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--- |\n| Centre number |  | Candidate number |  |\n| Surname  \u003Cbr>Forename(s)  \u003Cbr>Candidate signature   |  |  |  |\n\nGCSE  \nCOMPUTER SCIENCE  \nPaper 2- Computing concepts  \nSample assessment materials Time allowed: 1 hour 45 minutes  \nMaterials  \n• There are no additional materials required for this paper.  \n• You must not use a calculator.  \nInstructions  \n• Use black ink or black ball-point pen. 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.  \n• Cross through any work you do not want to be marked.  \nInformation  \n• The total number of marks available for this paper is 90.  \nAdvice  \n| For Examiner’s Use |  |\n| --- | --- |\n| Question | Mark |\n| 1 |  |\n| 2 |  |\n| 3–5 |  |\n| 6 |  |\n| 7 |  |\n| 8 |  |\n| 9–10 |  |\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. |  |  |  |  |\n| If you wish to return to an answer previously crossed out, ring the answer you now wish to select as shown.\u003Cbr>|  |  |  |  |\n\nAnswer all questions.  \n0  1  A bit pattern is shown in Figure 1.  \nFigure 1  \n01001110  \n0  1  .  1  Convert the bit pattern shown in Figure 1 into decimal.  \n[1 mark]  \n0  1  .  2  Convert the bit pattern shown in Figure 1 into hexadecimal.  \n[2 marks]  \n\n|  |\n| --- |\n|  |\n\nAnswer:   \noutside the box  \n 0  1  .  3 A student’s answer to the question “Why is hexadecimal often used instead of binary?” is shown in Figure 2.  \nFigure 2  \nBecause it uses fewer digits it will take up less space in a computer’s memory.  \nExplain why the student’s answer is incorrect.  \n[2 marks]  \n\n|  |\n| --- |\n|  |\n\n 0  1  .  4 Explain how a binary number can be multiplied by 8 by shifting bits.  \n[2 marks]  \n\n|  |\n| --- |\n|  |\n|  |\n\nASCII (American Standard Code for Information Interchange) is a coding system that can be used to represent characters. In ASCII the character A is represented by the numeric code 65.  \n0  1  .  5  Shade one lozenge to indicate which character is represented by the numeric code 70.  \n[1 mark]  \nA  \nB  \nE  \nF  \nC f     \nD 6   \nE e     \noutside the box  \n0  1  .  6  Unicode is an alternative to the ASCII coding system.  \nDescribe one advantage and one disadvantage of using Unicode to represent characters instead of using ASCII.  \n[2 marks]  \nWhen data is stored in a computer it is often compressed. One method that can be used to compress text data is Huffman coding. To produce a Huffman code each character in a piece of text is placed in a tree, with its position in the tree determined by how often the character was used in the piece of text.  \nA Huffman tree for the text ZOE SAW A ZEBRA AT THE ZOO is shown in Figure 3.  \nFigure 3  \nSPACE  \noutside the box  \n\n|  |  |  |  |  | Using this Huffman tree, the Huffman coding for the character E would be the bit pattern 110 because from the top of the tree E is to the right, then right again and then left.\u003Cbr>The character Z is represented by the bit pattern 010 because from the top of the tree Z is to the left, then right and then left.\u003Cbr>Using the Huffman code in Figure 3 , complete the table to show the Huffman coding for the characters O, SPACE and B. [3 marks]\u003Cbr>Character Huffman coding O SPACE B\u003Cbr>Using Huffman coding, the text ZOE SAW A ZEBRA AT THE ZOO can be stored in 83 bits.\u003Cbr>Calculate how many additional bits are needed to store the same piece of text using\u003Cbr>ASCII. Show your working. [3 marks]\u003Cbr> | outside the\u003Cbr>box |\n| --- | --- | --- | --- | --- | --- | --- |\n|  | 0 | 1 | . | 7 |  |  |\n|  |  |  |  |  |  |  |\n|  | 0 | 1 | . | 8 |  |  |\n|  |  |  |  |  |  |  |\n|  |  |  |  |  |  | 16 |\n|  |  |  |  |  |  |  |\n\n0  2 Bob purchases a 4GB SD ","cbCaildacpwSxL5E","https://ap.wps.com/l/cbCaildacpwSxL5E","pdf",466192,24,"English","# GCSE\n## Paper 2- Computing concepts\n## Instructions and advice\n## Questions 1.1–1.10\n## Questions 0.2.1–0.2.5\n## Questions 0.3.1–0.3.4","[{\"question\":\"What is the total time allowed for Paper 2: Computing concepts?\",\"answer\":\"The time allowed is 1 hour 45 minutes.\"},{\"question\":\"Are additional materials or a calculator allowed for this paper?\",\"answer\":\"There are no additional materials required, and you must not use a calculator.\"},{\"question\":\"What topics does the paper cover in computing concepts?\",\"answer\":\"It includes bit pattern conversions, ASCII/Unicode character representation, Huffman coding and storage-size calculations, solid-state versus magnetic storage, magnetic disk data access, cloud storage trade-offs, and computer network concepts such as PANs and LANs.\"}]","GCSE Computer Science - Paper 2: Computing concepts - Sample assessment materials | PDF",1792467205]