App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 504 · 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?
   Cancel button: 36 px tall
   Start button: 36 px tall
   Save button: 56 px tall
2. 2.🌗 Is dark blue on white easy or hard to read on a button? (a) hard to read (b) easy to read
3. 3.True or false: a tiny 20 px button is poor button design. (a) False (b) True
4. 4.🔘 Is this good or poor button design: space between buttons? (a) poor design (b) good design
5. 5.🔘 Is this good or poor button design: a clear word like Save? (a) poor design (b) good design
6. 6.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Cancel button: 64 px tall
   Help button: 48 px tall
   Back button: 32 px tall (a) Help (b) Back (c) Cancel
7. 7.🔘 Is this good or poor button design: a big, easy tap area? (a) good design (b) poor design
8. 8.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Next button: 56 px tall
   Help button: 44 px tall
   Done button: 68 px tall (a) Done (b) Next (c) Help
9. 9.Which colour pair is easy to read? (a) yellow on white (b) white on dark green (c) dark blue on black (d) light grey on white
10. 10.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 72 px tall
    Send button: 40 px tall
    Done button: 48 px tall
    Back button: 64 px tall (a) Send (b) Back (c) Cancel (d) Done
11. 11.🔘 Our rule: buttons are at least 48 px tall. The Send button is 24 px tall. How many px taller must it be?
12. 12.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 52 px tall
    Next button: 40 px tall
    Start button: 72 px tall (a) Cancel (b) Start (c) Next
13. 13.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 48 px tall
    Back button: 44 px tall
    Start button: 56 px tall
14. 14.🌗 Is white on dark green easy or hard to read on a button? (a) hard to read (b) easy to read
15. 15.🔘 Is this good or poor button design: grey text on grey? (a) good design (b) poor design
16. 16.🔘 Is this good or poor button design: a tiny 20 px button? (a) good design (b) poor design
17. 17.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 68 px tall
    Help button: 52 px tall
    Cancel button: 24 px tall (a) Start (b) Help (c) Cancel
18. 18.🌗 Is black on yellow easy or hard to read on a button? (a) hard to read (b) easy to read
19. 19.True or false: grey text on grey is poor button design. (a) True (b) False
20. 20.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 52 px tall
    Done button: 68 px tall
    Help button: 44 px tall (a) Help (b) Start (c) Done
21. 21.🔘 Is this good or poor button design: buttons almost touching? (a) good design (b) poor design
22. 22.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 64 px tall
    Next button: 60 px tall
    Start button: 48 px tall
    Done button: 32 px tall
23. 23.🌗 Is light grey 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. The Cancel button is 28 px tall. How many px taller must it be?
25. 25.🔘 Is this good or poor button design: icons with no meaning? (a) poor design (b) good design
26. 26.🌗 Is white on black easy or hard to read on a button? (a) easy to read (b) hard to read
27. 27.Which colour pair is hard to read? (a) white on black (b) black on pale grey (c) black on yellow (d) light grey on white
28. 28.🔘 Our rule: buttons are at least 48 px tall. The Help button is 36 px tall. How many px taller must it be?
29. 29.True or false: strong colour contrast is poor button design. (a) True (b) False
30. 30.Which colour pair is easy to read? (a) red on green (b) yellow on white (c) black on pale grey (d) dark blue on black
31. 31.Which colour pair is hard to read? (a) black on yellow (b) black on pale grey (c) white on black (d) dark blue on black
32. 32.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 44 px tall
    Help button: 48 px tall
    Send button: 48 px tall
    Next button: 56 px tall (a) Send (b) Help (c) Next (d) Save
33. 33.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 60 px tall
    Cancel button: 28 px tall
    Back button: 56 px tall (a) Cancel (b) Done (c) Back
34. 34.🌗 Is yellow on white easy or hard to read on a button? (a) easy to read (b) hard to read
35. 35.Which colour pair is easy to read? (a) red on green (b) black on yellow (c) dark blue on black (d) yellow on white
36. 36.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 64 px tall
    Help button: 36 px tall
    Cancel button: 64 px tall
    Back button: 40 px tall
37. 37.True or false: a big, easy tap area is good button design. (a) False (b) True
38. 38.True or false: icons with no meaning is good button design. (a) True (b) False
39. 39.True or false: a clear word like Save is poor button design. (a) True (b) False
40. 40.🔘 Is this good or poor button design: strong colour contrast? (a) good design (b) poor design

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