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Logic Gates · CAPE Physics Unit 2

169 past-paper questions on Logic Gates, part of AC Theory and Electronics, from every CAPE Physics Unit 2 paper on Quelpr.

Practise Logic Gates
  1. 6(a)5 marks· CAPE Physics Unit 2 · 2001 · Paper 1Draw a truth table for the logic network shown in Figure 6.
  2. 6(b)3 marks· CAPE Physics Unit 2 · 2001 · Paper 1Design a logic network using a combination of AND and NOR gates to give the same output as in part (a).
  3. 6(c)2 marks· CAPE Physics Unit 2 · 2001 · Paper 1Name and draw the single gate which is equivalent to the network.
  4. 6(a)1 mark· CAPE Physics Unit 2 · 2001 · Paper 2Write down the truth table for the Exclusive-OR (EX-OR) gate.
  5. 6(b)(i)3 marks· CAPE Physics Unit 2 · 2001 · Paper 2Construct the truth table for the circuit shown in Figure 3.
  6. 6(b)(ii)2 marks· CAPE Physics Unit 2 · 2001 · Paper 2Describe in words the logic function of the circuit shown in Figure 3.
  7. 6(c)(i)2 marks· CAPE Physics Unit 2 · 2001 · Paper 2Using the EX-OR gate, draw a circuit of a half-adder showing clearly the inputs A and B and the outputs of the circuit.
  8. 6(c)(ii)3 marks· CAPE Physics Unit 2 · 2001 · Paper 2Show how the full-adder circuit can be implemented from two half-adder circuits.
  9. 6(d)9 marks· CAPE Physics Unit 2 · 2001 · Paper 2Show the block diagram and explain the operation for the addition of the two binary numbers 110 and 101 using adders.
  10. 6(a)1 mark· CAPE Physics Unit 2 · 2002 · Paper 1State what is understood by a 'logic gate'.
  11. 6(b)(i)2 marks· CAPE Physics Unit 2 · 2002 · Paper 1Write down the truth table for the circuit.
  12. 6(b)(ii)1 mark· CAPE Physics Unit 2 · 2002 · Paper 1Draw the single logic gate which produces the output specified in (b)(i).
  13. 6(b)(iii)1 mark· CAPE Physics Unit 2 · 2002 · Paper 1Give the name of the logic gate drawn in part (b)(ii).
  14. 7(b)(i)2 marks· CAPE Physics Unit 2 · 2002 · Paper 2Distinguish between an analogue circuit and a digital circuit.
  15. 7(b)(ii)1 mark· CAPE Physics Unit 2 · 2002 · Paper 2Write the truth table for a NAND gate.
  16. 7(b)(iii)3 marks· CAPE Physics Unit 2 · 2002 · Paper 2Determine the output waveform X for the NAND gate circuit shown in Figure 11 when inputs A and B are applied.
  17. 7(c)(i)4 marks· CAPE Physics Unit 2 · 2002 · Paper 2A room lamp is controlled by switches at the front and back doors: the lamp is ON if exactly one switch is ON, and OFF if both are OFF or both are ON. Draw a logic circuit to meet these requirements, showing the…
  18. 7(c)(ii)3 marks· CAPE Physics Unit 2 · 2002 · Paper 2Using two OR gates, one AND gate, and three INVERTERs, show how to design a half adder circuit.
  19. 7(c)(iii)2 marks· CAPE Physics Unit 2 · 2002 · Paper 2Draw the resulting truth table for the sum and carry outputs of the half adder.
  20. 6(a)(i)2 marks· CAPE Physics Unit 2 · 2003 · Paper 1Write the truth table for a half-adder used to add the 1's column in binary addition.
  21. 6(a)(ii)2 marks· CAPE Physics Unit 2 · 2003 · Paper 1Draw a circuit diagram to show how an Exclusive-OR (EX-OR) gate and an AND gate can be arranged to design a half adder circuit.
  22. 6(b)1 mark· CAPE Physics Unit 2 · 2003 · Paper 1Draw a circuit diagram to show how NAND gates could be used to build a flip-flop.
  23. 6(c)3 marks· CAPE Physics Unit 2 · 2003 · Paper 1Write the truth table for the circuit shown in Figure 6, indicating the output at X, Y and Z.
  24. 6(d)2 marks· CAPE Physics Unit 2 · 2003 · Paper 1Draw a simple logic circuit to represent the truth table shown in which A and B are inputs and X is the output.
  25. 7(a)(i)2 marks· CAPE Physics Unit 2 · 2004 · Paper 2Construct the truth tables for the AND gate and the Exclusive-OR (EX-OR) gate.
  26. 7(a)(ii)4 marks· CAPE Physics Unit 2 · 2004 · Paper 2Construct the truth table for the circuit in Figure 7a and state whether or not the circuit will work.
  27. 7(b)(i)3 marks· CAPE Physics Unit 2 · 2004 · Paper 2Explain the operation of the Half-Adder.
  28. 7(b)(ii)3 marks· CAPE Physics Unit 2 · 2004 · Paper 2Copy the waveforms A and B from Figure 7b into your answer booklet and carefully sketch the resulting output waveforms S and C directly underneath.
  29. 7(b)(iii)5 marks· CAPE Physics Unit 2 · 2004 · Paper 2Draw a circuit to implement a Full-Adder using the half-adder circuit shown in Figure 7b, and explain its operation.
  30. 7(b)(iv)3 marks· CAPE Physics Unit 2 · 2004 · Paper 2Determine the sum output, S, and carry output, C_out, for the Full-Adder inputs shown in Figure 7c.
  31. 6(a)(i)2 marks· CAPE Physics Unit 2 · 2005 · Paper 1List TWO general areas in which digital electronics is commonly employed.
  32. 6(a)(ii)1 mark· CAPE Physics Unit 2 · 2005 · Paper 1Write down the truth table for the EXCLUSIVE-OR (X-OR) gate.
  33. 6(a)(iii)1 mark· CAPE Physics Unit 2 · 2005 · Paper 1Explain how an X-OR gate can be used to detect when TWO binary digits are different.
  34. 6(b)(i)2 marks· CAPE Physics Unit 2 · 2005 · Paper 1Complete the truth table to show the outputs at Y and Z.
  35. 6(b)(ii)3 marks· CAPE Physics Unit 2 · 2005 · Paper 1Sketch, in the space provided in Figure VIII, the output waveform at X, Y and Z if the input waveforms A and B are as indicated.
  36. 6(b)(iii)1 mark· CAPE Physics Unit 2 · 2005 · Paper 1What single logic gate is equivalent to the circuit in Figure VIII?
  37. 7(a)(i)1 mark· CAPE Physics Unit 2 · 2005 · Paper 2What is the name given to this type of circuit?
  38. 7(a)(ii)2 marks· CAPE Physics Unit 2 · 2005 · Paper 2Name the logic gate used in the circuit and write out its truth table.
  39. 7(a)(iii)2 marks· CAPE Physics Unit 2 · 2005 · Paper 2Copy and complete the sequential truth table (Table 4) to show the action of the circuit in Figure VIII.
  40. 7(a)(iv)3 marks· CAPE Physics Unit 2 · 2005 · Paper 2By considering the role of feedback in this circuit and the condition for the gate to have a logic 0 output, explain why the output does not change when the input changes in the second step of the sequence (Row 2) in…
  41. 7(b)(i)1 mark· CAPE Physics Unit 2 · 2005 · Paper 2Before going to bed the householder closes the window and presses and releases the reset switch. Making reference to the sequential truth table in 7(a)(iii), explain how this 'sets' the alarm so that it is ready to be…
  42. 7(b)(ii)1 mark· CAPE Physics Unit 2 · 2005 · Paper 2Why does the alarm sound when a burglar opens the window?
  43. 7(b)(iii)1 mark· CAPE Physics Unit 2 · 2005 · Paper 2Explain why the alarm stays on even when the burglar closes the window.
  44. 7(b)(iv)1 mark· CAPE Physics Unit 2 · 2005 · Paper 2How does the householder turn off the alarm?
  45. 7(c)(i)4 marks· CAPE Physics Unit 2 · 2005 · Paper 2Draw the circuit for a half-adder. Explain, with the aid of a truth table, what its function is and how it performs that function.
  46. 7(c)(ii)4 marks· CAPE Physics Unit 2 · 2005 · Paper 2Draw a table to show the outputs at points P, Q, R and S for the input states: A. I_1 = 1, I_2 = 0, I_3 = 1; B. I_1 = 1, I_2 = 1, I_3 = 1.
  47. 5(a)3 marks· CAPE Physics Unit 2 · 2006 · Paper 1Draw a circuit diagram to show how a half-adder is constructed using three logic gates, and complete the truth table for its operation.
  48. 5(b)2 marks· CAPE Physics Unit 2 · 2006 · Paper 1Complete the block diagram to show how two half-adders and an additional logic gate are interconnected to form a full-adder.
  49. 5(c)(i)3 marks· CAPE Physics Unit 2 · 2006 · Paper 1Complete the truth table for the circuit shown in Figure 5 consisting of gates W, X, and Y.
  50. 5(c)(ii)2 marks· CAPE Physics Unit 2 · 2006 · Paper 1State the name and draw the standard symbol of the single logic gate that is equivalent to this circuit.
  51. 7(a)(i)1 mark· CAPE Physics Unit 2 · 2006 · Paper 2Name an item found in the home which is controlled by a microprocessor.
  52. 7(a)(ii)1 mark· CAPE Physics Unit 2 · 2006 · Paper 2State the function of the microprocessor in the item you have named.
  53. 7(a)(iii)2 marks· CAPE Physics Unit 2 · 2006 · Paper 2State TWO benefits resulting from the use of microprocessors.
  54. 7(b)(i)3 marks· CAPE Physics Unit 2 · 2006 · Paper 2Identify the logic gates shown in Figure 9 and write out their respective truth tables.
  55. 7(b)(ii)3 marks· CAPE Physics Unit 2 · 2006 · Paper 2Draw the truth table for the entire circuit shown in Figure 9 and state its function.
  56. 7(c)(i)1 mark· CAPE Physics Unit 2 · 2006 · Paper 2Write the truth table for the circuit.
  57. 7(c)(ii)3 marks· CAPE Physics Unit 2 · 2006 · Paper 2Draw the logic circuit which uses only NAND gates and a single led to indicate logic 1 output.
  58. 7(c)(iii)1 mark· CAPE Physics Unit 2 · 2006 · Paper 2What single logic gate is the circuit in (c)(ii) equivalent to?
  59. Q271 mark · multiple choice· CAPE Physics Unit 2 · 2007 · Paper 1The circuit is equivalent to
  60. Q291 mark · multiple choice· CAPE Physics Unit 2 · 2007 · Paper 1How many inputs and outputs does a half adder have?
  61. Q301 mark · multiple choice· CAPE Physics Unit 2 · 2007 · Paper 1Choose the response which will BEST complete the following statement. A flip-flop has two output states,
  62. 6(b)(i)1 mark· CAPE Physics Unit 2 · 2007 · Paper 2Identify which segments of the display must be grounded to display the digit 2.
  63. 7(a)(i)2 marks· CAPE Physics Unit 2 · 2007 · Paper 2Draw up the truth tables for a 2-input NOR gate and a 2-input NAND gate.
  64. 7(a)(ii)2 marks· CAPE Physics Unit 2 · 2007 · Paper 2Show how a NAND gate can be constructed using only the four NOR gates of a quad-NOR integrated circuit.
  65. 7(a)(iii)3 marks· CAPE Physics Unit 2 · 2007 · Paper 2In a two-door car, each door switch outputs logic 1 only when properly closed. A warning light must illuminate if either door is not closed. Construct a truth table for this system and draw the circuit diagram using an…
  66. 7(b)(i)3 marks· CAPE Physics Unit 2 · 2007 · Paper 2Draw the logic circuit diagram for an S-R flip-flop and describe how the output can remain unchanged despite changes in the input state.
  67. 7(b)(ii)3 marks· CAPE Physics Unit 2 · 2007 · Paper 2Copy and complete Table 4 showing the logic states at outputs X, Y, and Z for clock pulses 0 through 4, given all outputs start at zero.
  68. Q231 mark · multiple choice· CAPE Physics Unit 2 · 2007 (Specimen) · Paper 1Which one of the following combinations gives the truth table shown above?
  69. Q281 mark · multiple choice· CAPE Physics Unit 2 · 2007 (Specimen) · Paper 1Which of the following gates is equivalent to the combination above?
  70. Q291 mark · multiple choice· CAPE Physics Unit 2 · 2007 (Specimen) · Paper 1If A = 1 and B = 0, what are the values of the outputs X and Y?
  71. Q301 mark · multiple choice· CAPE Physics Unit 2 · 2007 (Specimen) · Paper 1Which of the following statements about a flip-flop is/are correct? I. It contains 2 cross-linked NAND or NOR gates II. It has 2 input and 2 stable output states III. It has 2 input and one stable output state.
  72. Q241 mark · multiple choice· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 1Which of the following represents the digital signal?
  73. Q251 mark · multiple choice· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 1The signal below shows the input to two T-type bistables in series which are triggered by a downward pulse. The correct sequence for outputs X and Y is
  74. Q271 mark · multiple choice· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 1If the inputs at P, Q and R in the combination above are all at logic 1, what are the logic states of X, Y and Z?
  75. Q281 mark · multiple choice· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 1The correct truth table for component X is
  76. Q291 mark · multiple choice· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 1If the inputs to P and Q are both held at logic 1 then the states of R, S and T are
  77. Q301 mark · multiple choice· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 1The symbol for the logic gate which has the equivalent action to this complete circuit is
  78. 2(a)(i)1 mark· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 2Draw a diagram showing how a NOT gate can be constructed using parts of this chip.
  79. 2(a)(ii)1 mark· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 2Draw a diagram showing how an AND gate can be constructed using parts of this chip.
  80. 2(a)(iii)1 mark· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 2Draw a diagram showing how an OR gate can be constructed using parts of this chip.
  81. 2(b)(i)4 marks· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 2Complete the truth table for the circuit shown in Figure 2 for intermediate points C, D, E, F and output Q.
  82. 2(b)(ii)4 marks· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 2Replace all the components in Figure 2 with NAND gates (Step 1) and minimise the number of gates to fit on a single quad-NAND chip (Step 2).
  83. 2(c)4 marks· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 2Draw a diagram of a bistable latch constructed from two NAND gates and, using the sequential truth table, explain how it operates as an electronic latch.
  84. Q251 mark · multiple choice· CAPE Physics Unit 2 · 2008 (T&T) · Paper 1Which symbol below represents an X-NOR logic gate?
  85. Q261 mark · multiple choice· CAPE Physics Unit 2 · 2008 (T&T) · Paper 1Item 26 refers to the following diagram. Which is the correct truth table for the circuit above?
  86. Q271 mark · multiple choice· CAPE Physics Unit 2 · 2008 (T&T) · Paper 1If the inputs to P and Q are both held at logic 1 then the states of R, S and T are
  87. Q281 mark · multiple choice· CAPE Physics Unit 2 · 2008 (T&T) · Paper 1The symbol for the logic gate which has the equivalent action to this complete circuit is
  88. Q291 mark · multiple choice· CAPE Physics Unit 2 · 2008 (T&T) · Paper 1If wires are connected as shown which indicators will be on?
  89. Q301 mark · multiple choice· CAPE Physics Unit 2 · 2008 (T&T) · Paper 1With inputs I_1 and I_2 and output Q, the whole circuit could be replaced by
  90. 5(a)(i)2 marks· CAPE Physics Unit 2 · 2008 (T&T) · Paper 2Draw the truth tables for a NOR gate and a NAND gate.
  91. 5(a)(ii)3 marks· CAPE Physics Unit 2 · 2008 (T&T) · Paper 2Draw a circuit diagram to show how a NAND gate may be constructed from a number of NOR gates.
  92. 5(a)(iii)3 marks· CAPE Physics Unit 2 · 2008 (T&T) · Paper 2Redesign the circuit shown in Figure 9 so that it may be constructed using ONLY NOR gates. Reduce the circuit to the MINIMUM chip count.
  93. 5(b)(i)1 mark· CAPE Physics Unit 2 · 2008 (T&T) · Paper 2Add the binary numbers 1011 and 101.
  94. 5(b)(ii)2 marks· CAPE Physics Unit 2 · 2008 (T&T) · Paper 2Discuss the difference between a half-adder and a full-adder in digital electronics.
  95. 5(b)(iii)4 marks· CAPE Physics Unit 2 · 2008 (T&T) · Paper 2Draw a diagram to show how a full adder is constructed from half-adders and give an example to explain its operation.
  96. Q271 mark · multiple choice· CAPE Physics Unit 2 · 2009 · Paper 1Two four-bit binary numbers are fed into the inputs, X and Y, on an AND gate. The numbers are represented by the pulse trains in the V-t diagrams shown below. Which ONE of the following pulse trains represents the…
  97. Q281 mark · multiple choice· CAPE Physics Unit 2 · 2009 · Paper 1Item 28 refers to the following diagram which shows a quad-NAND circuit board connected to a 6\text{ V} supply. It has an indicator diode connected to each output. The diodes are ON if the output is a logic 1. If…
  98. Q291 mark · multiple choice· CAPE Physics Unit 2 · 2009 · Paper 1Item 29 refers to the following diagram which shows a combination of logic gates. What single logic gate could replace this circuit?
  99. Q301 mark · multiple choice· CAPE Physics Unit 2 · 2009 · Paper 1Which is the correct circuit for a half-adder?
  100. 2(a)(i)1 mark· CAPE Physics Unit 2 · 2009 · Paper 2Complete the truth table to show the action of a NOR gate.
  101. 2(a)(ii)1 mark· CAPE Physics Unit 2 · 2009 · Paper 2Draw a diagram showing how a NOR gate can be connected to function as a NOT gate.
  102. 2(a)(iii)4 marks· CAPE Physics Unit 2 · 2009 · Paper 2Add connecting wires to the provided diagram of four NOR gates (Figure 2) to show how they can be connected together to form a NAND gate.
  103. 2(b)(i)1 mark· CAPE Physics Unit 2 · 2009 · Paper 2State the logic state of B when switch S2 is closed.
  104. 2(b)(ii)5 marks· CAPE Physics Unit 2 · 2009 · Paper 2Complete the truth table in Figure 4 for the logic circuit.
  105. 2(b)(iii)1 mark· CAPE Physics Unit 2 · 2009 · Paper 2State which logic combination of S1 and S2 will cause the lamp to be ON.
  106. 2(b)(iv)2 marks· CAPE Physics Unit 2 · 2009 · Paper 2Draw a logic circuit showing how NAND gates exclusively can be used to perform the identical function of the circuit in Figure 3.
  107. Q261 mark · multiple choice· CAPE Physics Unit 2 · 2010 · Paper 1If the wires are connected as shown which indicators will be on?
  108. Q281 mark · multiple choice· CAPE Physics Unit 2 · 2010 · Paper 1A full adder may be constructed from two half adders and a logic gate. The gate is
  109. Q291 mark · multiple choice· CAPE Physics Unit 2 · 2010 · Paper 1Two four-bit binary numbers are fed into the inputs X and Y of an OR gate. The numbers are represented by the pulse trains in the V-t diagrams below. Which of the following pulse trains represents the output pulse from…
  110. Q301 mark · multiple choice· CAPE Physics Unit 2 · 2010 · Paper 1Which of the following diagrams is the correctly labelled circuit for a half-adder?
  111. Q221 mark · multiple choice· CAPE Physics Unit 2 · 2011 · Paper 1The LED in the circuit above lights when
  112. Q261 mark · multiple choice· CAPE Physics Unit 2 · 2011 · Paper 1Which is the correct truth table for the circuit above?
  113. Q271 mark · multiple choice· CAPE Physics Unit 2 · 2011 · Paper 1If the inputs to P and Q are both held at logic 1, then the states of R, S and T are
  114. Q281 mark · multiple choice· CAPE Physics Unit 2 · 2011 · Paper 1The symbol for the logic gate which has the equivalent action to this complete circuit is
  115. Q291 mark · multiple choice· CAPE Physics Unit 2 · 2011 · Paper 1Two four-bit binary numbers are fed into the inputs X and Y of an OR gate. The numbers are represented by the pulse trains in the V-t diagrams below. Which of the following pulse trains represents the output pulse from…
  116. Q301 mark · multiple choice· CAPE Physics Unit 2 · 2011 · Paper 1Which of the following diagrams is the correct circuit for a half adder?
  117. 2(a)(i)1 mark· CAPE Physics Unit 2 · 2011 · Paper 2What does the term 'bistable' mean when used in reference to an electronic circuit?
  118. 2(a)(ii)5 marks· CAPE Physics Unit 2 · 2011 · Paper 2On Figure 2 (a), draw connecting wires to show the construction of an S-R flip-flop with inputs I_1 and I_2 and outputs Q and Q_bar. Complete the sequential truth table and describe how this circuit acts as an…
  119. 2(b)4 marks· CAPE Physics Unit 2 · 2011 · Paper 2Draw the truth table for the circuit using input waveforms A and B and resulting output waveform D shown in Figure 2 (b), and hence state the equivalent logic gate.
  120. 2(c)(i)1 mark· CAPE Physics Unit 2 · 2011 · Paper 2What is the frequency of the XOR output?
  121. 2(c)(ii)1 mark· CAPE Physics Unit 2 · 2011 · Paper 2If the same frequency is input but the other input to the XOR is tied to 5 V, what is the frequency of the output?
  122. 2(c)(iii)3 marks· CAPE Physics Unit 2 · 2011 · Paper 2The same square wave is applied to one input of logic gate P while the other input is grounded. The output waveform is a flat line at 0 V. State the name of logic gate P and use a truth table to explain your answer.
  123. Q271 mark · multiple choice· CAPE Physics Unit 2 · 2012 · Paper 1Which of the following shows the correct NOR gate equivalent of the given logic gate?
  124. Q281 mark · multiple choice· CAPE Physics Unit 2 · 2012 · Paper 1If wires are connected as shown, which indicators will be on?
  125. Q291 mark · multiple choice· CAPE Physics Unit 2 · 2012 · Paper 1With inputs I_1 and I_2 and output Q, the whole circuit could be replaced by
  126. Q301 mark · multiple choice· CAPE Physics Unit 2 · 2012 · Paper 1Two four-bit binary numbers are fed into the inputs X and Y of an OR gate. The numbers are represented by the pulse trains in the V-t diagrams below. Which of the following pulse trains represents the output pulse from…
  127. 5(b)(i)3 marks· CAPE Physics Unit 2 · 2012 · Paper 2Copy and complete the truth table (Table 3) for the digital circuit shown in Figure 8.
  128. 5(b)(ii)c)1 mark· CAPE Physics Unit 2 · 2012 · Paper 2Deduce the environmental conditions required for the LED to be conducting.
  129. Q241 mark · multiple choice· CAPE Physics Unit 2 · 2013 · Paper 1If the wires are connected as shown, which indicators will be on?
  130. Q251 mark · multiple choice· CAPE Physics Unit 2 · 2013 · Paper 1The circuit represents
  131. Q261 mark · multiple choice· CAPE Physics Unit 2 · 2013 · Paper 1Which is the correct truth table for the circuit above?
  132. Q291 mark · multiple choice· CAPE Physics Unit 2 · 2013 · Paper 1Two four-bit binary numbers are fed in series into the inputs, X and Y, on an AND gate. The numbers are represented by the pulse trains in the V-t diagrams shown below. Which of the following pulse trains represents…
  133. Q301 mark · multiple choice· CAPE Physics Unit 2 · 2013 · Paper 1Which of the following diagrams is the correct circuit for a half-adder?
  134. 5(a)3 marks· CAPE Physics Unit 2 · 2013 · Paper 2Use logic Y to represent the output of this system and draw up the truth table for the operation of the headlight automatic switching circuit. Write the logic equation represented by this truth table.
  135. 5(c)(i)3 marks· CAPE Physics Unit 2 · 2013 · Paper 2Replace the circuit in the dashed box, P, with one consisting of NAND gates only.
  136. 5(c)(ii)2 marks· CAPE Physics Unit 2 · 2013 · Paper 2The 7400 chip has 4 NAND gates. How many 7400 chips are required for the NAND-equivalent circuit drawn in Part c (i)?
  137. Q291 mark · multiple choice· CAPE Physics Unit 2 · 2014 · Paper 1Which of the following circuits shows the correct NOR gate equivalent of the given logic gate?
  138. Q301 mark · multiple choice· CAPE Physics Unit 2 · 2014 · Paper 1Which of the following circuits is correct for a half-adder?
  139. 5(a)4 marks· CAPE Physics Unit 2 · 2014 · Paper 2Draw truth tables and the circuit symbols for the 2-input NAND gate and the XNOR gate.
  140. 5(b)(i)2 marks· CAPE Physics Unit 2 · 2014 · Paper 2Draw the NOR equivalent of the AND gate.
  141. 5(b)(ii)1 mark· CAPE Physics Unit 2 · 2014 · Paper 2Draw the NOR equivalent of the OR gate.
  142. 5(b)(iii)1 mark· CAPE Physics Unit 2 · 2014 · Paper 2Draw the NOR equivalent of the NAND gate.
  143. 5(c)(i)3 marks· CAPE Physics Unit 2 · 2014 · Paper 2Show, by using a truth table, that the circuit in Figure 3 produces the Exclusive NOR operation.
  144. 5(c)(ii)4 marks· CAPE Physics Unit 2 · 2014 · Paper 2Hence, develop a circuit using NOR gates only which will provide Exclusive NOR operation.
  145. Q281 mark · multiple choice· CAPE Physics Unit 2 · 2015 · Paper 1Which single gate is the same as this network?
  146. Q291 mark · multiple choice· CAPE Physics Unit 2 · 2015 · Paper 1For the inputs shown in the circuit, the outputs are
  147. Q301 mark · multiple choice· CAPE Physics Unit 2 · 2015 · Paper 1Which of the following diagrams is the correct circuit for a half adder?
  148. 5(a)2 marks· CAPE Physics Unit 2 · 2015 · Paper 2Draw the truth table for a 2-input NAND gate.
  149. 5(b)4 marks· CAPE Physics Unit 2 · 2015 · Paper 2Complete Table 5 for the circuit shown in Figure 8 and hence show that this circuit is equivalent to a NAND gate.
  150. 5(c)4 marks· CAPE Physics Unit 2 · 2015 · Paper 2Draw the NAND gate version of an S-R flip-flop taking care to label all inputs and outputs.
  151. 5(d)5 marks· CAPE Physics Unit 2 · 2015 · Paper 2The signals S and R shown in Figure 9 are simultaneously applied to the corresponding inputs of an S-R flip-flop. Determine and draw on Figure 9, the Q-output (indicates that the flip-flop is set) of the flip-flop for…
  152. Q271 mark · multiple choice· CAPE Physics Unit 2 · 2016 · Paper 1The single gate this network represents is
  153. Q281 mark · multiple choice· CAPE Physics Unit 2 · 2016 · Paper 1The electrical circuit can be regarded as a logic gate. Which type of logic gate is represented? (Consider A and B as inputs and Q as the output.)
  154. Q301 mark · multiple choice· CAPE Physics Unit 2 · 2016 · Paper 1Which of the following pulse trains represents the output pulse from the OR gate?
  155. Q271 mark · multiple choice· CAPE Physics Unit 2 · 2017 · Paper 1Which of the following diagrams shows the correct circuit for a half adder?
  156. Q281 mark · multiple choice· CAPE Physics Unit 2 · 2017 · Paper 1Item 28 refers to the following diagram which shows a combination of NOR gates. [Network of four 2-input NOR gates with inputs A and B and a single output] Which single gate is the same as this network?
  157. Q291 mark · multiple choice· CAPE Physics Unit 2 · 2017 · Paper 1Items 29-30 refer to the following diagram. [Logic circuit diagram with inputs P and Q to a NOR gate producing R, an AND gate producing S, and R and S fed into a NOR gate producing T] If the inputs to P and Q are both…
  158. Q261 mark · multiple choice· CAPE Physics Unit 2 · 2018 · Paper 1For the inputs shown in the circuit, the outputs are
  159. Q271 mark · multiple choice· CAPE Physics Unit 2 · 2018 · Paper 1The single gate this network represents is
  160. Q281 mark · multiple choice· CAPE Physics Unit 2 · 2018 · Paper 1The electrical circuit can be regarded as a logic gate. Which type of logic gate is represented? (Consider A and B as inputs and Q as the output.)
  161. Q301 mark · multiple choice· CAPE Physics Unit 2 · 2018 · Paper 1Two four-bit binary numbers are fed in series into the inputs, A and B, of an OR gate. The numbers are represented by the pulse trains in the following V\text{-}t diagrams. Which of the following pulse trains…
  162. Q281 mark · multiple choice· CAPE Physics Unit 2 · 2019 · Paper 1Item 28 refers to the following diagram which shows a combination of NOR gates. Which single gate is the same as this network?
  163. Q291 mark · multiple choice· CAPE Physics Unit 2 · 2019 · Paper 1Items 29–30 refer to the following diagram. If the inputs to P and Q are both held at logic 1, then the states of R, S and T are
  164. 2(a)(i)3 marks· Physics · Unit 2 Q2 2(a)(i)Draw the symbol and the truth table for the two-input NAND logic gate.
  165. 2(a)(ii)3 marks· Physics · Unit 2 Q2 2(a)(ii)Draw the symbol and the truth table for the two-input OR logic gate.
  166. 2(a)(iii)4 marks· Physics · Unit 2 Q2 2(a)(iii)Draw the symbol and the truth table for the two-input EXNOR logic gate.
  167. 2(b)8 marks· Physics · Unit 2 Q2 2(b)Complete Table 1 by deducing the corresponding values of C', D, E and F.
  168. 2(c)5 marks· Physics · Unit 2 Q2 2(c)Use your truth table in (b) to determine and sketch the resulting output waveform on the grid provided in Figure 3. On your sketch, include the binary equivalent of the output waveform.
  169. 2(d)7 marks· Physics · Unit 2 Q2 2(d)Draw a circuit containing NAND gates only equivalent to that shown in Figure 2.

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