App Dev Worksheet: Button Size and Contrast

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

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