Oxford Cambridge and RSA - Monday 16 May 2022 Afternoon GCSE (9–1) Computer Science - J277/01 Computer Systems

Sep 5, 2026

GCSE (9–1) Computer Science paper J277/01, Computer Systems, from OCR for the Oxford Cambridge and RSA exam board. The document includes exam administration details, writing and response instructions, marking information, and advice for tackling questions within a 1 hour 30 minutes timeframe. Questions cover binary and hexadecimal conversions, representation limits of bits, binary shifting, and identification of CPU components and registers. A LAN scenario assesses network performance factors, followed by terminology-based completion of the website access process.

LanguageEnglish

CategoryExam

FormatPDF

Pages16

Reading Time40 min

AccessFree to download

Instructions

Advice

Question 1 - Computers represent data in binary form

File sizes and binary equivalence

Conversions: denary, hexadecimal, binary

Representation and binary shift

Question 2 - CPU components and registers

Question 3 - LAN performance and website access

Oxford Cambridge and RSA Monday 16 May 2022 – Afternoon GCSE (9–1) Computer Science J277/01 Computer Systems Time allowed: 1 hour 30 minutes | Please write clearly in black ink. Do not write in the barcodes. | | | | | --- | --- | --- | --- | | Centre number | | Candidate number | | | First name(s)
Last name | | | | 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 80. • 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 16 pages. ADVICE • Read each question carefully before you start your answer. © OCR 2022 [601/8355/X] DC (ST) 319927/2 R OCR is an exempt Charity Turn over PMT PMT 2 Answer all the questions. 1 Computers represent data in binary form. (a) Tick (3) one box in each row to identify the binary unit equivalent of each of the given file sizes. | File size | 2 megabytes | 2 petabytes | 2 kilobytes | 2 bytes | 2 gigabytes | | --- | --- | --- | --- | --- | --- | | 2000 bytes | | | | | | | 2000 terabytes | | | | | | | 16 bits | | | | | | | 4 nibbles | | | | | | [4] (b) Convert the denary number 221 into 8 bit binary. Show your working. ................................................................................................................................................... ................................................................................................................................................... .............................................................................................................................................. [2] (c) Convert the hexadecimal number 2F into denary. Show your working. ................................................................................................................................................... .............................................................................................................................................. [2] (d) Convert the binary number 10110000 into hexadecimal. .............................................................................................................................................. [ 1] (e) Identify how many unique values can be represented by 4 bits............................................................................................................................................... [ 1] (f) Perform a binary shift of 3 places right on the binary number 10001110............................................................................................................................................... [ 1] PMT 3 2 Complete the table by writing the missing definition or name of each of the common CPU components and registers. | CPU component or register | Definition | | --- | --- | | | Stores the address of the next instruction to be fetched from memory. Increments during each fetch-execute cycle. | | CU (Control Unit) | | | | Stores the address of the data to be fetched from or the address where the data is to be stored. | | | Performs mathematical calculations and logical operations. | [4] © OCR 2022 Turn over PMT 4 3 A library has a LAN (Local Area Network) . (a) The LAN allows access by both wired and wireless devices. Users have reported that the network sometimes runs very slowly. (i) Explain why the number of devices using the network at the same time can affect the performance of the network. .............................................................................................................................. ............

FAQs

What is the total time allowed for this GCSE Computer Science paper?

The time allowed is 1 hour 30 minutes.

What topics are assessed in Question 1?

Question 1 assesses binary data representation, conversions between denary, binary and hexadecimal, plus tasks like unique values from bits and performing a right binary shift.

How does the paper test understanding of CPU components?

Question 2 requires completing definitions or names for common CPU components and registers, including roles such as fetching next instructions, storing addresses, and performing operations.

Sep 5, 2026

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