O-LevelComputer ScienceData Representation2210/13 · Oct/Nov 2025 · Q57 Marks

Text, images and sound are represented as binary to be processed by a computer.

(a)Complete the table by writing the missing terms and descriptions about representing text, images and sound as binary. Term | Description ---------------|------------ character set | | This is the number of samples taken each second when recording sound. pixel | resolution | | This is the number of bits used to represent a colour in an image.[5]
(b)The size of an image file is 1000 bytes. Give the size of the image file in bits.[1]
(c)The size of a sound file is 4096 mebibytes (MiB). Give the size of the file in gibibytes (GiB). Working space[1]

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2025). The mark or mark type is shown in brackets.

[5] One mark for each correct term or description
[5] character set: This stores all the characters and their unique binary values
[5] sample rate: This is the number of samples taken each second when recording sound.
[5] pixel: This is the smallest unit/part of an image
[5] resolution: This is the number of pixels that appear in an image/displayed on a screen // The number of pixels high by the number of pixels wide // the bit rate and sample rate of sound
[5] colour depth // bit depth: This is the number of bits used to represent a colour in an image.
[1] 8000 (bits)
[1] 4 (GiB)

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