Daily Practice - GCSE Computer Science
Systems, data representation, networks, algorithms and programming.
26th June 2024
- 1Programming 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
- 2SQL 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;
- 3Trace Tables and Binary/Hex Conversions
Convert the hexadecimal number 3F to denary.
- 4Systems Architecture
A CPU has a clock speed of 4.0 GHz. Calculate how many clock cycles it completes in 2 seconds.
- 5Memory and Primary Storage
State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
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