2025 A Level Computer Science H446/01 Computer systems (Verified Question Paper With Mark Scheme Combined June 2025)

A Level Computer Science H446/01 Computer systems Time allowed: 2 hours 30 minutes (Verified Question Paper With Mark Scheme Combined June 2025) INSTRUCTIONS •Use black ink. You can use an HB pencil, but only for graphs and diagrams. •Write your answer to each question in the space provided. If you need extra space use the lined pages at the end of this booklet. The question numbers must be clearly shown. •Answer all the questions. INFORMATION •The total mark for this paper is 140. •The marks for each question are shown in brackets [ ]. •Quality of extended response will be assessed in questions marked with an asterisk (*). •This document has 32 pages. ADVICE •Read each question carefully before you start your answer. © OCR 2025 [601/4911/5] DC (PQ/CB) 340531/5 OCR is an exempt Charity Turn over BLANK PAGE DO NOT WRITE ON THIS PAGE 1 Charlie is about to study a computer games design course at university. He needs to purchase a computer to allow him to design and edit the graphics in his games, including video files. (a)Charlie’s computer contains a data bus, an address bus and a control bus. State the purpose of each of these three buses. Data bus ........................................................................................................................................... .......................................................................................................................................................... Address bus ..................................................................................................................................... .......................................................................................................................................................... Control bus ....................................................................................................................................... .......................................................................................................................................................... [3] (b)Charlie will need to use input and output devices when designing and editing his computer games. (i)State one input device and one output device that Charlie could use and give an example use of each. Input device Device name .................................................................................................................................... .......................................................................................................................................................... Example use .................................................................................................................................... .......................................................................................................................................................... Output device Device name ..................................................................................................................................... .......................................................................................................................................................... Example use ..................................................................................................................................... .......................................................................................................................................................... [4] (ii)Charlie will need to store a large collection of files containing high definition images and high definition videos that he will use during his course. State a type of secondary storage device that Charlie could use and give a reason why. Type of storage ................................................................................................................................. .......................................................................................................................................................... Reason.............................................................................................................................................. .......................................................................................................................................................... [2] (c)In addition to the Central Processing Unit (CPU), Charlie will purchase a Graphical Processing Unit (GPU) that will be used to process and display the graphics in his games. (i)Tick () one box on each row to indicate if each statement is referring to a CPU or a GPU.