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App Dev Worksheet: Button Size and Contrast

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

Answer key

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

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