App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 247 · 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 Save button is 28 px tall. How many px taller must it be?
2. 2.True or false: space between buttons is poor button design. (a) False (b) True
3. 3.🌗 Is black on pale grey easy or hard to read on a button? (a) easy to read (b) hard to read
4. 4.True or false: a big, easy tap area is good button design. (a) False (b) True
5. 5.Which colour pair is hard to read? (a) white on black (b) white on dark green (c) dark blue on white (d) dark blue on black
6. 6.🔘 Is this good or poor button design: icons with no meaning? (a) poor design (b) good design
7. 7.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Start button: 32 px tall
   Help button: 40 px tall
   Done button: 36 px tall
8. 8.🌗 Is light grey on white easy or hard to read on a button? (a) hard to read (b) easy to read
9. 9.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Cancel button: 52 px tall
   Back button: 48 px tall
   Send button: 68 px tall
   Start button: 44 px tall (a) Cancel (b) Send (c) Start (d) Back
10. 10.🔘 Our rule: buttons are at least 48 px tall. The Next button is 24 px tall. How many px taller must it be?
11. 11.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 44 px tall
    Help button: 60 px tall
    Next button: 72 px tall
    Save button: 68 px tall (a) Save (b) Help (c) Cancel (d) Next
12. 12.🌗 Is white on dark green easy or hard to read on a button? (a) hard to read (b) easy to read
13. 13.Which colour pair is easy to read? (a) black on yellow (b) light grey on white (c) red on green (d) yellow on white
14. 14.🔘 Is this good or poor button design: buttons almost touching? (a) good design (b) poor design
15. 15.🔘 Our rule: buttons are at least 48 px tall. The Next button is 36 px tall. How many px taller must it be?
16. 16.True or false: a clear word like Save is poor button design. (a) True (b) False
17. 17.🌗 Is red on green 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 Cancel button is 24 px tall. How many px taller must it be?
19. 19.Which colour pair is hard to read? (a) black on yellow (b) dark blue on white (c) black on pale grey (d) light grey on white
20. 20.🔘 Our rule: buttons are at least 48 px tall. The Save button is 20 px tall. How many px taller must it be?
21. 21.🔘 Is this good or poor button design: strong colour contrast? (a) poor design (b) good design
22. 22.🔘 Is this good or poor button design: a big, easy tap area? (a) good design (b) poor design
23. 23.Which colour pair is easy to read? (a) light grey on white (b) black on pale grey (c) yellow on white (d) dark blue on black
24. 24.🔘 Is this good or poor button design: a tiny 20 px button? (a) good design (b) poor design
25. 25.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 48 px tall
    Back button: 52 px tall
    Send button: 36 px tall
26. 26.🔘 Our rule: buttons are at least 48 px tall. The Start button is 40 px tall. How many px taller must it be?
27. 27.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Send button: 56 px tall
    Start button: 52 px tall
    Help button: 52 px tall
    Save button: 40 px tall
28. 28.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 48 px tall
    Start button: 64 px tall
    Send button: 40 px tall
    Next button: 52 px tall (a) Cancel (b) Send (c) Next (d) Start
29. 29.Which colour pair is hard to read? (a) black on pale grey (b) red on green (c) white on dark green (d) black on yellow
30. 30.True or false: strong colour contrast is good button design. (a) False (b) True
31. 31.True or false: icons with no meaning is good button design. (a) False (b) True
32. 32.Which colour pair is hard to read? (a) pale pink on white (b) white on dark green (c) white on black (d) black on yellow
33. 33.True or false: grey text on grey is poor button design. (a) False (b) True
34. 34.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 44 px tall
    Help button: 56 px tall
    Start button: 60 px tall
    Cancel button: 68 px tall (a) Help (b) Back (c) Cancel (d) Start
35. 35.True or false: a tiny 20 px button is poor button design. (a) True (b) False
36. 36.🔘 Our rule: buttons are at least 48 px tall. The Start button is 20 px tall. How many px taller must it be?
37. 37.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 28 px tall
    Cancel button: 52 px tall
    Next button: 48 px tall (a) Cancel (b) Next (c) Save
38. 38.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 64 px tall
    Help button: 28 px tall
    Next button: 52 px tall
    Send button: 56 px tall (a) Next (b) Help (c) Cancel (d) Send
39. 39.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 40 px tall
    Send button: 48 px tall
    Back button: 44 px tall
40. 40.🔘 Our rule: buttons are at least 48 px tall. The Next button is 32 px tall. How many px taller must it be?

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