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App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 477 · 40 questions
TalentJR

Developer's tip (Big and bold): Our rule: every button is at least 48 px tall. Missing px = 48 − height. Leave space between buttons; use clear words like Save or Send. Strong contrast (black on yellow, white on dark green) is easy to read; similar colours are hard.

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  1. 1.🌗 Is black on pale grey easy or hard to read on a button? (a) hard to read (b) easy to read
  2. 2.Which colour pair is easy to read? (a) light grey on white (b) dark blue on white (c) red on green (d) yellow on white
  3. 3.Which colour pair is easy to read? (a) pale pink on white (b) dark blue on black (c) red on green (d) black on yellow
  4. 4.True or false: grey text on grey is poor button design. (a) False (b) True
  5. 5.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 48 px tall
    Start button: 44 px tall
    Next button: 48 px tall
    Save button: 60 px tall     (a) Next (b) Save (c) Cancel (d) Start
  6. 6.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 60 px tall
    Help button: 32 px tall
    Send button: 52 px tall
  7. 7.🌗 Is red on green easy or hard to read on a button? (a) hard to read (b) easy to read
  8. 8.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Send button: 40 px tall
    Start button: 60 px tall
    Done button: 36 px tall
    Back button: 40 px tall
  9. 9.True or false: a big, easy tap area is good button design. (a) True (b) False
  10. 10.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 64 px tall
    Help button: 36 px tall
    Next button: 32 px tall
    Save button: 36 px tall
  11. 11.🔘 Our rule: buttons are at least 48 px tall. The Help button is 44 px tall. How many px taller must it be?
  12. 12.True or false: buttons almost touching is poor button design. (a) True (b) False
  13. 13.🌗 Is yellow on white easy or hard to read on a button? (a) easy to read (b) hard to read
  14. 14.🔘 Is this good or poor button design: a big, easy tap area? (a) poor design (b) good design
  15. 15.🌗 Is dark blue on white easy or hard to read on a button? (a) hard to read (b) easy to read
  16. 16.🔘 Our rule: buttons are at least 48 px tall. The Back button is 32 px tall. How many px taller must it be?
  17. 17.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 44 px tall
    Save button: 72 px tall
    Help button: 64 px tall     (a) Help (b) Cancel (c) Save
  18. 18.🌗 Is white on dark green easy or hard to read on a button? (a) hard to read (b) easy to read
  19. 19.True or false: a big, easy tap area is poor button design. (a) True (b) False
  20. 20.Which colour pair is hard to read? (a) white on black (b) black on yellow (c) red on green (d) black on pale grey
  21. 21.True or false: a clear word like Save is poor button design. (a) False (b) True
  22. 22.True or false: a clear word like Save is good button design. (a) False (b) True
  23. 23.🔘 Our rule: buttons are at least 48 px tall. The Send button is 40 px tall. How many px taller must it be?
  24. 24.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 36 px tall
    Next button: 56 px tall
    Start button: 44 px tall
  25. 25.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 36 px tall
    Cancel button: 48 px tall
    Save button: 52 px tall
    Start button: 56 px tall     (a) Start (b) Send (c) Cancel (d) Save
  26. 26.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 56 px tall
    Save button: 28 px tall
    Cancel button: 64 px tall     (a) Done (b) Cancel (c) Save
  27. 27.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Send button: 36 px tall
    Start button: 48 px tall
    Cancel button: 40 px tall
  28. 28.True or false: icons with no meaning is good button design. (a) False (b) True
  29. 29.Which colour pair is easy to read? (a) light grey on white (b) yellow on white (c) white on dark green (d) red on green
  30. 30.🌗 Is white on black easy or hard to read on a button? (a) hard to read (b) easy to read
  31. 31.🔘 Our rule: buttons are at least 48 px tall. The Help button is 20 px tall. How many px taller must it be?
  32. 32.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 52 px tall
    Back button: 44 px tall
    Help button: 32 px tall
    Send button: 56 px tall
  33. 33.🔘 Is this good or poor button design: a tiny 20 px button? (a) poor design (b) good design
  34. 34.🌗 Is dark blue on black easy or hard to read on a button? (a) hard to read (b) easy to read
  35. 35.🔘 Is this good or poor button design: icons with no meaning? (a) good design (b) poor design
  36. 36.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 48 px tall
    Save button: 48 px tall
    Start button: 36 px tall
  37. 37.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 56 px tall
    Done button: 68 px tall
    Help button: 64 px tall
    Start button: 44 px tall     (a) Start (b) Done (c) Send (d) Help
  38. 38.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 60 px tall
    Send button: 32 px tall
    Cancel button: 52 px tall     (a) Back (b) Cancel (c) Send
  39. 39.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 32 px tall
    Save button: 44 px tall
    Send button: 64 px tall
  40. 40.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 40 px tall
    Cancel button: 44 px tall
    Save button: 52 px tall
    Start button: 40 px tall

Answer key

  1. easy to read
  2. dark blue on white
  3. black on yellow
  4. True
  5. Start
  6. 2
  7. hard to read
  8. 1
  9. True
  10. 1
  11. 4
  12. True
  13. hard to read
  14. good design
  15. easy to read
  16. 16
  17. Cancel
  18. easy to read
  19. False
  20. red on green
  21. False
  22. True
  23. 8
  24. 1
  25. Send
  26. Save
  27. 1
  28. False
  29. white on dark green
  30. easy to read
  31. 28
  32. 2
  33. poor design
  34. hard to read
  35. poor design
  36. 2
  37. Start
  38. Send
  39. 1
  40. 1

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