App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 326 · 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?
   Save button: 64 px tall
   Send button: 44 px tall
   Cancel button: 60 px tall
   Start button: 40 px tall
2. 2.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Next button: 56 px tall
   Start button: 68 px tall
   Done button: 32 px tall
   Send button: 72 px tall (a) Start (b) Next (c) Send (d) Done
3. 3.True or false: space between buttons is poor button design. (a) False (b) True
4. 4.Which colour pair is hard to read? (a) dark blue on black (b) white on black (c) white on dark green (d) black on yellow
5. 5.🌗 Is white on dark green easy or hard to read on a button? (a) easy to read (b) hard to read
6. 6.🌗 Is black on yellow easy or hard to read on a button? (a) hard to read (b) easy to read
7. 7.Which colour pair is hard to read? (a) black on pale grey (b) black on yellow (c) light grey on white (d) dark blue on white
8. 8.True or false: a big, easy tap area is good button design. (a) False (b) True
9. 9.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Back button: 56 px tall
   Next button: 52 px tall
   Cancel button: 64 px tall
10. 10.🔘 Is this good or poor button design: space between buttons? (a) poor design (b) good design
11. 11.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 48 px tall
    Next button: 52 px tall
    Cancel button: 60 px tall
    Start button: 60 px tall
12. 12.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 48 px tall
    Start button: 64 px tall
    Done button: 48 px tall
    Save button: 64 px tall
13. 13.🌗 Is red on green easy or hard to read on a button? (a) hard to read (b) easy to read
14. 14.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 48 px tall
    Send button: 48 px tall
    Cancel button: 64 px tall
    Start button: 60 px tall
15. 15.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 56 px tall
    Help button: 40 px tall
    Cancel button: 64 px tall
    Save button: 36 px tall
16. 16.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 72 px tall
    Save button: 32 px tall
    Cancel button: 60 px tall
    Start button: 72 px tall (a) Cancel (b) Back (c) Start (d) Save
17. 17.🔘 Is this good or poor button design: icons with no meaning? (a) poor design (b) good design
18. 18.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 28 px tall. How many px taller must it be?
19. 19.🔘 Is this good or poor button design: a big, easy tap area? (a) poor design (b) good design
20. 20.🔘 Our rule: buttons are at least 48 px tall. The Back button is 36 px tall. How many px taller must it be?
21. 21.True or false: strong colour contrast is good button design. (a) False (b) True
22. 22.🔘 Is this good or poor button design: grey text on grey? (a) good design (b) poor design
23. 23.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 44 px tall. How many px taller must it be?
24. 24.True or false: icons with no meaning is good button design. (a) True (b) False
25. 25.🌗 Is light grey on white easy or hard to read on a button? (a) hard to read (b) easy to read
26. 26.True or false: strong colour contrast is poor button design. (a) False (b) True
27. 27.Which colour pair is hard to read? (a) yellow on white (b) black on pale grey (c) white on dark green (d) dark blue on white
28. 28.🔘 Our rule: buttons are at least 48 px tall. The Help button is 24 px tall. How many px taller must it be?
29. 29.🌗 Is black on pale grey easy or hard to read on a button? (a) hard to read (b) easy to read
30. 30.🌗 Is dark blue on black easy or hard to read on a button? (a) hard to read (b) easy to read
31. 31.🔘 Our rule: buttons are at least 48 px tall. The Save button is 24 px tall. How many px taller must it be?
32. 32.🔘 Is this good or poor button design: a tiny 20 px button? (a) good design (b) poor design
33. 33.🔘 Our rule: buttons are at least 48 px tall. The Back button is 20 px tall. How many px taller must it be?
34. 34.🌗 Is pale pink on white easy or hard to read on a button? (a) hard to read (b) easy to read
35. 35.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 36 px tall
    Done button: 48 px tall
    Cancel button: 60 px tall
    Next button: 64 px tall (a) Save (b) Cancel (c) Next (d) Done
36. 36.True or false: grey text on grey is poor button design. (a) False (b) True
37. 37.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 68 px tall
    Send button: 24 px tall
    Next button: 72 px tall (a) Start (b) Send (c) Next
38. 38.🌗 Is dark blue on white easy or hard to read on a button? (a) hard to read (b) easy to read
39. 39.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 64 px tall
    Cancel button: 64 px tall
    Save button: 32 px tall (a) Cancel (b) Start (c) Save
40. 40.🌗 Is white on black easy or hard to read on a button? (a) easy to read (b) hard to read

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