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The p-n Junction Diode · CAPE Physics Unit 2

109 past-paper questions on The p-n Junction Diode, part of AC Theory and Electronics, from every CAPE Physics Unit 2 paper on Quelpr.

Practise The p-n Junction Diode
  1. 4(c)(i)2 marks· CAPE Physics Unit 2 · 2001 · Paper 1Sketch a graph to show how the current varies as it flows through the resistor.
  2. 4(c)(ii)1 mark· CAPE Physics Unit 2 · 2001 · Paper 1To smoothen the rectified potential difference across the resistor, a capacitor is placed in the circuit of Figure 5. Indicate on Figure 5 where you would place this capacitor.
  3. 4(c)(iii)1 mark· CAPE Physics Unit 2 · 2001 · Paper 1Show on the graph sketched in part (c)(i) the effect on the current of placing the capacitor in the circuit.
  4. 4(c)(iv)1 mark· CAPE Physics Unit 2 · 2001 · Paper 1On the sketched graph, label the region where the capacitor is being charged.
  5. 5(a)(i)1 mark· CAPE Physics Unit 2 · 2002 · Paper 1What type of semiconductor is produced by doping an intrinsic semiconductor with donor atoms?
  6. 5(a)(ii)1 mark· CAPE Physics Unit 2 · 2002 · Paper 1What are the majority charge carriers in a p-type semiconductor?
  7. 5(a)(iii)2 marks· CAPE Physics Unit 2 · 2002 · Paper 1Explain the origin of the diffusion current in a semiconductor.
  8. 5(b)(i)1 mark· CAPE Physics Unit 2 · 2002 · Paper 1Explain what is meant by the 'depletion layer of a pn-junction'.
  9. 5(b)(ii)2 marks· CAPE Physics Unit 2 · 2002 · Paper 1Explain how the depletion layer is formed.
  10. 5(b)(iii)1 mark· CAPE Physics Unit 2 · 2002 · Paper 1Draw one arrow on Figure 7 to show the direction of the diffusion current.
  11. 5(b)(iv)1 mark· CAPE Physics Unit 2 · 2002 · Paper 1On Figure 7, use the symbol for a cell to complete a circuit showing how the pn-junction is connected in the forward bias connection.
  12. 5(b)(v)1 mark· CAPE Physics Unit 2 · 2002 · Paper 1Explain why the forward bias circuit completed in (b)(iv) allows an appreciable current to flow.
  13. 6(c)(i)4 marks· CAPE Physics Unit 2 · 2002 · Paper 1Calculate the y-plate sensitivity of the c.r.o.
  14. 6(c)(ii)1 mark· CAPE Physics Unit 2 · 2002 · Paper 1Explain how the waveform shown in Figure 9 could be 'smoothed'.
  15. 2(a)(i)4 marks· CAPE Physics Unit 2 · 2002 · Paper 2Draw a circuit diagram to show how to achieve full-wave rectification using four diodes.
  16. 2(a)(ii)2 marks· CAPE Physics Unit 2 · 2002 · Paper 2Explain how this circuit can be modified to provide half-wave rectification.
  17. 2(b)(i)2 marks· CAPE Physics Unit 2 · 2002 · Paper 2Briefly describe what happens to D1 and D2 as 1 cycle of voltage Vs is applied to the circuit.
  18. 2(b)(ii)1 mark· CAPE Physics Unit 2 · 2002 · Paper 2Sketch the waveform expected on the cathode ray oscilloscope (c.r.o.) across the output Vo.
  19. 2(b)(iii)1 mark· CAPE Physics Unit 2 · 2002 · Paper 2Compare the output waveforms from 2(a)(i) and 2(b)(i).
  20. 4(a)(i)1 mark· CAPE Physics Unit 2 · 2003 · Paper 1Explain what is meant by a P-type semiconductor.
  21. 4(a)(ii)1 mark· CAPE Physics Unit 2 · 2003 · Paper 1Explain what is meant by an N-type semiconductor.
  22. 4(a)(iii)1 mark· CAPE Physics Unit 2 · 2003 · Paper 1Explain what is meant by doping, as applied to semiconductors.
  23. 4(a)(iv)1 mark· CAPE Physics Unit 2 · 2003 · Paper 1Explain what is meant by the depletion region.
  24. 4(b)1 mark· CAPE Physics Unit 2 · 2003 · Paper 1Suggest ONE application of a p-n junction diode.
  25. 4(c)(i)a)2 marks· CAPE Physics Unit 2 · 2003 · Paper 1Calculate the value of the output voltage, V_0, when V_i = 10 V.
  26. 4(c)(i)b)1 mark· CAPE Physics Unit 2 · 2003 · Paper 1Calculate the value of the output voltage, V_0, when V_i = -10.0 V.
  27. 4(c)(ii)2 marks· CAPE Physics Unit 2 · 2003 · Paper 1Sketch the output when V_i = 10 sin(omega * t), where omega = 100 rad s^-1, including appropriate numerical values on the scales.
  28. 1(a)(i)2 marks· CAPE Physics Unit 2 · 2003 · Paper 2Draw a circuit diagram suitable for examining the I - V characteristic of the diode.
  29. 1(a)(ii)2 marks· CAPE Physics Unit 2 · 2003 · Paper 2Explain how the readings would be taken.
  30. 1(b)(i)4 marks· CAPE Physics Unit 2 · 2003 · Paper 2Assuming that I = A V^n, use the graph in Figure 1 to determine the value of n.
  31. 1(b)(ii)2 marks· CAPE Physics Unit 2 · 2003 · Paper 2Deduce the FULL equation relating the current, I, to the voltage, V, for the diode.
  32. 4(a)(i)1 mark· CAPE Physics Unit 2 · 2004 · Paper 1Explain what is meant by an n-type semiconductor.
  33. 4(a)(ii)1 mark· CAPE Physics Unit 2 · 2004 · Paper 1Explain what is meant by a p-type semiconductor.
  34. 2(b)(i)1 mark· CAPE Physics Unit 2 · 2004 · Paper 2Complete the design of the circuit on the diagram to achieve this objective using all given components.
  35. 2(b)(ii)2 marks· CAPE Physics Unit 2 · 2004 · Paper 2Sketch on Figure 2b the output voltage that would be seen on the oscilloscope.
  36. 5(a)(i)2 marks· CAPE Physics Unit 2 · 2005 · Paper 1Sketch the I-V characteristic curve for such a diode.
  37. 5(a)(ii)1 mark· CAPE Physics Unit 2 · 2005 · Paper 1Explain what is meant by the depletion layer at a pn junction and indicate this layer on Figure VI.
  38. 5(a)(iii)a)1 mark· CAPE Physics Unit 2 · 2005 · Paper 1Indicate on Figure VI the direction of the diffusion current by labeling an arrow with an X.
  39. 5(a)(iii)b)1 mark· CAPE Physics Unit 2 · 2005 · Paper 1Indicate on Figure VI the direction of the drift current by labeling an arrow with a Y.
  40. 5(a)(iv)2 marks· CAPE Physics Unit 2 · 2005 · Paper 1The switch in Figure VI is now closed. Describe how the depletion layer is affected and explain the effect.
  41. 5(b)3 marks· CAPE Physics Unit 2 · 2005 · Paper 1For each circuit in Figure VII, (ii)-(iv), sketch the output voltage as seen on the cathode ray oscilloscope on the axes beside the circuit diagram.
  42. 7(d)(i)2 marks· CAPE Physics Unit 2 · 2006 · Paper 2State which diodes conduct when terminal X is positive with respect to terminal Y.
  43. Q161 mark · multiple choice· CAPE Physics Unit 2 · 2007 · Paper 1The MAJORITY charge carriers in an n-type material are
  44. Q171 mark · multiple choice· CAPE Physics Unit 2 · 2007 · Paper 1The circuits below contain diodes, a cell, resistors and an ammeter. In which circuit will the ammeter register a current?
  45. 6(a)(i)2 marks· CAPE Physics Unit 2 · 2007 · Paper 2Explain the term 'depletion region' and state how it is formed.
  46. 6(a)(ii)3 marks· CAPE Physics Unit 2 · 2007 · Paper 2Draw a diagram showing the p-n junction under forward bias, indicate the direction of current I_D, and comment on the thickness of the depletion region.
  47. 6(a)(iii)3 marks· CAPE Physics Unit 2 · 2007 · Paper 2Explain why a significant current flows under forward bias whereas the current is virtually zero under reverse bias.
  48. 6(c)(i)2 marks· CAPE Physics Unit 2 · 2007 · Paper 2Find the peak value of the potential difference across the 1 kΩ resistor.
  49. 6(c)(ii)1 mark· CAPE Physics Unit 2 · 2007 · Paper 2Calculate the peak value of the current I through the 1 kΩ resistor.
  50. 6(c)(iii)4 marks· CAPE Physics Unit 2 · 2007 · Paper 2Sketch the waveforms for V_i, I, and V_R using the same time scale, with each full cycle spanning at least 8 cm on the time axis.
  51. Q171 mark · multiple choice· CAPE Physics Unit 2 · 2007 (Specimen) · Paper 1Which of the graphs below BEST represent the I - V characteristics of a silicon p-n junction diode.
  52. Q201 mark · multiple choice· CAPE Physics Unit 2 · 2007 (Specimen) · Paper 1Which of the traces below will be seen on the cathode ray oscilloscopes in Figure 1 and Figure 2 above?
  53. Q161 mark · multiple choice· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 1Which of the following graphs shows how the current varies with time for the circuit shown above?
  54. Q171 mark · multiple choice· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 1Which of the following represents a possible direction of current flow for the bridge rectifier?
  55. Q191 mark · multiple choice· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 1When a battery is connected across it in the forward bias direction, the depletion layer
  56. Q201 mark · multiple choice· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 1The diagram above represents
  57. Q161 mark · multiple choice· CAPE Physics Unit 2 · 2008 (T&T) · Paper 1With which of the following devices is the depletion layer associated?
  58. Q191 mark · multiple choice· CAPE Physics Unit 2 · 2009 · Paper 1Item 19 refers to the following diagram. Which ONE of the following traces will be seen on the cathode ray oscilloscope connected across AB if diode B is defective and does NOT conduct in any direction?
  59. 1(c)(i)3 marks· CAPE Physics Unit 2 · 2009 · Paper 2Use the data presented in Figure 1 to determine the value of n in the relation I = k * V^n.
  60. 1(c)(ii)2 marks· CAPE Physics Unit 2 · 2009 · Paper 2Deduce the actual equation relating current, I, to voltage, V, for this diode.
  61. 1(c)(iii)2 marks· CAPE Physics Unit 2 · 2009 · Paper 2Calculate the d.c. resistance of the diode at I = 0.32 A.
  62. 1(c)(iv)2 marks· CAPE Physics Unit 2 · 2009 · Paper 2Suggest an improved method of processing the experimental data to determine the values of n and k.
  63. Q181 mark · multiple choice· CAPE Physics Unit 2 · 2010 · Paper 1In which of the circuits below is the capacitor connected to give a smooth rectified output voltage across the load (R)?
  64. Q191 mark · multiple choice· CAPE Physics Unit 2 · 2010 · Paper 1Which of the following graphs represents the output across R_L?
  65. 2(a)(i)a)1 mark· CAPE Physics Unit 2 · 2010 · Paper 2Explain what is meant by P-type material.
  66. 2(a)(i)b)1 mark· CAPE Physics Unit 2 · 2010 · Paper 2Explain what is meant by N-type material.
  67. 2(a)(i)c)1 mark· CAPE Physics Unit 2 · 2010 · Paper 2Explain what is meant by the depletion region.
  68. 2(a)(ii)2 marks· CAPE Physics Unit 2 · 2010 · Paper 2Draw a diagram of a junction transistor and draw the transistor symbol.
  69. 2(b)(i)1 mark· CAPE Physics Unit 2 · 2010 · Paper 2Complete Table 2 by filling in the missing values of ln(I / μA).
  70. 2(b)(ii)4 marks· CAPE Physics Unit 2 · 2010 · Paper 2Plot a graph of ln I versus V on the grid opposite and draw your best straight line through the points.
  71. 2(b)(iii)1 mark· CAPE Physics Unit 2 · 2010 · Paper 2Write the equation relating ln I and V.
  72. 2(b)(iv)4 marks· CAPE Physics Unit 2 · 2010 · Paper 2Determine the ideality factor n using data: k = 1.38 × 10⁻²³ J K⁻¹ and elementary charge e = 1.60 × 10⁻¹⁹ C at T = 300 K.
  73. Q181 mark · multiple choice· CAPE Physics Unit 2 · 2011 · Paper 1In the diagram above, the current (I) flowing through the n-type semiconductor is mainly due to
  74. Q191 mark · multiple choice· CAPE Physics Unit 2 · 2011 · Paper 1Which of the lamps in the circuit shown above are lit?
  75. Q201 mark · multiple choice· CAPE Physics Unit 2 · 2011 · Paper 1Which of the graphs below describes the output of the circuit shown above?
  76. Q181 mark · multiple choice· CAPE Physics Unit 2 · 2012 · Paper 1In which of the circuits below is the capacitor connected to give a smooth rectified output voltage across the load (R)?
  77. Q191 mark · multiple choice· CAPE Physics Unit 2 · 2012 · Paper 1Which of the following diagrams shows the correct arrangement for a full wave rectifier circuit?
  78. Q191 mark · multiple choice· CAPE Physics Unit 2 · 2013 · Paper 1In which of the circuits below is the capacitor connected to give a smooth rectified output voltage across the load (R)?
  79. Q171 mark · multiple choice· CAPE Physics Unit 2 · 2014 · Paper 1In a p-type semiconductor, the majority charge carriers are
  80. Q211 mark · multiple choice· CAPE Physics Unit 2 · 2014 · Paper 1Which of the following devices is associated with a depletion layer?
  81. 2(a)3 marks· CAPE Physics Unit 2 · 2014 · Paper 2On the grid provided, draw a fully labelled sketch of the reverse bias I-V characteristic of a typical silicon p-n junction diode.
  82. 2(b)(i)3 marks· CAPE Physics Unit 2 · 2014 · Paper 2Complete Column 3 of Table 2 by calculating \ln(I_D).
  83. 2(b)(ii)5 marks· CAPE Physics Unit 2 · 2014 · Paper 2On the grid provided on page 11, draw a graph of \ln(I_D) vs V_D / V_T.
  84. 2(b)(iii)4 marks· CAPE Physics Unit 2 · 2014 · Paper 2Use your graph to calculate the reverse saturation current for this diode.
  85. Q81 mark · multiple choice· CAPE Physics Unit 2 · 2016 · Paper 1Which of the following materials does the I\text{–}V graph BEST represent?
  86. 4(c)(iii)2 marks· CAPE Physics Unit 2 · 2016 · Paper 2Would the drift velocity in a semiconductor material of similar dimensions carrying the same current be greater than that of the conductor in (c)(i)? State a reason for your answer.
  87. 5(a)(i)6 marks· CAPE Physics Unit 2 · 2016 · Paper 2With the aid of a diagram, explain the operation of a simple half-wave rectifier circuit which employs a junction diode. Indicate the polarity of the output voltage on the diagram.
  88. 5(a)(ii)1 mark· CAPE Physics Unit 2 · 2016 · Paper 2Sketch the output voltage when the input is a sine wave.
  89. 5(c)3 marks· CAPE Physics Unit 2 · 2016 · Paper 2Draw a labelled sketch (do not plot) showing the correct values of amplitude and period for two cycles of the output voltage when this waveform is applied to a simple half-wave rectifier circuit.
  90. Q31 mark · multiple choice· CAPE Physics Unit 2 · 2017 · Paper 1Which of the following graphs represents the correct relationship between voltage and current for a practical silicon p-n junction diode?
  91. Q221 mark · multiple choice· CAPE Physics Unit 2 · 2017 · Paper 1Item 22 refers to the following diagram which shows the output voltage across the load in a bridge rectifier. [Waveform showing full-wave rectified DC voltage] Which of the following can be done to produce a steadier…
  92. Q251 mark · multiple choice· CAPE Physics Unit 2 · 2017 · Paper 1Item 25 refers to the following diagram. [Diagram showing a p-n junction with a depletion layer connected to a DC cell and switch S in reverse bias] When the switch S is closed, the depletion layer
  93. 5(a)3 marks· CAPE Physics Unit 2 · 2017 · Paper 2Explain what is meant by a 'semiconductor' and state typical values for its resistivity.
  94. 5(b)5 marks· CAPE Physics Unit 2 · 2017 · Paper 2With the aid of diagrams, describe how a depletion layer forms at an unbiased p-n junction, specifying the conditions under which its formation begins and ceases.
  95. 5(c)(i)1 mark· CAPE Physics Unit 2 · 2017 · Paper 2Deduce the value of the output voltage V_out when V_in = 0.5 V.
  96. 5(c)(ii)2 marks· CAPE Physics Unit 2 · 2017 · Paper 2Explain your answer to part (c)(i).
  97. 5(c)(iii)1 mark· CAPE Physics Unit 2 · 2017 · Paper 2Deduce the value of the output voltage and the diode current when V_in = 2.0 V.
  98. 5(c)(iv)3 marks· CAPE Physics Unit 2 · 2017 · Paper 2Explain the answer given in part (c)(iii).
  99. Q191 mark · multiple choice· CAPE Physics Unit 2 · 2018 · Paper 1Which of the following diagrams shows the correct arrangement for a full-wave rectifier circuit?
  100. Q221 mark · multiple choice· CAPE Physics Unit 2 · 2019 · Paper 1Item 22 refers to the following diagram which shows the output voltage across the load in a bridge rectifier. Which of the following can be done to produce a steadier d.c. voltage across the load shown above?
  101. Q271 mark · multiple choice· CAPE Physics Unit 2 · 2019 · Paper 1Item 27 refers to the following circuit diagram. In the diagram above, the current, I, flowing through the n-type semiconductor is mainly due to
  102. 2(c)3 marks· Physics · Unit 2 Q2 2(c)On the graph shown in Figure 2 on page 10, sketch the output voltage for ONE cycle given that there is a volt drop of 0.7 volts across the diode, D, when it is conducting.
  103. 2(c)(i)2 marks· Physics · Unit 2 Q2 2(c)(i)Use Figure 2 to determine the times in the given cycle at which the diode in Figure 4 starts and stops conducting.
  104. 2(c)(ii)2 marks· Physics · Unit 2 Q2 2(c)(ii)Determine the peak voltage across the load in Figure 4.
  105. 2(c)(iii)1 mark· Physics · Unit 2 Q2 2(c)(iii)In the space provided below, sketch ONE cycle of the output voltage across the load in Figure 4 on page 13.
  106. 2(d)6 marks· Physics · Unit 2 Q2 2(d)Sketch and label BEFORE and AFTER diagrams to describe the formation of the depletion layer in an unbiased p-n junction.
  107. 2(d)4 marks· Physics · Unit 2 Q2 2(d)Complete the circuit in Figure 4 by inserting diodes at D1, D2, D3 and D4, with orientation matching the polarity of the output terminals.
  108. 2(e)2 marks· Physics · Unit 2 Q2 2(e)On Figure 4, draw arrows to show the direction of current flow for the first half of the cycle, consistent with the polarity of the output terminals.
  109. 2(f)2 marks· Physics · Unit 2 Q2 2(f)Given that the input to the full-wave bridge rectifier in Figure 4 is that shown in Figure 2, determine the amplitude and frequency of the fully rectified wave form, assuming that the diodes are ideal.

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