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Use pencil only for drawing.  \n• Answer all questions.  \n• You must answer the questions in the spaces provided.  \n• Do all rough work in this book. Cross through any work you do not want to be marked.  \n• You must not use a calculator.  \nInformation  \n• The total number of marks available for this paper is 80.  \nAdvice  \n| For Examiner’s Use |  |\n| --- | --- |\n| Pages | Mark |\n| 2–3 |  |\n| 4–5 |  |\n| 6–7 |  |\n| 8–9 |  |\n| 10–11 |  |\n| 12–13 |  |\n| 14–16 |  |\n| TOTAL |  |\n\n\n| For the multiple-choice questions, completely fill in the lozenge alongside the appropriate answer. |  |  |  |\n| --- | --- | --- | --- |\n| CORRECT METHOD | | WRONG METHODS | |\n| If you want to change your answer you must cross out your original answer as shown.\u003Cbr>If you wish to return to an answer previously crossed out, ring the answer you now wish to select as shown.\u003Cbr>\u003Cbr>|  |  |  |\n\n*jun198520201* IB/G/Jun19/E8 8520/2  \n\n| Answer all questions in the spaces provided. |\n| --- |\n|  0  1  .  1 Convert the decimal number 197 into binary.\u003Cbr>[ 1 mark]\u003Cbr> 0  1  .  2 Convert the hexadecimal number A4 into decimal.\u003Cbr>Show your working.\u003Cbr>[2 marks]\u003Cbr>\u003Cbr>Answer \u003Cbr> 0  2  .  1 What is the largest decimal number that can be represented using 5 bits?\u003Cbr>[ 1 mark]\u003Cbr> 0  2  .  2 How many bits are there in 3 MB?\u003Cbr>Show your working.\u003Cbr>[2 marks]\u003Cbr>\u003Cbr>Answer  |\n\noutside the box  \n\n|  |  |  | State one advantage of using Unicode instead of using ASCII.\u003Cbr>[ 1 mark] |  |  | outside the\u003Cbr>box |\n| --- | --- | --- | --- | --- | --- | --- |\n|  | 0 | 3 |  |  |  |  |\n|  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |\n|  |  |  | Which two of the following are components of a CPU? |  |  |  |\n|  | 0 | 4 |  |  |  |  |\n|  |  |  |  |  |  |  |\n|  |  |  | Shade two lozenges.\u003Cbr>A Arithmetic logic unit B Control unit C Fan\u003Cbr>D Hard disk drive\u003Cbr>E Keyboard\u003Cbr>F Power supply unit | | [2 marks] |  |\n|  | 0 | 5 | A computer game is one type of application software. State two other types of application software. You must not use brand names in your answer.\u003Cbr>[2 marks]\u003Cbr>1   2  \u003Cbr>Turn over for the next question |  |  |  |\n|  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |\n|  |  |  |  |  |  | 11 |\n\n0  6  Select the correct statement about secondary storage.  \nShade one lozenge.  \n[1 mark]  \nA Secondary storage is a type of ROM.   \nB Secondary storage is non-volatile.   \nC Secondary storage is temporary.   \nD Secondary storage loses its content when it is turned off.   \n0  7  Describe how an optical disk is read.  \n[4 marks]  \n|  |\n| --- |\n|  |\n|  |\n|  |\n|  |\n|  |\n|  |\n|  |\n|  |\n|  |\n|  |\n\noutside the box  \n\n| \u003Cbr> 0  8  The Huffman tree in Figure 1 was generated for the string ARE ALL STARS REAL\u003Cbr>Figure 1\u003Cbr> 0  8  .  1 Part of the string ARE ALL STARS REAL was incorrectly encoded as in Figure 2 below.\u003Cbr>Figure 2\u003Cbr>1111000010101011\u003Cbr>What string does this encoding represent?\u003Cbr>[ 1 mark]\u003Cbr> 0  8  .  2 What would be the correct binary encoding for the substring STAR?\u003Cbr>|  |\n| --- | --- |\n| Write the correct encoding below the letters in the table.\u003Cbr>S T A R | [2 marks] |\n\noutside the box  \n\n|  |\n| --- |\n| 8 |\n\n0  9  Explain two reasons why software companies usually do not make their source code  \npublicly available. Source code is the code they wrote to create the software.  \n[4 marks]  \n\n|  |\n| --- |\n|  |\n|  |\n|  |\n|  |\n|  |\n|  |\n|  |\n|  |\n|  |\n|  |\n\n1  0  Define the term embedded system.  \n[2 marks]  \n\n|  |\n| --- |\n|  |\n|  |\n\noutside the box  \n\n|  |  |  |  |  | Draw a simple diagram to show a star network topology containing four desktop comput","cbCaibg7j3NdFobG","https://ap.wps.com/l/cbCaibg7j3NdFobG","pdf",545635,16,"English","# Instructions\n## Materials and time\n# Marking and response rules\n# Questions\n## Number systems and encoding\n## CPU components and software types\n## Storage and embedded systems\n## Network topologies and protocols\n## Network security and user authentication","[{\"question\":\"What are the key rules for answering this paper?\",\"answer\":\"Use black ink or a black ball-point pen (pencil only for drawing). Answer all questions in the spaces provided, do rough work in the booklet, and cross out any work not meant to be marked. 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