← Buttons: size and contrast lesson New set →

App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 343 · 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.

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

Answer key

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

Free app development lessons, practice and worksheets at talentjr.in/app-development-for-students