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OCR GCSE 2022 COMPUTER SCIENCE J277 QUESTION PAPER 1
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OCR GCSE 2022 COMPUTER SCIENCE J277 QUESTION PAPER 1
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, Oxford Cambridge and RSA
Monday 16 May 2022 – Afternoon
GCSE (9–1) Computer Science
J277/01 Computer Systems
Time allowed: 1 hour 30 minutes
Do not use:
* 9 1 3 8 0 7 7 9 1 0 *
• a calculator
* J 2 7 7 0 1 *
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] OCR is an exempt Charity
DC (ST) 319927/2 R Turn over
, 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]
© OCR 2022
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