Daily Practice · GCSE Computer Science

Daily Practice - GCSE Computer Science

Systems, data representation, networks, algorithms and programming.

26th April 2024

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
Give one specific way this code could be refined without changing what it does: a = 5, b = 3, c = a + b, PRINT c
3
SQL and Data Handling
A table called staff has fields staffId, name, department and salary, storing these records: staffId | name | department | salary, 1 | Ben | Sales | 24000, 2 | Chloe | IT | 31000, 3 | Dan | Sales | 27000. State which staffId(s) would be returned by: SELECT staffId FROM staff WHERE department = 'Sales' AND salary > 25000;
4
Trace Tables and Binary/Hex Conversions
Convert the hexadecimal number 3F to denary.
5
Systems Architecture
Which CPU register holds the address of the next instruction to be fetched?

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