App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 657 · 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.🌗 Is dark blue on white easy or hard to read on a button? (a) hard to read (b) easy to read
2. 2.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 20 px tall. How many px taller must it be?
3. 3.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Send button: 40 px tall
   Cancel button: 68 px tall
   Help button: 60 px tall
   Start button: 48 px tall (a) Help (b) Send (c) Cancel (d) Start
4. 4.True or false: buttons almost touching is good button design. (a) False (b) True
5. 5.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Send button: 36 px tall
   Next button: 36 px tall
   Start button: 56 px tall
6. 6.🔘 Our rule: buttons are at least 48 px tall. The Next button is 24 px tall. How many px taller must it be?
7. 7.Which colour pair is easy to read? (a) yellow on white (b) black on pale grey (c) pale pink on white (d) light grey on white
8. 8.🌗 Is dark blue on black easy or hard to read on a button? (a) easy to read (b) hard to read
9. 9.True or false: a tiny 20 px button is good button design. (a) False (b) True
10. 10.Which colour pair is easy to read? (a) red on green (b) dark blue on black (c) dark blue on white (d) pale pink on white
11. 11.🔘 Our rule: buttons are at least 48 px tall. The Back button is 44 px tall. How many px taller must it be?
12. 12.🔘 Is this good or poor button design: grey text on grey? (a) poor design (b) good design
13. 13.🌗 Is white on dark green easy or hard to read on a button? (a) hard to read (b) easy to read
14. 14.True or false: buttons almost touching is poor button design. (a) True (b) False
15. 15.True or false: space between buttons is good button design. (a) False (b) True
16. 16.🔘 Our rule: buttons are at least 48 px tall. The Back button is 28 px tall. How many px taller must it be?
17. 17.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 56 px tall
    Send button: 52 px tall
    Cancel button: 40 px tall (a) Send (b) Help (c) Cancel
18. 18.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 40 px tall
    Help button: 36 px tall
    Save button: 52 px tall
19. 19.🔘 Is this good or poor button design: buttons almost touching? (a) poor design (b) good design
20. 20.True or false: a big, easy tap area is good button design. (a) False (b) True
21. 21.Which colour pair is hard to read? (a) dark blue on white (b) white on black (c) red on green (d) black on yellow
22. 22.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 52 px tall
    Next button: 72 px tall
    Back button: 44 px tall (a) Next (b) Done (c) Back
23. 23.True or false: a clear word like Save is poor button design. (a) True (b) False
24. 24.🔘 Our rule: buttons are at least 48 px tall. The Next button is 40 px tall. How many px taller must it be?
25. 25.🌗 Is red on green 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?
    Next button: 32 px tall
    Cancel button: 40 px tall
    Help button: 32 px tall
27. 27.True or false: icons with no meaning is poor button design. (a) False (b) True
28. 28.Which colour pair is easy to read? (a) light grey on white (b) white on dark green (c) yellow on white (d) pale pink on white
29. 29.Which colour pair is hard to read? (a) white on black (b) light grey on white (c) dark blue on white (d) white on dark green
30. 30.🔘 Is this good or poor button design: a big, easy tap area? (a) poor design (b) good design
31. 31.True or false: a big, easy tap area is poor button design. (a) True (b) False
32. 32.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 64 px tall
    Save button: 48 px tall
    Start button: 32 px tall (a) Start (b) Save (c) Help
33. 33.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 48 px tall
    Help button: 52 px tall
    Cancel button: 48 px tall
    Start button: 40 px tall (a) Start (b) Help (c) Cancel (d) Next
34. 34.🔘 Our rule: buttons are at least 48 px tall. The Done button is 20 px tall. How many px taller must it be?
35. 35.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 68 px tall
    Back button: 60 px tall
    Cancel button: 36 px tall (a) Cancel (b) Save (c) Back
36. 36.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 32 px tall. How many px taller must it be?
37. 37.True or false: grey text on grey is good button design. (a) True (b) False
38. 38.🔘 Our rule: buttons are at least 48 px tall. The Save button is 20 px tall. How many px taller must it be?
39. 39.🌗 Is light grey on white easy or hard to read on a button? (a) easy to read (b) hard to read
40. 40.🔘 Is this good or poor button design: a clear word like Save? (a) poor design (b) good design

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