O-LevelComputer ScienceData Representation2210/11 · May/June 2025 · Q14 Marks

The size of a file can be measured using different data storage units.

(a)Tick (✔) one box to show the smallest data storage unit. A byte B gibibyte (GiB) C kibibyte (KiB) D nibble[1]
(b)State how many tebibytes (TiB) are equal to 2 pebibytes (PiB).[1]
(c)(i)The size of a file needs to be reduced. Give the name of the process that is used to reduce the size of a file.[1]
(c)(ii)One reason the size of a file may need reducing is so that it has a shorter transmission time. Give one other reason why the size of a file may need reducing.[1]

Mark scheme

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

[1] D
[1] 2048
[1] (Data) Compression
[1] Any one from: • Less bandwidth required to transmit the file • Less storage space needed to store the file • To meet email file size limit • To use less data allowance

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Topic: Data Representation, O-Level Computer Science (syllabus 2210). Structured question, 4 marks.
Source: O-Level Computer Science, May/June 2025 Paper 1 Variant 1, question 1.

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