Daily Practice - GCSE Computer Science
Systems, data representation, networks, algorithms and programming.
3rd September 2023
- 1Boolean Logic
A logic circuit has inputs C and D. C feeds into a NOT gate; the output of the NOT gate and D feed into an OR gate, giving output Y. Write the Boolean expression for Y and state its value when C = 1 and D = 0.
- 2Data Representation: Number Systems
Convert the denary number 5 to a 4-bit binary number.
- 3Data Representation: Images, Sound and Compression
State one example of a file format that commonly uses lossy compression.
- 4Programming 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'.
- 5SQL 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.
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