App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 537 · 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. How many of these buttons follow the rule?
   Start button: 32 px tall
   Done button: 36 px tall
   Back button: 36 px tall
   Help button: 60 px tall
2. 2.🔘 Our rule: buttons are at least 48 px tall. The Start button is 24 px tall. How many px taller must it be?
3. 3.🌗 Is white on dark green easy or hard to read on a button? (a) hard to read (b) easy to read
4. 4.True or false: buttons almost touching is poor button design. (a) False (b) True
5. 5.🔘 Is this good or poor button design: a big, easy tap area? (a) good design (b) poor design
6. 6.Which colour pair is easy to read? (a) dark blue on black (b) yellow on white (c) dark blue on white (d) red on green
7. 7.🔘 Is this good or poor button design: a clear word like Save? (a) poor design (b) good design
8. 8.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 32 px tall. How many px taller must it be?
9. 9.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Cancel button: 32 px tall
   Next button: 56 px tall
   Start button: 48 px tall
   Send button: 48 px tall (a) Start (b) Cancel (c) Send (d) Next
10. 10.Which colour pair is hard to read? (a) red on green (b) dark blue on white (c) white on dark green (d) black on yellow
11. 11.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 64 px tall
    Back button: 48 px tall
    Start button: 32 px tall
12. 12.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 52 px tall
    Cancel button: 60 px tall
    Next button: 24 px tall (a) Cancel (b) Next (c) Done
13. 13.Which colour pair is easy to read? (a) yellow on white (b) red on green (c) white on black (d) pale pink on white
14. 14.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 48 px tall
    Start button: 44 px tall
    Back button: 44 px tall
15. 15.🌗 Is dark blue on white easy or hard to read on a button? (a) hard to read (b) easy to read
16. 16.True or false: space between buttons is poor button design. (a) True (b) False
17. 17.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 32 px tall
    Start button: 36 px tall
    Cancel button: 60 px tall
18. 18.True or false: a tiny 20 px button is poor button design. (a) True (b) False
19. 19.🌗 Is black on yellow easy or hard to read on a button? (a) easy to read (b) hard to read
20. 20.True or false: a clear word like Save is poor button design. (a) False (b) True
21. 21.🔘 Is this good or poor button design: strong colour contrast? (a) good design (b) poor design
22. 22.🌗 Is pale pink on white easy or hard to read on a button? (a) easy to read (b) hard to read
23. 23.🔘 Our rule: buttons are at least 48 px tall. The Done button is 24 px tall. How many px taller must it be?
24. 24.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 52 px tall
    Cancel button: 44 px tall
    Start button: 60 px tall
    Back button: 68 px tall (a) Back (b) Cancel (c) Send (d) Start
25. 25.True or false: grey text on grey is poor button design. (a) True (b) False
26. 26.True or false: icons with no meaning is poor button design. (a) True (b) False
27. 27.🔘 Is this good or poor button design: icons with no meaning? (a) good design (b) poor design
28. 28.🌗 Is white on black 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. Which button is too small?
    Start button: 72 px tall
    Help button: 36 px tall
    Send button: 72 px tall
    Save button: 72 px tall (a) Start (b) Help (c) Save (d) Send
30. 30.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 60 px tall
    Cancel button: 56 px tall
    Save button: 68 px tall
    Start button: 36 px tall (a) Save (b) Cancel (c) Start (d) Next
31. 31.Which colour pair is easy to read? (a) light grey on white (b) pale pink on white (c) red on green (d) white on dark green
32. 32.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 56 px tall
    Next button: 56 px tall
    Back button: 28 px tall (a) Next (b) Back (c) Save
33. 33.Which colour pair is hard to read? (a) black on yellow (b) dark blue on white (c) yellow on white (d) white on black
34. 34.True or false: a clear word like Save is good button design. (a) True (b) False
35. 35.🔘 Our rule: buttons are at least 48 px tall. The Send button is 40 px tall. How many px taller must it be?
36. 36.True or false: space between buttons is good button design. (a) False (b) True
37. 37.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 40 px tall
    Back button: 36 px tall
    Done button: 56 px tall
    Help button: 40 px tall
38. 38.True or false: a big, easy tap area is poor button design. (a) True (b) False
39. 39.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 52 px tall
    Done button: 60 px tall
    Next button: 32 px tall (a) Save (b) Next (c) Done
40. 40.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 52 px tall
    Back button: 56 px tall
    Send button: 72 px tall
    Cancel button: 44 px tall (a) Cancel (b) Help (c) Send (d) Back

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