App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 361 · 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: 48 px tall
   Help button: 32 px tall
   Send button: 52 px tall
2. 2.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 44 px tall. How many px taller must it be?
3. 3.Which colour pair is easy to read? (a) yellow on white (b) pale pink on white (c) black on yellow (d) light grey on white
4. 4.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 36 px tall. How many px taller must it be?
5. 5.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Done button: 52 px tall
   Help button: 24 px tall
   Cancel button: 52 px tall (a) Help (b) Cancel (c) Done
6. 6.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Next button: 32 px tall
   Done button: 48 px tall
   Help button: 56 px tall
   Cancel button: 48 px tall
7. 7.🌗 Is white on black easy or hard to read on a button? (a) easy to read (b) hard to read
8. 8.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Help button: 60 px tall
   Next button: 32 px tall
   Back button: 44 px tall
9. 9.True or false: a clear word like Save is poor button design. (a) False (b) True
10. 10.True or false: a clear word like Save is good button design. (a) False (b) True
11. 11.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 60 px tall
    Save button: 48 px tall
    Next button: 28 px tall
    Send button: 64 px tall (a) Save (b) Next (c) Send (d) Cancel
12. 12.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 52 px tall
    Start button: 36 px tall
    Back button: 72 px tall (a) Back (b) Start (c) Help
13. 13.🔘 Is this good or poor button design: a tiny 20 px button? (a) good design (b) poor design
14. 14.Which colour pair is hard to read? (a) white on black (b) dark blue on black (c) dark blue on white (d) black on pale grey
15. 15.🔘 Is this good or poor button design: a clear word like Save? (a) poor design (b) good design
16. 16.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 32 px tall
    Start button: 52 px tall
    Cancel button: 40 px tall
17. 17.🌗 Is dark blue on black easy or hard to read on a button? (a) easy to read (b) hard to read
18. 18.🔘 Our rule: buttons are at least 48 px tall. The Next button is 20 px tall. How many px taller must it be?
19. 19.🌗 Is pale pink on white easy or hard to read on a button? (a) easy to read (b) hard to read
20. 20.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 48 px tall
    Save button: 28 px tall
    Send button: 52 px tall
    Help button: 72 px tall (a) Cancel (b) Save (c) Send (d) Help
21. 21.🔘 Is this good or poor button design: buttons almost touching? (a) good design (b) poor design
22. 22.🔘 Is this good or poor button design: grey text on grey? (a) good design (b) poor design
23. 23.True or false: a tiny 20 px button is good button design. (a) True (b) False
24. 24.Which colour pair is hard to read? (a) dark blue on white (b) black on pale grey (c) yellow on white (d) white on dark green
25. 25.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 48 px tall
    Start button: 68 px tall
    Send button: 24 px tall
    Next button: 52 px tall (a) Start (b) Back (c) Send (d) Next
26. 26.🔘 Our rule: buttons are at least 48 px tall. The Done button is 24 px tall. How many px taller must it be?
27. 27.🔘 Our rule: buttons are at least 48 px tall. The Done button is 32 px tall. How many px taller must it be?
28. 28.True or false: strong colour contrast is poor button design. (a) False (b) True
29. 29.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 72 px tall
    Help button: 28 px tall
    Next button: 52 px tall (a) Help (b) Next (c) Done
30. 30.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 36 px tall
    Help button: 36 px tall
    Send button: 36 px tall
    Save button: 48 px tall
31. 31.Which colour pair is easy to read? (a) light grey on white (b) red on green (c) white on black (d) dark blue on black
32. 32.🔘 Our rule: buttons are at least 48 px tall. The Save button is 36 px tall. How many px taller must it be?
33. 33.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 60 px tall
    Next button: 52 px tall
    Save button: 36 px tall
    Send button: 52 px tall
34. 34.True or false: grey text on grey is good button design. (a) True (b) False
35. 35.True or false: a big, easy tap area is good button design. (a) False (b) True
36. 36.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 40 px tall
    Save button: 32 px tall
    Next button: 52 px tall
    Start button: 32 px tall
37. 37.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 60 px tall
    Cancel button: 24 px tall
    Next button: 56 px tall
    Start button: 68 px tall (a) Save (b) Start (c) Cancel (d) Next
38. 38.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 44 px tall
    Done button: 64 px tall
    Start button: 32 px tall
39. 39.🔘 Is this good or poor button design: icons with no meaning? (a) poor design (b) good design
40. 40.🌗 Is black on yellow easy or hard to read on a button? (a) hard to read (b) easy to read

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