App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 455 · 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. The Start button is 40 px tall. How many px taller must it be?
2. 2.🌗 Is light grey on white easy or hard to read on a button? (a) hard to read (b) easy to read
3. 3.🔘 Is this good or poor button design: a clear word like Save? (a) poor design (b) good design
4. 4.Which colour pair is hard to read? (a) yellow on white (b) white on dark green (c) black on yellow (d) black on pale grey
5. 5.Which colour pair is hard to read? (a) dark blue on white (b) light grey on white (c) white on black (d) white on dark green
6. 6.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Start button: 44 px tall
   Next button: 52 px tall
   Help button: 56 px tall
   Save button: 32 px tall
7. 7.Which colour pair is hard to read? (a) black on pale grey (b) white on black (c) dark blue on black (d) dark blue on white
8. 8.🔘 Our rule: buttons are at least 48 px tall. The Next button is 36 px tall. How many px taller must it be?
9. 9.🔘 Our rule: buttons are at least 48 px tall. The Help button is 40 px tall. How many px taller must it be?
10. 10.🔘 Our rule: buttons are at least 48 px tall. The Start button is 36 px tall. How many px taller must it be?
11. 11.True or false: a clear word like Save is good button design. (a) False (b) True
12. 12.True or false: space between buttons is good button design. (a) False (b) True
13. 13.🌗 Is yellow on white easy or hard to read on a button? (a) easy to read (b) hard to read
14. 14.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 64 px tall
    Save button: 64 px tall
    Send button: 32 px tall (a) Send (b) Save (c) Back
15. 15.🔘 Our rule: buttons are at least 48 px tall. The Save button is 20 px tall. How many px taller must it be?
16. 16.Which colour pair is easy to read? (a) yellow on white (b) red on green (c) dark blue on black (d) dark blue on white
17. 17.Which colour pair is hard to read? (a) black on pale grey (b) white on dark green (c) red on green (d) dark blue on white
18. 18.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 28 px tall
    Next button: 48 px tall
    Done button: 60 px tall
    Cancel button: 72 px tall (a) Done (b) Cancel (c) Next (d) Help
19. 19.True or false: icons with no meaning is good button design. (a) True (b) False
20. 20.🌗 Is black on yellow easy or hard to read on a button? (a) hard to read (b) easy to read
21. 21.🔘 Is this good or poor button design: grey text on grey? (a) good design (b) poor design
22. 22.🔘 Our rule: buttons are at least 48 px tall. The Send button is 20 px tall. How many px taller must it be?
23. 23.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 60 px tall
    Back button: 60 px tall
    Help button: 68 px tall
    Done button: 44 px tall (a) Done (b) Back (c) Next (d) Help
24. 24.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 56 px tall
    Cancel button: 56 px tall
    Send button: 36 px tall
    Back button: 64 px tall (a) Send (b) Save (c) Back (d) Cancel
25. 25.🔘 Is this good or poor button design: strong colour contrast? (a) good design (b) poor design
26. 26.True or false: strong colour contrast is good button design. (a) False (b) True
27. 27.🌗 Is white on black easy or hard to read on a button? (a) easy to read (b) hard to read
28. 28.True or false: space between buttons is poor button design. (a) True (b) False
29. 29.🌗 Is white on dark green easy or hard to read on a button? (a) easy to read (b) hard to read
30. 30.🔘 Our rule: buttons are at least 48 px tall. The Send button is 36 px tall. How many px taller must it be?
31. 31.🔘 Is this good or poor button design: space between buttons? (a) poor design (b) good design
32. 32.🌗 Is dark blue on black 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. Which button is too small?
    Cancel button: 28 px tall
    Done button: 72 px tall
    Start button: 56 px tall (a) Done (b) Start (c) Cancel
34. 34.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 44 px tall
    Save button: 44 px tall
    Next button: 56 px tall
    Send button: 40 px tall
35. 35.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 56 px tall
    Back button: 52 px tall
    Save button: 48 px tall
    Next button: 44 px tall (a) Cancel (b) Back (c) Save (d) Next
36. 36.🔘 Our rule: buttons are at least 48 px tall. The Back button is 40 px tall. How many px taller must it be?
37. 37.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 48 px tall
    Start button: 52 px tall
    Done button: 36 px tall (a) Start (b) Done (c) Save
38. 38.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 56 px tall
    Save button: 52 px tall
    Start button: 28 px tall (a) Cancel (b) Start (c) Save
39. 39.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 36 px tall
    Done button: 48 px tall
    Start button: 48 px tall (a) Done (b) Start (c) Cancel
40. 40.🔘 Is this good or poor button design: icons with no meaning? (a) good design (b) poor design

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