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5 Written questions

5 Matching questions

  1. two's complement (8 bit)
  2. Unicode
  3. bit map disadvantage
  4. bit map advantage
  5. vector disadvantage
  1. a represents negative and positive numbers in the range -128 to +127
  2. b resolution dependant (zooming will show pixels), large file size for high resolution / high colour depth, limited editing - pixel operations only
  3. c photos, images that can't easily be represented as shapes
  4. d limited types of image possible, drawings only
  5. e 16 bit code to represent characters from all the world's alphabets and symbols

5 Multiple choice questions

  1. bitmap file size depends on the resolution and the bit depth for pixel colour; (length in pixels) x (breadth in pixels) x (bit depth)
  2. 4 bytes with binary place values 2^0 to 2^31, maximum value (2^32)-1
  3. graphic file size made smaller by using special algorithms to reduce amount of data needed for bitmap
  4. some resolution data is lost, image quality affected
  5. Digital color model that uses eight bits each for the three additive colors (red, green, blue.) It can reproduce 256 shades of each primary color. Total 16 million shades. True colour.

5 True/False questions

  1. ASCIIlimit for smallest value (near zero) and largest value on number line depends on number of bits for exponent (moves the point)


  2. bit depthnumber of bits used to code a colour, aka colour depth


  3. lossless compressionno resolution information is lost


  4. 8 bit color256 possible colours


  5. unicode disadvantageeach character needs more bits (twice)