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App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 666 · 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.🔘 Our rule: buttons are at least 48 px tall. The Back button is 32 px tall. How many px taller must it be?
  2. 2.🔘 Our rule: buttons are at least 48 px tall. The Next button is 28 px tall. How many px taller must it be?
  3. 3.🔘 Is this good or poor button design: grey text on grey? (a) good design (b) poor design
  4. 4.Which colour pair is hard to read? (a) white on dark green (b) black on yellow (c) white on black (d) dark blue on black
  5. 5.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 64 px tall
    Help button: 32 px tall
    Start button: 64 px tall
    Send button: 52 px tall     (a) Send (b) Help (c) Start (d) Save
  6. 6.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 48 px tall
    Send button: 36 px tall
    Save button: 56 px tall     (a) Done (b) Send (c) Save
  7. 7.🔘 Is this good or poor button design: space between buttons? (a) poor design (b) good design
  8. 8.True or false: strong colour contrast is poor button design. (a) False (b) True
  9. 9.🔘 Is this good or poor button design: a big, easy tap area? (a) poor design (b) good design
  10. 10.🌗 Is black on yellow easy or hard to read on a button? (a) hard to read (b) easy to read
  11. 11.🌗 Is white on dark green easy or hard to read on a button? (a) hard to read (b) easy to read
  12. 12.🌗 Is black on pale grey easy or hard to read on a button? (a) hard to read (b) easy to read
  13. 13.True or false: a big, easy tap area is poor button design. (a) False (b) True
  14. 14.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 64 px tall
    Back button: 52 px tall
    Next button: 36 px tall
  15. 15.🔘 Our rule: buttons are at least 48 px tall. The Start button is 32 px tall. How many px taller must it be?
  16. 16.True or false: a clear word like Save is poor button design. (a) True (b) False
  17. 17.🔘 Our rule: buttons are at least 48 px tall. The Next button is 44 px tall. How many px taller must it be?
  18. 18.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 40 px tall
    Done button: 72 px tall
    Next button: 68 px tall     (a) Next (b) Done (c) Cancel
  19. 19.Which colour pair is easy to read? (a) dark blue on black (b) yellow on white (c) white on dark green (d) light grey on white
  20. 20.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 48 px tall
    Cancel button: 56 px tall
    Next button: 52 px tall
  21. 21.🔘 Is this good or poor button design: buttons almost touching? (a) good design (b) poor design
  22. 22.🔘 Is this good or poor button design: a clear word like Save? (a) poor design (b) good design
  23. 23.True or false: a tiny 20 px button is poor button design. (a) False (b) True
  24. 24.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 60 px tall
    Back button: 36 px tall
    Send button: 48 px tall
    Start button: 48 px tall     (a) Cancel (b) Back (c) Start (d) Send
  25. 25.Which colour pair is hard to read? (a) light grey on white (b) black on pale grey (c) white on dark green (d) dark blue on white
  26. 26.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Send button: 48 px tall
    Next button: 40 px tall
    Cancel button: 44 px tall
  27. 27.True or false: grey text on grey is poor button design. (a) False (b) True
  28. 28.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 72 px tall
    Start button: 60 px tall
    Done button: 28 px tall     (a) Start (b) Back (c) Done
  29. 29.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 32 px tall
    Back button: 32 px tall
    Help button: 56 px tall
    Send button: 60 px tall
  30. 30.Which colour pair is easy to read? (a) light grey on white (b) white on black (c) pale pink on white (d) red on green
  31. 31.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 32 px tall. How many px taller must it be?
  32. 32.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 48 px tall
    Save button: 48 px tall
    Cancel button: 40 px tall     (a) Back (b) Save (c) Cancel
  33. 33.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 32 px tall
    Done button: 36 px tall
    Start button: 36 px tall
  34. 34.🔘 Is this good or poor button design: strong colour contrast? (a) good design (b) poor design
  35. 35.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 48 px tall
    Back button: 64 px tall
    Help button: 32 px tall     (a) Help (b) Start (c) Back
  36. 36.Which colour pair is easy to read? (a) yellow on white (b) dark blue on black (c) light grey on white (d) black on pale grey
  37. 37.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 52 px tall
    Send button: 68 px tall
    Save button: 40 px tall
    Done button: 48 px tall     (a) Cancel (b) Send (c) Done (d) Save
  38. 38.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 40 px tall
    Cancel button: 32 px tall
    Back button: 52 px tall
    Send button: 36 px tall
  39. 39.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 52 px tall
    Send button: 32 px tall
    Save button: 52 px tall
  40. 40.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 60 px tall
    Done button: 40 px tall
    Save button: 40 px tall

Answer key

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

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