Download 2025 Pearson Edexcel Level 1/Level 2 GCSE (9–1) Computer Science PAPER 1: Principles of Co and more Exams Computer Science in PDF only on Docsity!
• Answer^ all^ questions.
• Try^ to^ answer^ every^ question.
• The^ marks^ for^ each^ question^ are^ shown^ in^ brackets
• Fill^ in^ the^ boxes^ at^ the^ top^ of^ this^ page^ with^ your^ name,
2025 Pearson Edexcel Level 1/Level 2 GCSE (9–1) Computer Science PAPER 1: Principles of Computer Science Combined Question Paper & Marking Scheme Please check the examination details below before entering your candidate information Candidate surname Other names Centre Number Candidate Number
Pearson Edexcel Level 1/Level 2 GCSE (9–1)
Monday 12 May 2025
Afternoon (Time: 1 hour 30 minutes)
Computer Science
Paper
reference 1CP2/
Total Marks
Instructions
• Use^ black^ ink^ or^ ball-point^ pen.
centre number and candidate number. Answer the questions in the spaces provided
- there may be more space than you need. You are not allowed to use a calculator.
Information
• The^ total^ mark^ for^ this^ paper^ is^ 75.
- use this as a guide as to how much time to spend on each question.
Advice
• Read^ each^ question carefully^ before^ you start^ to^ answer^ it.
• Check^ your^ answers^ if^ you^ have^ time^ at^ the^ end.
Turn over You do not need any other materials.
PAPER 1: Principles of Computer Science
P78198A ©2025 Pearson Education Ltd. Y:1/1/1/1/1/1/1/1/
3 Turn over Answer ALL questions. Write your answers in the spaces provided. Some questions must be answered with a cross in a box. If you change your mind about an answer, put a line through the box and then mark your new answer with a cross. 1 Data (a) Binary patterns consist of groups of bits. (i) Identify the largest unit of measurement. A Gibibyte B Kibibyte C Mebibyte D Nibble (ii) State the number of unique values that can be represented with 7 bits.
.................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (iii) The denary ASCII code for D is 68. Give the denary ASCII code for G. (1) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (b) Hexadecimal is used to represent memory addresses. (i) Give two characteristics of hexadecimal notation. (2) 1............................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... 2............................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... DO
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4 .................................. (ii) Explain one reason why programmers use hexadecimal to specify memory addresses. (2)
.................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (c) Audio and image files store data in binary. (i) Explain one reason why lossy compression is used to reduce the size of an audio file. (2) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (ii) An image is 315 pixels wide, 923 pixels high and has a colour depth of 7 bits. Complete the expression to show the minimum file size in bytes. You do not have to do the calculation. (3) × × .................................. ..................................
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6 2 Computers (a) A washing machine uses many different embedded systems to wash clothes. (Source © Pearson Asset Library) Give two functions embedded systems perform in a washing machine. (2) 1...............................................................................................................................................................................................................................................................................
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7 Turn over (b) Computers use different types of storage. (i) Non-volatile storage keeps its content when the power is turned off. Give one other reason why computers use non-volatile storage. (1)
.................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (ii) State the type of secondary storage media that stores data as a sequence of pits and lands. (1) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (c) Programmers write code. (i) Describe how an interpreter translates high-level code. (2) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (ii) Assembly language is a low-level programming language. Give two characteristics of assembly language. (2) 1............................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... 2............................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... ....................................................................................................................................................................................................................................................................................
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(f) Here is a diagram of a central processing unit. Registers 1011 1111 0011 0011 0111 1011 1100 0111 0111 1101 0000 0001
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Control bus Data bus B Complete the table with the name for the labelled components. (4) Label Component A B C D (Total for Question 2 = 17 marks) 9 Turn over
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10 3 Issues and impact (a) Information is protected legally in several ways. (i) Identify the law that is broken when a person gains unauthorised access to a computer system. A Computer misuse B Consent C Copyright D Intellectual property (ii) One principle of data protection legislation is that data must be processed lawfully, fairly and in a transparent manner. Give three other principles of data protection legislation.
.................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... 2............................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... 3............................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (b) Software licensed as open-source can be used free of charge. Give one other characteristic of open-source software licensing. (1) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... ....................................................................................................................................................................................................................................................................................
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13 Turn over 4 Networks (a) A business has one office in New York and one in London. State the type of network needed to connect the two offices. (1)
.................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (b) Network protocols govern how data is transmitted between devices. Complete the table with the network protocol for each description. (3) Description Network protocol Allows two computers to establish a connection across a network Allows connection to a network using radio waves Allows upload and download of files across a network (c) Describe the role of an ethical hacker in network security. (3) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... DO
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.................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (Total for Question 4 = 13 marks) DO
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18 (b) Here is an algorithm to process sales data. 1 # ––––––––––––––––––––––––––––––––––––––––––––––––– 2 # Global variables 3 # ––––––––––––––––––––––––––––––––––––––––––––––––– 4 5 salesData = [[9, 6, 32], 6 [2 0 , 12, 9], 7 [9, 8, 8], 8 [32, 24, 29], 9 [7, 20 , 12], 10 [6, 9, 6]] 11 total = 0 12 currMax = 0 13 14 # ––––––––––––––––––––––––––––––––––––––––––––––––– 15 # Main program 16 # ––––––––––––––––––––––––––––––––––––––––––––––––– 17 for sale in salesData: 18 total = 0 19 for item in sale: 20 total = total + item 21 if (item < currMax): 22 currMax = item 23 print (sale, total) 24 print (currMax) 25
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(i) The data structure salesData is shown as a table of records, with fields in each record. Complete the table with the line number for each traversal. Line number Traverses the records Traverses the fields (ii) There is a logic error in the code. Write the corrected line of code.
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