App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 452 · 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.Which colour pair is easy to read? (a) white on black (b) red on green (c) yellow on white (d) dark blue on black
3. 3.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Back button: 32 px tall
   Save button: 44 px tall
   Start button: 44 px tall
4. 4.True or false: buttons almost touching is poor button design. (a) True (b) False
5. 5.🔘 Our rule: buttons are at least 48 px tall. The Send button is 20 px tall. How many px taller must it be?
6. 6.Which colour pair is easy to read? (a) red on green (b) light grey on white (c) black on pale grey (d) pale pink on white
7. 7.Which colour pair is hard to read? (a) white on dark green (b) black on yellow (c) dark blue on white (d) red on green
8. 8.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Back button: 52 px tall
   Done button: 52 px tall
   Save button: 32 px tall (a) Back (b) Save (c) Done
9. 9.True or false: a big, easy tap area is good button design. (a) True (b) False
10. 10.🔘 Is this good or poor button design: icons with no meaning? (a) poor design (b) good design
11. 11.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 56 px tall
    Save button: 56 px tall
    Help button: 24 px tall (a) Save (b) Done (c) Help
12. 12.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 28 px tall
    Save button: 48 px tall
    Done button: 48 px tall (a) Done (b) Save (c) Cancel
13. 13.True or false: icons with no meaning is good button design. (a) False (b) True
14. 14.🌗 Is black on yellow easy or hard to read on a button? (a) easy to read (b) hard to read
15. 15.Which colour pair is hard to read? (a) light grey on white (b) dark blue on white (c) black on yellow (d) white on black
16. 16.True or false: space between buttons is poor button design. (a) False (b) True
17. 17.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 56 px tall
    Start button: 36 px tall
    Next button: 56 px tall
    Cancel button: 60 px tall
18. 18.🔘 Is this good or poor button design: a tiny 20 px button? (a) good design (b) poor design
19. 19.🔘 Is this good or poor button design: a clear word like Save? (a) poor design (b) good design
20. 20.🔘 Is this good or poor button design: buttons almost touching? (a) poor design (b) good design
21. 21.🌗 Is dark blue on white easy or hard to read on a button? (a) easy to read (b) hard to read
22. 22.🌗 Is red on green easy or hard to read on a button? (a) hard to read (b) easy to read
23. 23.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 56 px tall
    Next button: 60 px tall
    Cancel button: 72 px tall
    Send button: 28 px tall (a) Save (b) Cancel (c) Next (d) Send
24. 24.Which colour pair is easy to read? (a) light grey on white (b) red on green (c) dark blue on black (d) dark blue on white
25. 25.🔘 Is this good or poor button design: grey text on grey? (a) poor design (b) good design
26. 26.🔘 Our rule: buttons are at least 48 px tall. The Save button is 28 px tall. How many px taller must it be?
27. 27.True or false: a clear word like Save is good button design. (a) False (b) True
28. 28.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 52 px tall
    Save button: 56 px tall
    Help button: 40 px tall (a) Send (b) Save (c) Help
29. 29.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 32 px tall
    Done button: 36 px tall
    Cancel button: 44 px tall
    Send button: 48 px tall
30. 30.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 64 px tall
    Send button: 28 px tall
    Done button: 48 px tall (a) Back (b) Done (c) Send
31. 31.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 64 px tall
    Cancel button: 52 px tall
    Save button: 60 px tall
32. 32.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 56 px tall
    Back button: 44 px tall
    Next button: 56 px tall
    Help button: 56 px tall
33. 33.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 36 px tall
    Save button: 40 px tall
    Send button: 56 px tall
    Start button: 60 px tall
34. 34.Which colour pair is easy to read? (a) light grey on white (b) black on yellow (c) red on green (d) yellow on white
35. 35.🌗 Is black on pale grey easy or hard to read on a button? (a) hard to read (b) easy to read
36. 36.🌗 Is yellow on white easy or hard to read on a button? (a) hard to read (b) easy to read
37. 37.Which colour pair is hard to read? (a) black on yellow (b) white on black (c) black on pale grey (d) yellow on white
38. 38.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 60 px tall
    Done button: 64 px tall
    Start button: 40 px tall
    Next button: 48 px tall
39. 39.🔘 Our rule: buttons are at least 48 px tall. The Send button is 36 px tall. How many px taller must it be?
40. 40.True or false: strong colour contrast is poor button design. (a) True (b) False

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