Daily Practice · GCSE Computer Science

Daily Practice - GCSE Computer Science

15th April 1997

5 questions · GCSE · 123 questions in this band

1
Producing Robust Programs
Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
2
Boolean Logic
Evaluate X = NOT A AND B when A = 0 and B = 1.
3
Data Representation: Number Systems
An 8-bit register stores the value 01100000 (denary 96). State the resulting 8-bit binary value after a left shift by 1 place, and state whether an overflow occurs.
4
Data Representation: Images, Sound and Compression
An uncompressed file is 6000 KB. After lossless compression it is 1500 KB. Calculate the compression ratio in the form n:1 (original size : compressed size).
5
Programming 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'.

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