
    2. (2)40 mA
    3. (3)20 mA
    4. (4)35 mA
  15. 285.
    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. (1)
    2. (2)
    3. (3)
    4. (4)
  16. 286.
    In the given figure, each diode has a forward bias resistance of and infinite resistance in reverse bias. The current will be:
    1. (1)3.75A
    2. (2)2.35A
    3. (3)2A
    4. (4)2.73A
  17. 287.
    The output of the given logic circuit is:
    1. (1)AB+AB
    2. (2)A'B'+AB
    3. (3)AB
    4. (4)A+B
  18. 288.
    The behaviour of the circuit is like______ gate
    1. (1)OR
    2. (2)NOR
    3. (3)NAND
    4. (4)AND
  19. 289.
    To a germanium sample, traces of gallium are added as an impurity. The resultant sample would behave like [2003]
    1. (1)a conductor
    2. (2)an type semiconductor
    3. (3)a ‐type semiconductor
    4. (4)an insulator
  20. 290.
    In the digital circuit shown in the figure, for the and values are.
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  21. 291.
    The reading of the ammeter for a silicon diode in the given circuit is :
    1. (1)11.5mA
    2. (2)13.5 mA
    3. (3)0
    4. (4)15 mA
  22. 292.
    Application of a forward bias to a p‐n junction: [2005]
    1. (1)increases the number of donors on the ‐side
    2. (2)increases the electric field in the depletion zone
    3. (3)increases the potential difference across the depletion zone
    4. (4)widens the depletion zone
  23. 293.
    Name the logic gate equivalent to the diagram attached
    1. (1)NAND
    2. (2)AND
    3. (3)NOR
    4. (4)OR
  24. 294.
    In the given circuit the current through Zener Diode is close to:
    1. (1)0.0 mA
    2. (2)6.7 mA
    3. (3)6.0 mA
    4. (4)4.0 mA
  25. 295.
    To get the truth table shown, from the following logic circuit, the Gate should be
    1. (1)OR
    2. (2)AND
    3. (3)NOR
    4. (4)NAND
  26. 296.
    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. (1)40 A
    2. (2)100 A
    3. (3)7 A
    4. (4)10 A
  27. 297.
    A Zener of breakdown voltage Vz = 8V and maximum Zener current, =10 mA is subjected to an input voltage = 10V with series resistance R = 100. In the given circuit RL represents the variable load resistance. The ratio of maximum and minimum value of RL is______
  28. 298.
    A 8 V Zener diode along with a series resistance R is connected across a 20 V supply (as shown in the figure). If the maximum Zener current is 25 mA, then the minimum value of R will be_____.
  29. 299.
    The cut-off voltage of the diodes (shown in figure) in forward bias is 0.6 V. The current through the resister of 40 is_______mA.
  30. 300.
    The typical transfer characteristic of a transistor in CE configuration is shown in figure. A load resistor of 2 k is connected in the collector branch of the circuit used. The input resistance of the transistor is 0.50 k. The voltage gain of the transistor is