Computer Science A-level Unit 1

1. A programming language that uses hexadecimal values. (8, 4)
4. The time taken for a specific block of data on a track to rotate around to the read-write head. (7)
5. They are high speed temporary storage locations on the processor. They help the processor do its job by storing the data the processor needs to process each instruction. Data is constantly moving in and out of the registers. (9)
8. The implementation of an entity in a relational database.The tables are given names that reflect the data to be held within them. (5)
9. The Arithmetic Logic Unit is responsible for the arithmetic and logic processing needed by a program. (3)

2. They allow the code to use operating system commands e.g. for reading a file. (6, 5)
3. A requirement for data to only be available to authorised users. (4, 7)
6. OS software that is used to bring the executable program into memory and starts execution. (6)
7. A sequence of instructions that is often used as a repeatable block of code. It can be called from within the code and the macro name is replaced with the code resulting in an increase in program size. (5)
10. Classless Inter-domain Routing is an addressing scheme that allows a more flexible allocation of IP addresses than the original system of IP address classes. It allows the split between the netID and the hostID to be varied to suit individual needs. (4)

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