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Electronic Devices

183 questions · Physics · JEE Main
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Electronic Devices

183 questions · Physics · JEE Main

  1. 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 (IL​)…2025 · 2 Apr · Shift 1 · Q68 · MCQ
  2.  In the digital circuit shown in the figure, for the given inputs the P and Q values are :  Includes diagram2025 · 2 Apr · Shift 2 · Q59 · MCQ
  3.  Choose the correct logic circuit for the given truth table having inputs A and B.  Includes table2025 · 3 Apr · Shift 1 · Q70 · MCQ
  4. The truth table corresponding to the circuit given below is:  Includes diagram2025 · 3 Apr · Shift 2 · Q62 · MCQ
  5. The Boolean expression Y=ABˉC+AˉCˉ can be realised with which of the following gate configurations. A. One 3-input AND gate, 3 NOT gates and one 2-input OR gate, One 2-input AND gate, B. One 3 -input AND gate,…2025 · 4 Apr · Shift 1 · Q66 · MCQ
  6. Consider a n-type semiconductor in which ne​ and nh​ are number of electrons and holes, respectively. (A) Holes are minority carriers (B) The dopant is a pentavalent atom (C) ne​nh​eqni2​…2025 · 4 Apr · Shift 2 · Q69 · MCQ
  7. In the following circuit, the reading of the ammeter will be ( Take Zener breakdown voltage =4 V) Includes diagram2025 · 7 Apr · Shift 1 · Q68 · MCQ
  8. Consider the following logic circuit. The output is Y = 0 when : Includes diagram2025 · 7 Apr · Shift 2 · Q66 · MCQ
  9. The output voltage in the following circuit is (Consider ideal diode case) Includes diagram2025 · 8 Apr · Shift 2 · Q57 · MCQ
  10. Which of the following circuits represents a forward biased diode? Choose the correct answer from the options given below: Includes diagram2025 · 22 Jan · Shift 1 · Q59 · MCQ
  11. To obtain the given truth table, following logic gate should be placed at G : Includes diagram2025 · 22 Jan · Shift 2 · Q59 · MCQ
  12. 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 A C. Potential across AB is 4 Volts. D. Potential across CD is 4… Includes diagram2025 · 23 Jan · Shift 1 · Q63 · MCQ
  13. What is the current through the battery in the circuit shown below? Includes diagram2025 · 23 Jan · Shift 2 · Q56 · MCQ
  14. Consider the following statements : A. The junction area of solar cell is made very narrow compared to a photo diode. B. Solar cells are not connected with any external bias. C. LED is made of lightly doped p-n junction. D. Increase of…2025 · 24 Jan · Shift 1 · Q62 · MCQ
  15. 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 : Includes diagram2025 · 24 Jan · Shift 2 · Q55 · MCQ
  16. Which of the following circuits has the same output as that of the given circuit? Includes diagram2025 · 28 Jan · Shift 1 · Q67 · MCQ
  17. For the circuit shown above, equivalent GATE is : Includes diagram2025 · 29 Jan · Shift 1 · Q53 · MCQ
  18. The truth table for the circuit given below is: Includes diagram2025 · 29 Jan · Shift 2 · Q64 · MCQ
  19. In the given circuit if the power rating of Zener diode is 10 mW, the value of series resistance Rs​ to regulate the input unregulated supply is : Includes diagram2024 · 1 Feb · Shift 1 · Q80 · MCQ
  20. To measure the temperature coefficient of resistivity α of a semiconductor, an electrical arrangement shown in the figure is prepared. The arm BC is made up of the semiconductor. The experiment is being conducted at 25∘C… Includes diagram2024 · 1 Feb · Shift 2 · Q76 · MCQ
  21. The value of net resistance of the network as shown in the given figure is : Includes diagram2024 · 4 Apr · Shift 1 · Q77 · MCQ
  22. Which of the diode circuit shows correct biasing used for the measurement of dynamic resistance of p-n junction diode :2024 · 4 Apr · Shift 2 · Q64 · MCQ
  23. Identify the logic gate given in the circuit : Includes diagram2024 · 4 Apr · Shift 2 · Q80 · MCQ
  24. Following gates section is connected in a complete suitable circuit. For which of the following combination, bulb will glow (ON) : Includes diagram2024 · 5 Apr · Shift 1 · Q73 · MCQ
  25. The output (Y) of logic circuit given below is 0 only when : Includes diagram2024 · 5 Apr · Shift 2 · Q75 · MCQ
  26. The correct truth table for the following logic circuit is : Includes diagram2024 · 6 Apr · Shift 1 · Q63 · MCQ
  27. The acceptor level of a p-type semiconductor is 6 eV. The maximum wavelength of light which can create a hole would be : Given hc=1242 eV nm.2024 · 6 Apr · Shift 2 · Q65 · MCQ
  28. The output Y of following circuit for given inputs is : Includes diagram2024 · 8 Apr · Shift 1 · Q67 · MCQ
  29. A potential divider circuit is connected with a dc source of 20 V, a light emitting diode of glow in voltage 1.8 V and a zener diode of breakdown voltage of 3.2 V. The length (PR) of the resistive wire… Includes diagram2024 · 8 Apr · Shift 2 · Q84 · Numerical
  30. A light emitting diode (LED) is fabricated using GaAs semiconducting material whose band gap is 1.42 eV. The wavelength of light emitted from the LED is :2024 · 9 Apr · Shift 1 · Q66 · MCQ
  31. In the truth table of the above circuit the value of X and Y are : Includes diagram2024 · 9 Apr · Shift 2 · Q62 · MCQ
  32. The I-V characteristics of an electronic device shown in the figure. The device is : Includes diagram2024 · 9 Apr · Shift 2 · Q70 · MCQ
  33. Which of the following circuits is reverse - biased?2024 · 27 Jan · Shift 1 · Q67 · MCQ
  34. The truth table of the given circuit diagram is : Includes diagram2024 · 27 Jan · Shift 2 · Q78 · MCQ
  35. In the given circuit, the breakdown voltage of the Zener diode is 3.0 V. What is the value of Iz​ ? Includes diagram2024 · 29 Jan · Shift 1 · Q76 · MCQ
  36. The truth table for this given circuit is : Includes diagram2024 · 29 Jan · Shift 2 · Q65 · MCQ
  37. 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 : Includes diagram2024 · 30 Jan · Shift 1 · Q74 · MCQ
  38. In the given circuit, the voltage across load resistance (R L​) is : Includes diagram2024 · 30 Jan · Shift 2 · Q63 · MCQ
  39. Identify the logic operation performed by the given circuit. Includes diagram2024 · 31 Jan · Shift 1 · Q80 · MCQ
  40. The output of the given circuit diagram is - Includes diagram2024 · 31 Jan · Shift 2 · Q80 · MCQ
  41. Match List I with List II: Choose the correct answer from the options given below : Includes table2023 · 1 Feb · Shift 1 · Q47 · MCQ
  42. Choose the correct statement about Zener diode :2023 · 1 Feb · Shift 2 · Q56 · MCQ
  43. Name the logic gate equivalent to the diagram attached Includes diagram2023 · 6 Apr · Shift 1 · Q45 · MCQ
  44. The resistivity (ρ) of semiconductor varies with temperature. Which of the following curve represents the correct behaviour :2023 · 6 Apr · Shift 1 · Q58 · MCQ
  45. Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: Diffusion current in a p-n junction is greater than the drift current in magnitude if the junction is forward biased. Reason…2023 · 6 Apr · Shift 2 · Q51 · MCQ
  46. For the logic circuit shown, the output waveform at Y is: Includes diagram2023 · 8 Apr · Shift 1 · Q62 · MCQ
  47. A zener diode of power rating 1.6 W is to be used as voltage regulator. If the zener diode has a breakdown of 8V and it has to regulate voltage fluctuating between 3 V and 10 V. The value of resistance Rs for safe operation of diode will be Includes diagram2023 · 10 Apr · Shift 1 · Q64 · MCQ
  48. If each diode has a forward bias resistance of 25 Ω in the below circuit, Which of the following options is correct : Includes diagram2023 · 10 Apr · Shift 2 · Q40 · MCQ
  49. The logic performed by the circuit shown in figure is equivalent to : Includes diagram2023 · 11 Apr · Shift 1 · Q55 · MCQ
  50. The logic operations performed by the given digital circuit is equivalent to: Includes diagram2023 · 11 Apr · Shift 2 · Q53 · MCQ
  51. For the following circuit and given inputs A and B, choose the correct option for output 'Y' Includes diagram2023 · 13 Apr · Shift 1 · Q60 · MCQ
  52. The output from NAND gate having inputs A and B given below will be, Includes diagram2023 · 13 Apr · Shift 2 · Q55 · MCQ
  53. In the given circuit, the current (I) through the battery will be Includes diagram2023 · 15 Apr · Shift 1 · Q48 · MCQ
  54. Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R Assertion A : Photodiodes are preferably operated in reverse bias condition for light intensity measurement. Reason R : The current in…2023 · 24 Jan · Shift 1 · Q45 · MCQ
  55. The logic gate equivalent to the given circuit diagram is : Includes diagram2023 · 24 Jan · Shift 2 · Q45 · MCQ
  56. Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R Assertion A : Photodiodes are used in forward bias usually for measuring the light intensity. Reason R : For a p-n junction diode, at…2023 · 25 Jan · Shift 1 · Q50 · MCQ
  57. Statement I : When a Si sample is doped with Boron, it becomes P type and when doped by Arsenic it becomes N-type semi conductor such that P-type has excess holes and N-type has excess electrons. Statement II : When such P-type and N-type…2023 · 25 Jan · Shift 2 · Q60 · MCQ
  58. Which one of the following statement is not correct in the case of light emitting diodes? A. It is a heavily doped p-n junction. B. It emits light only when it is forward biased. C. It emits light only when it is reverse biased. D. The…2023 · 29 Jan · Shift 1 · Q62 · MCQ
  59. For the given logic gates combination, the correct truth table will be Includes diagram2023 · 29 Jan · Shift 2 · Q59 · MCQ
  60. The output waveform of the given logical circuit for the following inputs A and B as shown below, is : Includes diagram2023 · 30 Jan · Shift 1 · Q45 · MCQ
  61. The output Y for the inputs A and B of circuit is given by Truth table of the shown circuit is: Includes diagram2023 · 30 Jan · Shift 2 · Q59 · MCQ
  62. The effect of increase in temperature on the number of electrons in conduction band (ne​) and resistance of a semiconductor will be as:2023 · 31 Jan · Shift 1 · Q51 · MCQ
  63. In the given circuit, the value of current IL will be ​ mA. (When RL = 1k Ω) Includes diagram2022 · 24 Jun · Shift 2 · Q67 · Numerical
  64. In the circuit, the logical value of A=1 or B=1 when potential at A or B is 5 V and the logical value of A=0 or B=0 when potential at A or B is 0 V. The truth table of the given circuit will be : Includes diagram2022 · 25 Jul · Shift 1 · Q60 · MCQ
  65. The energy band gap of semiconducting material to produce violet (wavelength = 4000 Ao​) LED is ​eV. (Round off to the nearest integer).2022 · 25 Jul · Shift 1 · Q68 · Numerical
  66. Two ideal diodes are connected in the network as shown in figure. The equivalent resistance between A and B is ​Ω. Includes diagram2022 · 25 Jul · Shift 2 · Q67 · Numerical
  67. The photodiode is used to detect the optical signals. These diodes are preferably operated in reverse biased mode because :2022 · 25 Jun · Shift 1 · Q59 · MCQ
  68. Identify the logic operation performed by the given circuit: Includes diagram2022 · 25 Jun · Shift 2 · Q62 · MCQ
  69. In the circuit shown below, maximum zener diode current will be ​mA. Includes diagram2022 · 26 Jul · Shift 1 · Q72 · Numerical
  70. The I-V characteristics of a p-n junction diode in forward bias is shown in the figure. The ratio of dynamic resistance, corresponding to forward bias voltage of 2 V and 4 V respectively, is : Includes diagram2022 · 26 Jun · Shift 1 · Q58 · MCQ
  71. As per the given circuit, the value of current through the battery will be ​ A. Includes diagram2022 · 26 Jun · Shift 1 · Q66 · Numerical
  72. 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 : Includes diagram2022 · 27 Jul · Shift 1 · Q62 · MCQ
  73. Identify the correct Logic Gate for the following output (Y) of two inputs A and B. Includes diagram2022 · 27 Jun · Shift 1 · Q59 · MCQ
  74. The cut-off voltage of the diodes (shown in figure) in forward bias is 0.6 V. The current through the resister of 40 Ω is ​ mA. Includes diagram2022 · 27 Jun · Shift 2 · Q72 · Numerical
  75. Identify the solar cell characteristics from the following options :2022 · 28 Jul · Shift 1 · Q63 · MCQ
  76. For using a multimeter to identify diode from electrical components, choose the correct statement out of the following about the diode :2022 · 28 Jun · Shift 1 · Q58 · MCQ
  77. In the given circuit the input voltage Vin is shown in figure. The cut-in voltage of p-n junction diode (D1 or D2) is 0.6 V. Which of the following output voltage (V0) waveform across the diode is correct? Includes diagram2022 · 28 Jun · Shift 2 · Q67 · MCQ
  78. A zener of breakdown voltage Vz = 8 V and maximum zener current, IZM = 10 mA is subjectd to an input voltage Vi = 10 V with series resistance R = 100 Ω. In the given circuit RL represents the variable load resistance. The ratio of… Includes diagram2022 · 28 Jun · Shift 2 · Q69 · Numerical
  79. If the potential barrier across a p-n junction is 0.6 V. Then the electric field intensity, in the depletion region having the width of 6×10−6 m, will be ​×105 N/C…2022 · 29 Jul · Shift 1 · Q76 · Numerical
  80. 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 ​Ω… Includes diagram2022 · 29 Jul · Shift 2 · Q68 · Numerical
  81. A potential barrier of 0.4 V exists across a p-n junction. An electron enters the junction from the n-side with a speed of 6.0 × 105 ms − 1. The speed with which electron enters the p side will be 3x​×105 ms…2022 · 29 Jun · Shift 2 · Q66 · Numerical
  82. The circuit diagram used to study the characteristic curve of a zener diode is connected to variable power supply (0 − 15 V) as shown in figure. A zener diode with maximum potential Vz = 10 V and maximum power dissipation of 0.4 W is… Includes diagram2022 · 30 Jun · Shift 1 · Q67 · Numerical
  83. In the given figure, each diode has a forward bias resistance of 30 Ω and infinite resistance in reverse bias. The current I1 will be : Includes diagram2021 · 1 Sep · Shift 2 · Q58 · MCQ
  84. The value of power dissipated across the zener diode (Vz = 15V) connected in the circuit as shown in the figure is x × 10 − 1 watt. The value of x, to the nearest integer, is ​. Includes diagram2021 · 16 Mar · Shift 1 · Q62 · Numerical
  85. In the logic circuit shown in the figure, if input A and B are 0 to 1 respectively, the output at Y would be 'x'. The value of x is ​. Includes diagram2021 · 16 Mar · Shift 1 · Q68 · Numerical
  86. The following logic gate is equivalent to : Includes diagram2021 · 16 Mar · Shift 2 · Q48 · MCQ
  87. The output of the given combination gates represents : Includes diagram2021 · 17 Mar · Shift 1 · Q59 · MCQ
  88. Which one of the following will be the output of the given circuit? Includes diagram2021 · 17 Mar · Shift 2 · Q44 · MCQ
  89. For the circuit shown below, calculate the value of Iz : Includes diagram2021 · 20 Jul · Shift 1 · Q46 · MCQ
  90. A zener diode having zener voltage 8 V and power dissipation rating of 0.5 W is connected across a potential divider arranged with maximum potential drop across zener diode is as shown in the diagram. The value of protective resistance Rp… Includes diagram2021 · 20 Jul · Shift 2 · Q64 · Numerical
  91. For the forward biased diode characteristics shown in the figure, the dynamic resistance at ID = 3 mA will be ​Ω. Includes diagram2021 · 20 Jul · Shift 2 · Q68 · Numerical
  92. Consider a situation in which reserve biased current of a particular P-N junction increases when it is exposed to a light of wavelength ≤ 621 nm. During this process, enhancement in carrier concentration takes place due to generation…2021 · 22 Jul · Shift 2 · Q64 · MCQ
  93. In a given circuit diagram, a 5 V zener diode along with a series resistance is connected across a 50 V power supply. The minimum value of the resistance required, if the maximum zener current is 90 mA will be ​Ω… Includes diagram2021 · 22 Jul · Shift 2 · Q68 · Numerical
  94. In connection with the circuit drawn below, the value of current flowing through 2 k Ω resistor is ​× 10 − 4 A. Includes diagram2021 · 24 Feb · Shift 1 · Q70 · Numerical
  95. The logic circuit shown above is equivalent to : Includes diagram2021 · 24 Feb · Shift 2 · Q44 · MCQ
  96. Zener breakdown occurs in a p − n junction having p and n both :2021 · 24 Feb · Shift 2 · Q58 · MCQ
  97. A 5V battery is connected across the points X and Y. Assume D1 and D2 to be normal silicon diodes. Find the current supplied by the battery if the +ve terminal of the battery is connected to point X. Includes diagram2021 · 25 Feb · Shift 1 · Q59 · MCQ
  98. For extrinsic semiconductors; when doping level is increased;2021 · 25 Feb · Shift 2 · Q64 · MCQ
  99. The truth table for the following logic circuit is : Includes diagram2021 · 25 Feb · Shift 2 · Q65 · MCQ
  100. Identify the logic operation carried out. Includes diagram2021 · 25 Jul · Shift 1 · Q49 · MCQ
  101. In a semiconductor, the number density of intrinsic charge carries at 27 ∘ C is 1.5 × 1016/m3. If the semiconductor is doped with impurity atom, the hole density increases to 4.5 × 1022/m3. The electron density in the…2021 · 25 Jul · Shift 2 · Q71 · Numerical
  102. Identify the logic operation carried out by the given circuit :- Includes diagram2021 · 26 Aug · Shift 1 · Q51 · MCQ
  103. Statement I : By doping silicon semiconductor with pentavalent material, the electrons density increases. Statement II : The n-type semiconductor has net negative charge. In the light of the above statements, choose the most appropriate…2021 · 26 Aug · Shift 1 · Q62 · MCQ
  104. Four NOR gates are connected as shown in figure. The truth table for the given figure is : Includes diagram2021 · 26 Aug · Shift 2 · Q58 · MCQ
  105. For the given circuit, the power across Zener diode is .............. mW. Includes diagram2021 · 26 Aug · Shift 2 · Q70 · Numerical
  106. LED is constructed from Ga-As-P semiconducting material. The energy gap of this LED is 1.9 eV. Calculate the wavelength of light emitted and its colour. [h = 6.63 × 10 − 34 Js and c = 3 × 108 ms − 1]2021 · 26 Feb · Shift 1 · Q48 · MCQ
  107. The circuit contains two diodes each with a forward resistance of 50 Ω and with infinite reverse resistance. If the battery voltage is 6V, the current through the 120 Ω resistance is ​ mA. Includes diagram2021 · 26 Feb · Shift 1 · Q65 · Numerical
  108. Draw the output signal Y in the given combination of gates. Includes diagram2021 · 26 Feb · Shift 2 · Q48 · MCQ
  109. The zener diode has a Vz = 30V. The current passing through the diode for the following circuit is ​ mA. Includes diagram2021 · 26 Feb · Shift 2 · Q70 · Numerical
  110. A zener diode of power rating 2W is to be used as a voltage regulator. If the zener diode has a breakdown of 10 V and it has to regulate voltage fluctuated between 6 V and 14 V, the value of Rs for safe operation should be ​Ω… Includes diagram2021 · 27 Aug · Shift 2 · Q61 · Numerical
  111. Find the truth table for the function Y of A and B represented in the following figure. Includes diagram2021 · 27 Jul · Shift 2 · Q54 · MCQ
  112. 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 : Includes diagram2021 · 31 Aug · Shift 1 · Q47 · MCQ
  113. Choose the correct waveform that can represent the voltage across R of the following circuit, assuming the diode is ideal one : Includes diagram2021 · 31 Aug · Shift 1 · Q54 · MCQ
  114. If VA and VB are the input voltages (either 5V or 0V) and V0 is the output voltage then the two gates represented in the following circuit (A) and (B) are :- Includes diagram2021 · 31 Aug · Shift 2 · Q49 · MCQ
  115. Statement - I : To get a steady dc output from the pulsating voltage received from a full wave rectifier we can connect a capacitor across the output parallel to the load RL. Statement - II : To get a steady dc output from the pulsating…2021 · 31 Aug · Shift 2 · Q61 · MCQ
  116. In the following digital circuit, what will be the output at ‘Z’, when the input (A, B) are (1, 0), (0, 0), (1, 1,), (0, 1) Includes diagram2020 · 2 Sep · Shift 2 · Q44 · MCQ
  117. When a diode is forward biased, it has a voltage drop of 0.5 V. The safe limit of current through the diode is 10 mA. If a battery of emf 1.5 V is used in the circuit, the value of minimum resistance to be connected in series with the…2020 · 3 Sep · Shift 1 · Q53 · MCQ
  118. Which of the following will NOT be observed when a multimeter (operating in resistance measuring mode) probes connected across a component, are just reversed?2020 · 3 Sep · Shift 2 · Q58 · MCQ
  119. If a semiconductor photodiode can detect a photon with a maximum wavelength of 400 nm, then its band gap energy is : Planck’s constant h = 6.63 × 10–34 J.s. Speed of light c = 3 × 108 m/s2020 · 3 Sep · Shift 2 · Q59 · MCQ
  120. 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) Includes diagram2020 · 4 Sep · Shift 1 · Q55 · MCQ
  121. Identify the operation performed by the circuit given below : Includes diagram2020 · 4 Sep · Shift 2 · Q51 · MCQ
  122. With increasing biasing voltage of a photodiode, the photocurrent magnitude :2020 · 5 Sep · Shift 1 · Q44 · MCQ
  123. Two Zener diodes (A and B) having breakdown voltages of 6 V and 4 V respectively, are connected as shown in the circuit below. The output voltage V0 variation with input voltage linearly increasing with time, is given by : (Vinput = 0 V at… Includes diagram2020 · 5 Sep · Shift 2 · Q47 · MCQ
  124. Identify the correct output signal Y in the given combination of gates (as shown) for the given inputs A and B. Includes diagram2020 · 6 Sep · Shift 1 · Q39 · MCQ
  125. Which of the following gives a reversible operation?2020 · 7 Jan · Shift 1 · Q50 · MCQ
  126. In the figure, potential difference between A and B is : Includes diagram2020 · 7 Jan · Shift 2 · Q51 · MCQ
  127. Boolean relation at the output stage-Y for the following circuit is : Includes diagram2020 · 8 Jan · Shift 1 · Q59 · MCQ
  128. In the given circuit, value of Y is : Includes diagram2020 · 8 Jan · Shift 2 · Q38 · MCQ
  129. Both the diodes used in the circuit shown are assumed to be ideal and have negligible resistance when these are forward biased. Built in potential in each diode is 0.7 V. For the input voltages shown in the figure, the voltage (in Volts)… Includes diagram2020 · 9 Jan · Shift 1 · Q44 · Numerical
  130. The circuit shown below is working as a 8 V dc regulated voltage source. When 12 V is used as input, the power dissipated (in mW) in each diode is; (considering both zener diodes are identical) ​. Includes diagram2020 · 9 Jan · Shift 2 · Q44 · Numerical
  131. Two identical capacitors A and B, charged to the same potential 5V are connected in two different circuits as shown below at time t = 0. If the charge on capacitors A and B at time t = CR is QA and QB respectively, then (Here e is the base… Includes diagram2020 · 9 Jan · Shift 2 · Q51 · MCQ
  132. The current i in the network is : Includes diagram2020 · 9 Jan · Shift 2 · Q59 · MCQ
  133. The reverse breakdown voltage of a Zener diode is 5.6 V in the given circuit. The current IZ through the Zener is : Includes diagram2019 · 8 Apr · Shift 1 · Q66 · MCQ
  134. The logic gate equivalent to the given logic circuit is :- Includes diagram2019 · 9 Apr · Shift 2 · Q59 · MCQ
  135. Mobility of electrons in a semiconductor is defined as the ratio of their drift velocity to the applied electric field. If, for an n-type semiconductor, the density of electrons is 1019 m − 3 and their mobility is 1.6 m2/(V.s) then the…2019 · 9 Jan · Shift 1 · Q45 · MCQ
  136. Ge and Si diodes start conducting at 0.3 V and 0.7 V respectively. In the following figure if Ge diode connection are reversed, the value of V0 changes by : (assume that the Ge diode has large breakdown voltage) Includes diagram2019 · 9 Jan · Shift 2 · Q51 · MCQ
  137. The figure represents a voltage regulator circuit using a Zener diode. The breakdown voltage of the Zener diode is 6 V and the load resistance is, RL = 4k Ω. The series resistance of the circuit is Ri = 1 k Ω. If the battery… Includes diagram2019 · 10 Apr · Shift 2 · Q60 · MCQ
  138. To get output 1 at R, for the given logic gate circuit the input values must be Includes diagram2019 · 10 Jan · Shift 1 · Q67 · MCQ
  139. For the circuit shown below, the current through the Zener diode is - Includes diagram2019 · 10 Jan · Shift 2 · Q53 · MCQ
  140. In the given circuit the current through Zener Diode is close to: Includes diagram2019 · 11 Jan · Shift 1 · Q47 · MCQ
  141. The circuit shown below contains two ideal diodes, each with a forward resistance of 50 Ω. If the battery voltage is 6 V, the current through the 100 Ω resistance (in Amperes) is : Includes diagram2019 · 11 Jan · Shift 2 · Q45 · MCQ
  142. The truth table for the circuit given in the fig. is: Includes diagram2019 · 12 Apr · Shift 1 · Q53 · MCQ
  143. Figure shows a DC voltage regulator circuit, with a Zener diode of breakdown voltage = 6V. If the unregulated input voltage varies between 10 V to 16 V, then what is maximum Zener current? Includes diagram2019 · 12 Apr · Shift 2 · Q62 · MCQ
  144. The output of the given logic circuit is : Includes diagram2019 · 12 Jan · Shift 1 · Q47 · MCQ
  145. Truth table for the following digital circuit will be : Includes diagram2018 · 15 Apr · Shift 2 · Q49 · MCQ
  146. In the given circuit, the current through zener diode is : Includes diagram2018 · 16 Apr · Shift 1 · Q73 · MCQ
  147. The reading of the ammeter for a silicon diode in the given circuit is : Includes diagram2018 · Shift 0 · Q68 · MCQ
  148. What is the conductivity of a semiconductor sale having electron concentration of 5×1018m−3, hole concentration of 5×1019m−3, electron mobility of 2.0 m2 V − 1 s-1 and hole mobility of…2017 · 8 Apr · Shift 1 · Q53 · MCQ
  149. The V-I characteristic of a diode is shown in the figure. The ratio of forward to reverse bias resistance is : Includes diagram2017 · 8 Apr · Shift 1 · Q73 · MCQ
  150. The truth table given in fig. represents : Includes table2016 · 9 Apr · Shift 1 · Q53 · MCQ
  151. An experiment is performed to determine the I - V characteristics of a Zener diode, which has a protective resistance of R = 100 Ω, and a maximum power of dissipation rating of 1 W. The minimum voltage range of the DC source in the…2016 · 9 Apr · Shift 1 · Q73 · MCQ
  152. To get an output of 1 from the circuit shown in figure the input must be : Includes diagram2016 · 10 Apr · Shift 1 · Q63 · MCQ
  153. Identify the semiconductor devices whose characteristics are given below, in the order (a),(b),(c),(d) : Includes diagram2016 · Shift 0 · Q38 · MCQ
  154. If a,b,c,d are inputs to a gate and x is its output, then, as per the following time graph, the gate is : Includes diagram2016 · Shift 0 · Q39 · MCQ
  155. The temperature dependence of resistance of Cu and undoped Si in the temperature range 300−400K, is best described by :2016 · Shift 0 · Q49 · MCQ
  156. A red LED emits light at 0.1 watt uniformly around it. The amplitude of the electric field of the light at a distance of 1m from the diode is :2015 · Shift 0 · Q44 · MCQ
  157. The current voltage relation of diode is given by I=(e100V/T−1)mA, where the applied voltage V is in volts and the temperature T is in degree kelvin. If a student makes an error measuring ±0.01V…2014 · Shift 0 · Q45 · MCQ
  158. The forward biased diode connection is:2014 · Shift 0 · Q46 · MCQ
  159. The I-V characteristic of an LED is2013 · Shift 0 · Q49 · MCQ
  160. A diode detector is used to detect an amplitude modulated wave of 60% modulation by using a condenser of capacity 250 picofarad in parallel with a load resistance 100 kilo ohm. Find the maximum modulated frequency which could be… Includes diagram2013 · Shift 0 · Q53 · MCQ
  161. Truth table for system of four NAND gates as shown in figure is: Includes diagram2012 · Shift 0 · Q45 · MCQ
  162. The combination of gates shown below yields Includes diagram2010 · Shift 0 · Q51 · MCQ
  163. The logic circuit shown below has the input waveforms ′A′ and ′B′ as shown. Pick out the correct output waveform. Output is Includes diagram2009 · Shift 0 · Q48 · MCQ
  164. 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 : Includes diagram2009 · Shift 0 · Q49 · MCQ
  165. In the circuit below, A and B represent two inputs and C represents the output. The circuit represents Includes diagram2008 · Shift 0 · Q57 · MCQ
  166. If in a p-n junction diode, a square input signal of 10V is applied as shown Then the output signal across RL​ will be Includes diagram2007 · Shift 0 · Q64 · MCQ
  167. Carbon, silicon and germanium have four valence electrons each. At room temperature which one of the following statements is most appropriate ?2007 · Shift 0 · Q65 · MCQ
  168. If the ratio of the concentration of electrons to that of holes in a semiconductor is 57​ and the ratio of currents is 47​, then what is the ratio of their drift velocities?2006 · Shift 0 · Q100 · MCQ
  169. A solid which is not transparent to visible light and whose conductivity increases with temperature is formed by2006 · Shift 0 · Q102 · MCQ
  170. The circuit has two oppositively connected ideal diodes in parallel. What is the current following in the circuit? Includes diagram2006 · Shift 0 · Q84 · MCQ
  171. In the following, which one of the diodes is reverse biased?2006 · Shift 0 · Q85 · MCQ
  172. If the lattice constant of this semiconductor is decreased, then which of the following is correct? Includes diagram2006 · Shift 0 · Q87 · MCQ
  173. In a full wave rectifier circuit operating from 50Hz mains frequency, the fundamental frequency in the ripple would be2005 · Shift 0 · Q116 · MCQ
  174. The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than 2480nm is incident on it. The band gap in (eV) for the semiconductor is2005 · Shift 0 · Q139 · MCQ
  175. The manifestation of band structure in solids is due to2004 · Shift 0 · Q117 · MCQ
  176. A piece of copper and another of germanium are cooled from room temperature to 77K, the resistance of2004 · Shift 0 · Q125 · MCQ
  177. When p-n junction diode is forward biased then2004 · Shift 0 · Q127 · MCQ
  178. In the middle of the depletion layer of a reverse- biased p-n junction, the2003 · Shift 0 · Q124 · MCQ
  179. A strip of copper and another of germanium are cooled from room temperature to 80K. The resistance of2003 · Shift 0 · Q142 · MCQ
  180. The difference in the variation of resistance with temperature in a metal and a semiconductor arises essentially due to the difference in the2003 · Shift 0 · Q143 · MCQ
  181. The energy band gap is maximum in2002 · Shift 0 · Q115 · MCQ
  182. At absolute zero, Si acts as2002 · Shift 0 · Q136 · MCQ
  183. By increasing the temperature, the specific resistance of a conductor and a semiconductor2002 · Shift 0 · Q139 · MCQ