Daily Practice - GCSE Computer Science
Systems, data representation, networks, algorithms and programming.
- 1Data Representation: Images, Sound and Compression
An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
- 2Programming Practice: Writing and Refining Programs
State the value returned by LENGTH(word) if word stores the string 'Computer'.
- 3SQL and Data Handling
A table called members has fields memberId, firstName, lastName and joinYear. Write an SQL statement that adds a new record with memberId 12, firstName 'Priya', lastName 'Shah' and joinYear 2026.
- 4Trace Tables and Binary/Hex Conversions
Convert the 8-bit binary number 01011010 to denary.
- 5Systems Architecture
Two CPUs are compared for a task optimised for multiple cores: CPU A has 2 cores at 4.2 GHz; CPU B has 6 cores at 3.0 GHz. Explain which CPU is likely to perform better for this task.
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