Daily Practice · GCSE Computer Science

Daily Practice - GCSE Computer Science

Systems, data representation, networks, algorithms and programming.

3rd April 2025

5 questions · GCSE · 123 questions in this band

1
Data Representation: Images, Sound and Compression
An uncompressed file is 6000 KB. After lossless compression it is 1500 KB. Calculate the compression ratio in the form n:1 (original size : compressed size).
2
Programming Practice: Writing and Refining Programs
State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
3
SQL and Data Handling
A table called books has fields bookId, title, authorId and copiesAvailable. Write an SQL statement that selects the title of every book with more than 2 copies available.
4
Trace Tables and Binary/Hex Conversions
Convert the hexadecimal number FF to an 8-bit binary number.
5
Systems Architecture
Which CPU register holds the address of the next instruction to be fetched?

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