App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 174 · 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?
   Cancel button: 48 px tall
   Save button: 60 px tall
   Start button: 64 px tall
2. 2.🌗 Is black on yellow easy or hard to read on a button? (a) hard to read (b) easy to read
3. 3.🌗 Is dark blue on white easy or hard to read on a button? (a) hard to read (b) easy to read
4. 4.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 28 px tall. How many px taller must it be?
5. 5.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Send button: 36 px tall
   Back button: 48 px tall
   Start button: 64 px tall
   Next button: 60 px tall
6. 6.🔘 Our rule: buttons are at least 48 px tall. The Back button is 24 px tall. How many px taller must it be?
7. 7.🔘 Is this good or poor button design: a big, easy tap area? (a) good design (b) poor design
8. 8.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Save button: 56 px tall
   Start button: 44 px tall
   Cancel button: 40 px tall
9. 9.🌗 Is white on black easy or hard to read on a button? (a) easy to read (b) hard to read
10. 10.🌗 Is red on green easy or hard to read on a button? (a) easy to read (b) hard to read
11. 11.🔘 Is this good or poor button design: strong colour contrast? (a) poor design (b) good design
12. 12.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 44 px tall
    Back button: 56 px tall
    Done button: 48 px tall
    Save button: 68 px tall (a) Save (b) Back (c) Done (d) Send
13. 13.True or false: grey text on grey is poor button design. (a) True (b) False
14. 14.🔘 Our rule: buttons are at least 48 px tall. The Back button is 36 px tall. How many px taller must it be?
15. 15.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 24 px tall. How many px taller must it be?
16. 16.Which colour pair is hard to read? (a) black on yellow (b) dark blue on white (c) light grey on white (d) black on pale grey
17. 17.Which colour pair is hard to read? (a) red on green (b) black on yellow (c) white on black (d) white on dark green
18. 18.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 60 px tall
    Cancel button: 28 px tall
    Back button: 52 px tall (a) Back (b) Cancel (c) Send
19. 19.🔘 Our rule: buttons are at least 48 px tall. The Start button is 32 px tall. How many px taller must it be?
20. 20.🔘 Is this good or poor button design: space between buttons? (a) good design (b) poor design
21. 21.True or false: a tiny 20 px button is poor button design. (a) True (b) False
22. 22.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 32 px tall
    Start button: 56 px tall
    Done button: 64 px tall
    Send button: 44 px tall
23. 23.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 20 px tall. How many px taller must it be?
24. 24.🌗 Is black on pale grey easy or hard to read on a button? (a) hard to read (b) easy to read
25. 25.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 64 px tall
    Cancel button: 48 px tall
    Save button: 36 px tall
26. 26.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 60 px tall
    Done button: 60 px tall
    Save button: 64 px tall
    Send button: 40 px tall
27. 27.🔘 Is this good or poor button design: buttons almost touching? (a) good design (b) poor design
28. 28.True or false: a big, easy tap area is good button design. (a) True (b) False
29. 29.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 40 px tall
    Start button: 48 px tall
    Help button: 40 px tall
30. 30.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 36 px tall
    Help button: 52 px tall
    Start button: 52 px tall (a) Start (b) Back (c) Help
31. 31.🔘 Our rule: buttons are at least 48 px tall. The Next button is 20 px tall. How many px taller must it be?
32. 32.🔘 Is this good or poor button design: grey text on grey? (a) poor design (b) good design
33. 33.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 72 px tall
    Cancel button: 60 px tall
    Save button: 40 px tall
    Start button: 60 px tall (a) Cancel (b) Save (c) Next (d) Start
34. 34.True or false: strong colour contrast is poor button design. (a) False (b) True
35. 35.Which colour pair is hard to read? (a) white on black (b) white on dark green (c) dark blue on black (d) black on pale grey
36. 36.Which colour pair is easy to read? (a) light grey on white (b) pale pink on white (c) dark blue on white (d) red on green
37. 37.True or false: a clear word like Save is poor button design. (a) True (b) False
38. 38.🌗 Is pale pink 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. How many of these buttons follow the rule?
    Done button: 40 px tall
    Cancel button: 40 px tall
    Help button: 48 px tall
40. 40.True or false: icons with no meaning is poor button design. (a) False (b) True

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