GCSE Computer Science: Data Representation

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Across
  1. 2. Half a byte.
  2. 5. A number system consisting of 1s and 0s.
  3. 6. A form of compression where data is discarded in order to significantly reduce file size.
  4. 7. Another name for binary. (2 words)
  5. 10. Number system using 0-9 and A-F.
  6. 12. The amount of data each pixel uses to represent colour information. (3 words)
  7. 14. A form of compression where no data is discarded.
  8. 15. Standard way of representing text.
  9. 17. Operation used to multipy or divide a binary number by powers of 2. (2 words)
  10. 20. A method of representing binary negatives that has problems with minus 0. (3 words)
  11. 21. A technique where each letter in a string is shifted along the alphabet, to hide the meaning of the text. (2 words)
  12. 23. 8 bits.
  13. 24. Harddisk capacity is often measured in this unit.
  14. 25. Occurs when the result of a calculation is too large to fit in the available bits.
Down
  1. 1. 1024 bytes.
  2. 3. A technique to represent binary data in a shorter form, saving storage space.
  3. 4. The capacity of RAM is usually measured in this unit.
  4. 8. The smallest element of an image.
  5. 9. How often we take a measurement (e.g. of a sound). (2 words)
  6. 11. The number of dots that make up an image.
  7. 13. The preferred way to represent binary negatives. (2 words)
  8. 16. The smallest piece of data in a computer system.
  9. 18. Modern way of representing text, using 2 or more bytes.
  10. 19. Scrambling data to prevent it being understood by unauthorised users.
  11. 22. Another name for hexadecimal. (2 words)