Unit 3: Data

• What is Binary?


  Binary is a base-2 Numeral system using only two digits: 0 and 1
• What are the two states of Binary?

  0(Off) and 1(On)
• If you have 4 bits how many Binary combinations can you have?

  16 (2^4)
• What is Denary?


  Denary is Reffered to as a base 10 numeral system
• What is Hexadecimal?

  Hexadecimal is a base- 16 number system meaning that the place value increses by the powers of 16
• What is ASCII?


  The American Standard Code for Information Interchange is a character encoding standard for electronic communication
• What is a Pixel?

  A pixel is the smallest single point of colour in a graphic image
• What is a Nibble?

  A Nibble is half a byte (or 4 bits)
• Which one is more accurate the Decimal Prefix or the Binary Prefix?

  The Binary Prefix is more Accurate.
• What is Compression?

  Compression is changing the format of a data file so that the size of the file is smalled/reduced
• What is Bandwidth?

  The maximum amount of data that can be transmitted over a network in a given amount of time.
• What is Losless Compression?

  Lossless Compression is compressing a file in such a way that it can be decompressed without any loss of data
• What is Lossy Compression?

  Lossy Compression is where some of the data is removed; the original file cannot be restored when the lossy file is decompressed
• What is Run Length Encoding?

  Run-Length Encoding (RLE) is used to reduce the size of a repeating string of items.