App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 253 · 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.Which colour pair is hard to read? (a) black on yellow (b) red on green (c) dark blue on white (d) black on pale grey
2. 2.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Cancel button: 60 px tall
   Next button: 48 px tall
   Start button: 60 px tall
   Help button: 32 px tall
3. 3.🌗 Is dark blue on black easy or hard to read on a button? (a) hard to read (b) easy to read
4. 4.🔘 Is this good or poor button design: icons with no meaning? (a) poor design (b) good design
5. 5.🌗 Is white on black easy or hard to read on a button? (a) hard to read (b) easy to read
6. 6.True or false: space between buttons is good button design. (a) True (b) False
7. 7.🌗 Is pale pink on white easy or hard to read on a button? (a) easy to read (b) hard to read
8. 8.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Cancel button: 48 px tall
   Back button: 60 px tall
   Save button: 64 px tall
   Start button: 24 px tall (a) Start (b) Back (c) Cancel (d) Save
9. 9.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Help button: 32 px tall
   Cancel button: 44 px tall
   Next button: 44 px tall
10. 10.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 60 px tall
    Save button: 48 px tall
    Next button: 40 px tall (a) Next (b) Cancel (c) Save
11. 11.Which colour pair is hard to read? (a) dark blue on white (b) dark blue on black (c) black on pale grey (d) white on black
12. 12.True or false: grey text on grey is good button design. (a) True (b) False
13. 13.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 32 px tall. How many px taller must it be?
14. 14.🔘 Our rule: buttons are at least 48 px tall. The Start button is 28 px tall. How many px taller must it be?
15. 15.True or false: strong colour contrast is good button design. (a) False (b) True
16. 16.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 72 px tall
    Save button: 24 px tall
    Next button: 56 px tall
    Cancel button: 48 px tall (a) Save (b) Next (c) Cancel (d) Done
17. 17.Which colour pair is hard to read? (a) black on yellow (b) dark blue on white (c) light grey on white (d) white on dark green
18. 18.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 52 px tall
    Next button: 52 px tall
    Start button: 40 px tall (a) Next (b) Done (c) Start
19. 19.🌗 Is white on dark green easy or hard to read on a button? (a) hard to read (b) easy to read
20. 20.🔘 Our rule: buttons are at least 48 px tall. The Done button is 44 px tall. How many px taller must it be?
21. 21.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 64 px tall
    Done button: 48 px tall
    Save button: 40 px tall
    Start button: 40 px tall
22. 22.Which colour pair is hard to read? (a) white on black (b) yellow on white (c) dark blue on white (d) black on yellow
23. 23.Which colour pair is hard to read? (a) white on dark green (b) white on black (c) pale pink on white (d) black on yellow
24. 24.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 44 px tall
    Done button: 32 px tall
    Cancel button: 56 px tall
25. 25.Which colour pair is easy to read? (a) yellow on white (b) dark blue on black (c) red on green (d) black on yellow
26. 26.🔘 Is this good or poor button design: a tiny 20 px button? (a) poor design (b) good design
27. 27.🔘 Is this good or poor button design: a clear word like Save? (a) poor design (b) good design
28. 28.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 52 px tall
    Help button: 36 px tall
    Send button: 72 px tall
    Cancel button: 48 px tall (a) Next (b) Send (c) Cancel (d) Help
29. 29.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 52 px tall
    Help button: 48 px tall
    Send button: 64 px tall
30. 30.🔘 Our rule: buttons are at least 48 px tall. The Done button is 40 px tall. How many px taller must it be?
31. 31.🔘 Our rule: buttons are at least 48 px tall. The Start button is 24 px tall. How many px taller must it be?
32. 32.🔘 Our rule: buttons are at least 48 px tall. The Start button is 40 px tall. How many px taller must it be?
33. 33.🔘 Our rule: buttons are at least 48 px tall. The Start button is 44 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?
    Cancel button: 32 px tall
    Start button: 52 px tall
    Send button: 60 px tall
    Help button: 48 px tall (a) Help (b) Send (c) Cancel (d) Start
35. 35.🔘 Our rule: buttons are at least 48 px tall. The Save button is 24 px tall. How many px taller must it be?
36. 36.🌗 Is dark blue on white easy or hard to read on a button? (a) easy to read (b) hard to read
37. 37.True or false: icons with no meaning is good button design. (a) False (b) True
38. 38.🔘 Our rule: buttons are at least 48 px tall. The Send button is 24 px tall. How many px taller must it be?
39. 39.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 72 px tall
    Help button: 68 px tall
    Save button: 32 px tall (a) Help (b) Back (c) Save
40. 40.Which colour pair is easy to read? (a) yellow on white (b) red on green (c) white on dark green (d) dark blue on black

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