App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 139 · 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. Which button is too small?
   Help button: 52 px tall
   Cancel button: 52 px tall
   Save button: 40 px tall (a) Cancel (b) Save (c) Help
2. 2.True or false: strong colour contrast is poor button design. (a) True (b) False
3. 3.Which colour pair is hard to read? (a) black on pale grey (b) white on dark green (c) dark blue on white (d) dark blue on black
4. 4.🔘 Is this good or poor button design: a clear word like Save? (a) poor design (b) good design
5. 5.🌗 Is white on black easy or hard to read on a button? (a) easy to read (b) hard to read
6. 6.🔘 Is this good or poor button design: grey text on grey? (a) good design (b) poor design
7. 7.🔘 Our rule: buttons are at least 48 px tall. The Done button is 40 px tall. How many px taller must it be?
8. 8.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Save button: 60 px tall
   Help button: 24 px tall
   Done button: 64 px tall (a) Save (b) Help (c) Done
9. 9.Which colour pair is easy to read? (a) yellow on white (b) light grey on white (c) black on pale grey (d) dark blue on black
10. 10.Which colour pair is hard to read? (a) black on yellow (b) pale pink on white (c) white on dark green (d) black on pale grey
11. 11.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 52 px tall
    Send button: 64 px tall
    Save button: 60 px tall
    Next button: 48 px tall
12. 12.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 40 px tall
    Cancel button: 64 px tall
    Send button: 52 px tall
13. 13.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 64 px tall
    Save button: 32 px tall
    Next button: 32 px tall
    Cancel button: 36 px tall
14. 14.🌗 Is yellow on white 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: a big, easy tap area? (a) poor design (b) good design
16. 16.True or false: a clear word like Save is poor button design. (a) False (b) True
17. 17.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 52 px tall
    Done button: 72 px tall
    Save button: 40 px tall (a) Done (b) Back (c) Save
18. 18.🔘 Is this good or poor button design: space between buttons? (a) good design (b) poor design
19. 19.🔘 Our rule: buttons are at least 48 px tall. The Send button is 36 px tall. How many px taller must it be?
20. 20.Which colour pair is hard to read? (a) black on pale grey (b) dark blue on white (c) white on dark green (d) yellow on white
21. 21.🔘 Is this good or poor button design: buttons almost touching? (a) poor design (b) good design
22. 22.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 60 px tall
    Done button: 40 px tall
    Save button: 52 px tall
    Send button: 72 px tall (a) Send (b) Cancel (c) Save (d) Done
23. 23.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 56 px tall
    Start button: 56 px tall
    Next button: 60 px tall
    Done button: 40 px tall
24. 24.🔘 Our rule: buttons are at least 48 px tall. The Save button is 24 px tall. How many px taller must it be?
25. 25.🔘 Our rule: buttons are at least 48 px tall. The Next button is 28 px tall. How many px taller must it be?
26. 26.🔘 Is this good or poor button design: icons with no meaning? (a) good design (b) poor design
27. 27.🌗 Is dark blue on black easy or hard to read on a button? (a) hard to read (b) easy to read
28. 28.🌗 Is black on yellow easy or hard to read on a button? (a) hard to read (b) easy to read
29. 29.🔘 Our rule: buttons are at least 48 px tall. The Help button is 24 px tall. How many px taller must it be?
30. 30.🌗 Is red on green easy or hard to read on a button? (a) easy to read (b) hard to read
31. 31.🔘 Our rule: buttons are at least 48 px tall. The Done button is 36 px tall. How many px taller must it be?
32. 32.True or false: a big, easy tap area is good button design. (a) True (b) False
33. 33.Which colour pair is hard to read? (a) dark blue on white (b) black on yellow (c) red on green (d) white on dark green
34. 34.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 40 px tall
    Next button: 52 px tall
    Send button: 40 px tall
35. 35.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 56 px tall
    Help button: 44 px tall
    Back button: 72 px tall (a) Help (b) Back (c) Save
36. 36.True or false: a tiny 20 px button is good button design. (a) False (b) True
37. 37.Which colour pair is easy to read? (a) red on green (b) dark blue on black (c) white on black (d) light grey on white
38. 38.True or false: a tiny 20 px button is poor button design. (a) True (b) False
39. 39.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 72 px tall
    Help button: 56 px tall
    Send button: 72 px tall
    Save button: 24 px tall (a) Send (b) Help (c) Save (d) Back
40. 40.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 48 px tall
    Start button: 60 px tall
    Next button: 56 px tall
    Help button: 64 px tall

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