App Dev Worksheet: Button Size and Contrast

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

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