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App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 661 · 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 this good or poor button design: a clear word like Save? (a) good design (b) poor design
  2. 2.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 24 px tall. How many px taller must it be?
  3. 3.🌗 Is white on black easy or hard to read on a button? (a) hard to read (b) easy to read
  4. 4.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 36 px tall
    Send button: 64 px tall
    Help button: 68 px tall     (a) Help (b) Send (c) Cancel
  5. 5.Which colour pair is hard to read? (a) yellow on white (b) black on pale grey (c) black on yellow (d) white on dark green
  6. 6.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 36 px tall
    Help button: 52 px tall
    Start button: 52 px tall
    Back button: 48 px tall
  7. 7.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 24 px tall
    Next button: 68 px tall
    Done button: 64 px tall     (a) Next (b) Done (c) Start
  8. 8.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 24 px tall
    Back button: 72 px tall
    Help button: 48 px tall     (a) Help (b) Send (c) Back
  9. 9.🔘 Is this good or poor button design: buttons almost touching? (a) poor design (b) good design
  10. 10.True or false: a tiny 20 px button is poor button design. (a) True (b) False
  11. 11.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 40 px tall
    Cancel button: 48 px tall
    Send button: 52 px tall     (a) Cancel (b) Send (c) Help
  12. 12.Which colour pair is easy to read? (a) yellow on white (b) black on pale grey (c) red on green (d) dark blue on black
  13. 13.Which colour pair is hard to read? (a) white on dark green (b) dark blue on black (c) dark blue on white (d) black on yellow
  14. 14.True or false: a tiny 20 px button is good button design. (a) False (b) True
  15. 15.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 44 px tall
    Save button: 52 px tall
    Done button: 64 px tall
    Back button: 64 px tall     (a) Send (b) Back (c) Save (d) Done
  16. 16.Which colour pair is hard to read? (a) white on black (b) dark blue on white (c) white on dark green (d) light grey on white
  17. 17.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Send button: 64 px tall
    Back button: 56 px tall
    Start button: 32 px tall
    Save button: 64 px tall
  18. 18.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 48 px tall
    Back button: 72 px tall
    Send button: 32 px tall
    Cancel button: 48 px tall     (a) Send (b) Cancel (c) Back (d) Start
  19. 19.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 36 px tall
    Send button: 60 px tall
    Save button: 60 px tall
    Cancel button: 64 px tall     (a) Cancel (b) Save (c) Send (d) Next
  20. 20.🔘 Our rule: buttons are at least 48 px tall. The Send button is 20 px tall. How many px taller must it be?
  21. 21.Which colour pair is easy to read? (a) light grey on white (b) dark blue on black (c) red on green (d) white on black
  22. 22.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 36 px tall
    Save button: 64 px tall
    Cancel button: 52 px tall
  23. 23.🌗 Is dark blue on white easy or hard to read on a button? (a) hard to read (b) easy to read
  24. 24.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 68 px tall
    Help button: 52 px tall
    Cancel button: 24 px tall     (a) Help (b) Cancel (c) Next
  25. 25.🔘 Our rule: buttons are at least 48 px tall. The Start button is 20 px tall. How many px taller must it be?
  26. 26.True or false: space between buttons is good button design. (a) False (b) True
  27. 27.🔘 Is this good or poor button design: grey text on grey? (a) good design (b) poor design
  28. 28.🔘 Is this good or poor button design: a tiny 20 px button? (a) poor design (b) good design
  29. 29.Which colour pair is easy to read? (a) white on dark green (b) light grey on white (c) red on green (d) yellow on white
  30. 30.🌗 Is white on dark green 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. Which button is too small?
    Save button: 28 px tall
    Cancel button: 72 px tall
    Start button: 60 px tall
    Next button: 60 px tall     (a) Save (b) Start (c) Cancel (d) Next
  32. 32.Which colour pair is hard to read? (a) white on black (b) red on green (c) black on pale grey (d) black on yellow
  33. 33.🌗 Is black on yellow easy or hard to read on a button? (a) easy to read (b) hard to read
  34. 34.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 28 px tall
    Next button: 52 px tall
    Send button: 60 px tall     (a) Next (b) Send (c) Save
  35. 35.🔘 Our rule: buttons are at least 48 px tall. The Save button is 36 px tall. How many px taller must it be?
  36. 36.True or false: grey text on grey is good button design. (a) False (b) True
  37. 37.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 36 px tall. How many px taller must it be?
  38. 38.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 52 px tall
    Next button: 52 px tall
    Back button: 52 px tall
    Cancel button: 24 px tall     (a) Back (b) Start (c) Cancel (d) Next
  39. 39.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 52 px tall
    Send button: 72 px tall
    Cancel button: 44 px tall
    Start button: 48 px tall     (a) Send (b) Done (c) Cancel (d) Start
  40. 40.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 48 px tall
    Save button: 32 px tall
    Send button: 40 px tall
    Back button: 60 px tall

Answer key

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

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