App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 406 · 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?
   Send button: 36 px tall
   Done button: 48 px tall
   Help button: 32 px tall
   Back button: 60 px tall
2. 2.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Send button: 52 px tall
   Next button: 32 px tall
   Back button: 56 px tall
3. 3.🔘 Our rule: buttons are at least 48 px tall. The Save button is 40 px tall. How many px taller must it be?
4. 4.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Next button: 64 px tall
   Help button: 72 px tall
   Save button: 60 px tall
   Cancel button: 32 px tall (a) Next (b) Save (c) Cancel (d) Help
5. 5.🌗 Is yellow on white easy or hard to read on a button? (a) easy to read (b) hard to read
6. 6.Which colour pair is hard to read? (a) white on black (b) pale pink on white (c) dark blue on white (d) white on dark green
7. 7.🔘 Is this good or poor button design: a tiny 20 px button? (a) poor design (b) good design
8. 8.Which colour pair is easy to read? (a) dark blue on white (b) pale pink on white (c) light grey on white (d) red on green
9. 9.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Help button: 64 px tall
   Cancel button: 52 px tall
   Next button: 44 px tall (a) Next (b) Cancel (c) Help
10. 10.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 72 px tall
    Back button: 60 px tall
    Save button: 48 px tall
    Start button: 24 px tall (a) Back (b) Start (c) Save (d) Send
11. 11.🔘 Is this good or poor button design: grey text on grey? (a) good design (b) poor design
12. 12.🔘 Our rule: buttons are at least 48 px tall. The Done button is 44 px tall. How many px taller must it be?
13. 13.Which colour pair is easy to read? (a) yellow on white (b) pale pink on white (c) red on green (d) white on black
14. 14.Which colour pair is easy to read? (a) yellow on white (b) light grey on white (c) red on green (d) white on dark green
15. 15.🌗 Is dark blue on white easy or hard to read on a button? (a) easy to read (b) hard to read
16. 16.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 24 px tall
    Next button: 56 px tall
    Save button: 60 px tall (a) Save (b) Next (c) Send
17. 17.🌗 Is black on pale grey 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. How many of these buttons follow the rule?
    Save button: 44 px tall
    Next button: 64 px tall
    Done button: 56 px tall
19. 19.🌗 Is black on yellow easy or hard to read on a button? (a) hard to read (b) easy to read
20. 20.True or false: strong colour contrast is poor button design. (a) True (b) False
21. 21.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 64 px tall
    Back button: 48 px tall
    Done button: 28 px tall (a) Done (b) Save (c) Back
22. 22.🌗 Is dark blue on black easy or hard to read on a button? (a) easy to read (b) hard to read
23. 23.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 24 px tall
    Start button: 60 px tall
    Next button: 64 px tall (a) Back (b) Next (c) Start
24. 24.True or false: a tiny 20 px button is poor button design. (a) False (b) True
25. 25.True or false: a clear word like Save is good button design. (a) False (b) True
26. 26.True or false: space between buttons is good button design. (a) False (b) True
27. 27.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 60 px tall
    Send button: 64 px tall
    Help button: 28 px tall (a) Next (b) Send (c) Help
28. 28.True or false: icons with no meaning is poor 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?
    Help button: 52 px tall
    Back button: 56 px tall
    Send button: 48 px tall
    Done button: 32 px tall
30. 30.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 28 px tall
    Start button: 68 px tall
    Next button: 48 px tall (a) Cancel (b) Next (c) Start
31. 31.Which colour pair is hard to read? (a) white on black (b) red on green (c) black on yellow (d) white on dark green
32. 32.🔘 Our rule: buttons are at least 48 px tall. The Next button is 28 px tall. How many px taller must it be?
33. 33.True or false: strong colour contrast is good button design. (a) True (b) False
34. 34.🔘 Is this good or poor button design: buttons almost touching? (a) good design (b) poor design
35. 35.Which colour pair is hard to read? (a) light grey on white (b) black on yellow (c) black on pale grey (d) white on dark green
36. 36.Which colour pair is hard to read? (a) dark blue on white (b) dark blue on black (c) black on yellow (d) black on pale grey
37. 37.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 64 px tall
    Done button: 32 px tall
    Cancel button: 32 px tall
38. 38.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 72 px tall
    Next button: 40 px tall
    Help button: 48 px tall (a) Done (b) Next (c) Help
39. 39.🌗 Is light grey on white easy or hard to read on a button? (a) easy to read (b) hard to read
40. 40.🔘 Our rule: buttons are at least 48 px tall. The Start button is 44 px tall. How many px taller must it be?

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