App Dev Worksheet: Button Size and Contrast

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

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