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App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 288 · 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.Which colour pair is hard to read? (a) white on black (b) white on dark green (c) black on yellow (d) yellow on white
  2. 2.🔘 Our rule: buttons are at least 48 px tall. The Save button is 20 px tall. How many px taller must it be?
  3. 3.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 44 px tall
    Done button: 36 px tall
    Save button: 32 px tall
  4. 4.True or false: space between buttons is poor button design. (a) False (b) True
  5. 5.True or false: a big, easy tap area is poor button design. (a) True (b) False
  6. 6.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 48 px tall
    Send button: 60 px tall
    Done button: 40 px tall     (a) Cancel (b) Send (c) Done
  7. 7.🔘 Is this good or poor button design: a big, easy tap area? (a) poor design (b) good design
  8. 8.True or false: a clear word like Save is poor button design. (a) True (b) False
  9. 9.Which colour pair is hard to read? (a) red on green (b) black on yellow (c) white on dark green (d) dark blue on white
  10. 10.🔘 Our rule: buttons are at least 48 px tall. The Send button is 40 px tall. How many px taller must it be?
  11. 11.🔘 Our rule: buttons are at least 48 px tall. The Send button is 36 px tall. How many px taller must it be?
  12. 12.🔘 Is this good or poor button design: a clear word like Save? (a) poor design (b) good design
  13. 13.True or false: buttons almost touching is poor button design. (a) False (b) True
  14. 14.🔘 Is this good or poor button design: buttons almost touching? (a) good design (b) poor design
  15. 15.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 32 px tall
    Done button: 68 px tall
    Back button: 56 px tall
    Next button: 52 px tall     (a) Back (b) Next (c) Done (d) Start
  16. 16.Which colour pair is easy to read? (a) red on green (b) light grey on white (c) white on dark green (d) pale pink on white
  17. 17.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 68 px tall
    Cancel button: 48 px tall
    Next button: 32 px tall
    Back button: 56 px tall     (a) Back (b) Next (c) Cancel (d) Start
  18. 18.🔘 Our rule: buttons are at least 48 px tall. The Save button is 36 px tall. How many px taller must it be?
  19. 19.🔘 Is this good or poor button design: a tiny 20 px button? (a) good design (b) poor design
  20. 20.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 36 px tall
    Help button: 64 px tall
    Next button: 60 px tall     (a) Next (b) Cancel (c) Help
  21. 21.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 40 px tall
    Send button: 52 px tall
    Help button: 52 px tall
  22. 22.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 72 px tall
    Cancel button: 72 px tall
    Done button: 40 px tall     (a) Done (b) Cancel (c) Save
  23. 23.🔘 Our rule: buttons are at least 48 px tall. The Help button is 36 px tall. How many px taller must it be?
  24. 24.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 24 px tall
    Send button: 52 px tall
    Help button: 52 px tall
    Done button: 60 px tall     (a) Send (b) Help (c) Start (d) Done
  25. 25.Which colour pair is easy to read? (a) white on black (b) yellow on white (c) light grey on white (d) pale pink on white
  26. 26.🔘 Our rule: buttons are at least 48 px tall. The Done button is 44 px tall. How many px taller must it be?
  27. 27.🔘 Our rule: buttons are at least 48 px tall. The Next button is 24 px tall. How many px taller must it be?
  28. 28.True or false: a tiny 20 px button is poor button design. (a) True (b) False
  29. 29.🔘 Is this good or poor button design: icons with no meaning? (a) good design (b) poor design
  30. 30.Which colour pair is easy to read? (a) pale pink on white (b) red on green (c) black on yellow (d) yellow on white
  31. 31.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 32 px tall
    Back button: 32 px tall
    Send button: 32 px tall
  32. 32.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 64 px tall
    Save button: 40 px tall
    Start button: 40 px tall
    Send button: 56 px tall
  33. 33.🔘 Our rule: buttons are at least 48 px tall. The Start button is 36 px tall. How many px taller must it be?
  34. 34.Which colour pair is easy to read? (a) light grey on white (b) yellow on white (c) dark blue on white (d) red on green
  35. 35.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 56 px tall
    Done button: 44 px tall
    Next button: 32 px tall
  36. 36.🔘 Is this good or poor button design: grey text on grey? (a) poor design (b) good design
  37. 37.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 56 px tall
    Help button: 72 px tall
    Save button: 44 px tall     (a) Help (b) Save (c) Send
  38. 38.🌗 Is red on green easy or hard to read on a button? (a) easy to read (b) hard to read
  39. 39.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 72 px tall
    Next button: 44 px tall
    Cancel button: 60 px tall
    Save button: 68 px tall     (a) Next (b) Start (c) Save (d) Cancel
  40. 40.🔘 Our rule: buttons are at least 48 px tall. The Back button is 28 px tall. How many px taller must it be?

Answer key

  1. yellow on white
  2. 28
  3. 0
  4. False
  5. False
  6. Done
  7. good design
  8. False
  9. red on green
  10. 8
  11. 12
  12. good design
  13. True
  14. poor design
  15. Start
  16. white on dark green
  17. Next
  18. 12
  19. poor design
  20. Cancel
  21. 2
  22. Done
  23. 12
  24. Start
  25. white on black
  26. 4
  27. 24
  28. True
  29. poor design
  30. black on yellow
  31. 0
  32. 2
  33. 12
  34. dark blue on white
  35. 1
  36. poor design
  37. Save
  38. hard to read
  39. Next
  40. 20

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