App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 670 · 40 questions

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.

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

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