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Data representation stk-cH Test

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5 Written Questions

5 Matching Questions

  1. vector graphic
  2. 16 bit color
  3. lossless compression
  4. 32 bit integer
  5. Unicode
  1. a no resolution information is lost
  2. b 16 bit code to represent characters from all the world's alphabets and symbols
  3. c image stored as collection of shapes, each represented by set of numbers defining properties such as coordinates, line thickness, fill colour, layer level
  4. d 64 thousand colours
  5. e 4 bytes with binary place values 2^0 to 2^31, maximum value (2^32)-1

5 Multiple Choice Questions

  1. accuracy of a floating point value depends on number of bits for mantissa (significant digits)
  2. photos, images that can't easily be represented as shapes
  3. image can scale to any size without increasing file size, shapes are fully editable by amending numbers that represent attributes eg change layer
  4. 256 possible colours
  5. resolution dependant (zooming will show pixels), large file size for high resolution / high colour depth, limited editing - pixel operations only

5 True/False Questions

  1. 24 bit color256 possible colours


  2. range7 bit code representing (only) latin type alphabets and language symbols


  3. image file sizebitmap file size depends on the resolution and the bit depth for pixel colour; (length in pixels) x (breadth in pixels) x (bit depth)


  4. lossy compressionsome resolution data is lost, image quality affected


  5. data compressiongraphic file size made smaller by using special algorithms to reduce amount of data needed for bitmap


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