App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 140 · 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.True or false: strong colour contrast is poor button design. (a) True (b) False
2. 2.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Send button: 60 px tall
   Back button: 48 px tall
   Done button: 52 px tall
3. 3.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Send button: 40 px tall
   Cancel button: 64 px tall
   Next button: 60 px tall (a) Send (b) Next (c) Cancel
4. 4.🌗 Is black on yellow easy or hard to read on a button? (a) hard to read (b) easy to read
5. 5.True or false: icons with no meaning is good button design. (a) True (b) False
6. 6.🔘 Is this good or poor button design: strong colour contrast? (a) poor design (b) good design
7. 7.🔘 Is this good or poor button design: a tiny 20 px button? (a) poor design (b) good design
8. 8.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Save button: 40 px tall
   Start button: 60 px tall
   Help button: 32 px tall
9. 9.🌗 Is dark blue on white easy or hard to read on a button? (a) hard to read (b) easy to read
10. 10.Which colour pair is easy to read? (a) dark blue on black (b) black on yellow (c) yellow on white (d) red on green
11. 11.Which colour pair is easy to read? (a) red on green (b) dark blue on white (c) dark blue on black (d) yellow on white
12. 12.🔘 Is this good or poor button design: space between buttons? (a) poor design (b) good design
13. 13.🔘 Is this good or poor button design: a big, easy tap area? (a) poor design (b) good design
14. 14.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 52 px tall
    Cancel button: 48 px tall
    Send button: 44 px tall
15. 15.Which colour pair is hard to read? (a) dark blue on black (b) white on dark green (c) dark blue on white (d) black on pale grey
16. 16.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 56 px tall
    Next button: 60 px tall
    Done button: 32 px tall (a) Send (b) Next (c) Done
17. 17.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 64 px tall
    Done button: 32 px tall
    Help button: 72 px tall (a) Next (b) Help (c) Done
18. 18.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 52 px tall
    Save button: 60 px tall
    Next button: 44 px tall (a) Next (b) Save (c) Help
19. 19.True or false: space between buttons is poor button design. (a) True (b) False
20. 20.Which colour pair is easy to read? (a) light grey on white (b) yellow on white (c) pale pink on white (d) black on pale grey
21. 21.Which colour pair is hard to read? (a) light grey on white (b) white on dark green (c) black on yellow (d) dark blue on white
22. 22.Which colour pair is easy to read? (a) red on green (b) light grey on white (c) white on black (d) yellow on white
23. 23.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 20 px tall. How many px taller must it be?
24. 24.True or false: a tiny 20 px button is good button design. (a) True (b) False
25. 25.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 60 px tall
    Done button: 64 px tall
    Cancel button: 44 px tall
    Back button: 56 px tall
26. 26.🔘 Our rule: buttons are at least 48 px tall. The Help button is 36 px tall. How many px taller must it be?
27. 27.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 64 px tall
    Help button: 40 px tall
    Back button: 40 px tall
28. 28.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 28 px tall
    Next button: 56 px tall
    Help button: 60 px tall (a) Next (b) Help (c) Send
29. 29.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 28 px tall
    Done button: 68 px tall
    Cancel button: 68 px tall (a) Back (b) Done (c) Cancel
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.Which colour pair is hard to read? (a) black on pale grey (b) white on dark green (c) red on green (d) black on yellow
32. 32.🌗 Is light grey on white easy or hard to read on a button? (a) hard to read (b) easy to read
33. 33.🔘 Our rule: buttons are at least 48 px tall. The Send button is 28 px tall. How many px taller must it be?
34. 34.🔘 Our rule: buttons are at least 48 px tall. The Save button is 40 px tall. How many px taller must it be?
35. 35.True or false: a clear word like Save is good button design. (a) False (b) True
36. 36.Which colour pair is hard to read? (a) yellow on white (b) black on yellow (c) white on black (d) dark blue on white
37. 37.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 60 px tall
    Cancel button: 56 px tall
    Send button: 52 px tall
    Back button: 64 px tall
38. 38.🔘 Our rule: buttons are at least 48 px tall. The Send button is 32 px tall. How many px taller must it be?
39. 39.🔘 Is this good or poor button design: grey text on grey? (a) good design (b) poor design
40. 40.🌗 Is pale pink on white easy or hard to read on a button? (a) easy to read (b) hard to read

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