Daily Practice · GCSE Computer Science

Daily Practice - GCSE Computer Science

Systems, data representation, networks, algorithms and programming.

28th May 2023

5 questions · GCSE · 123 questions in this band

1
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;
2
Trace Tables and Binary/Hex Conversions
Convert the hexadecimal number 3F to denary.
3
Systems Architecture
Convert the denary number 156 to an 8 bit binary number.
4
Memory and Primary Storage
Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
5
Secondary Storage
Give one example of an optical secondary storage device.

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