App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 360 · 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 Start button is 32 px tall. How many px taller must it be?
2. 2.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Send button: 56 px tall
   Start button: 60 px tall
   Save button: 28 px tall (a) Start (b) Send (c) Save
3. 3.🔘 Is this good or poor button design: buttons almost touching? (a) poor design (b) good design
4. 4.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 40 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?
   Start button: 36 px tall
   Save button: 64 px tall
   Next button: 36 px tall
   Cancel button: 48 px tall
6. 6.🌗 Is light grey on white easy or hard to read on a button? (a) easy to read (b) hard to read
7. 7.🔘 Is this good or poor button design: a clear word like Save? (a) good design (b) poor design
8. 8.🔘 Our rule: buttons are at least 48 px tall. The Back button is 32 px tall. How many px taller must it be?
9. 9.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Cancel button: 48 px tall
   Back button: 36 px tall
   Help button: 36 px tall
10. 10.🔘 Our rule: buttons are at least 48 px tall. The Next button is 28 px tall. How many px taller must it be?
11. 11.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 32 px tall. How many px taller must it be?
12. 12.Which colour pair is hard to read? (a) yellow on white (b) black on yellow (c) white on dark green (d) dark blue on white
13. 13.🌗 Is yellow on white easy or hard to read on a button? (a) hard to read (b) easy to read
14. 14.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 32 px tall
    Next button: 52 px tall
    Start button: 32 px tall
    Send button: 60 px tall
15. 15.🔘 Is this good or poor button design: space between buttons? (a) good design (b) poor design
16. 16.🌗 Is white on dark green easy or hard to read on a button? (a) easy to read (b) hard to read
17. 17.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 44 px tall
    Send button: 60 px tall
    Back button: 64 px tall
18. 18.🔘 Is this good or poor button design: icons with no meaning? (a) good design (b) poor design
19. 19.Which colour pair is hard to read? (a) pale pink on white (b) dark blue on white (c) black on yellow (d) black on pale grey
20. 20.🌗 Is black on pale grey easy or hard to read on a button? (a) hard to read (b) easy to read
21. 21.🌗 Is pale pink on white easy or hard to read on a button? (a) easy to read (b) hard to read
22. 22.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 68 px tall
    Done button: 28 px tall
    Send button: 68 px tall (a) Send (b) Done (c) Back
23. 23.🔘 Our rule: buttons are at least 48 px tall. The Send button is 40 px tall. How many px taller must it be?
24. 24.🔘 Our rule: buttons are at least 48 px tall. The Done button is 24 px tall. How many px taller must it be?
25. 25.🌗 Is white on black easy or hard to read on a button? (a) hard to read (b) easy to read
26. 26.🔘 Is this good or poor button design: strong colour contrast? (a) poor design (b) good design
27. 27.Which colour pair is hard to read? (a) black on yellow (b) white on dark green (c) dark blue on black (d) black on pale grey
28. 28.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 48 px tall
    Cancel button: 36 px tall
    Done button: 40 px tall
    Send button: 40 px tall
29. 29.True or false: strong colour contrast is good button design. (a) True (b) False
30. 30.🔘 Our rule: buttons are at least 48 px tall. The Help button is 32 px tall. How many px taller must it be?
31. 31.🔘 Our rule: buttons are at least 48 px tall. The Back button is 20 px tall. How many px taller must it be?
32. 32.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 52 px tall
    Cancel button: 40 px tall
    Back button: 56 px tall
    Help button: 52 px tall (a) Back (b) Send (c) Help (d) Cancel
33. 33.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 32 px tall
    Send button: 72 px tall
    Start button: 60 px tall (a) Send (b) Start (c) Next
34. 34.Which colour pair is easy to read? (a) pale pink on white (b) light grey on white (c) dark blue on white (d) dark blue on black
35. 35.True or false: grey text on grey is poor button design. (a) True (b) False
36. 36.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 40 px tall
    Start button: 48 px tall
    Back button: 52 px tall (a) Back (b) Start (c) Next
37. 37.True or false: a clear word like Save is good button design. (a) False (b) True
38. 38.Which colour pair is easy to read? (a) light grey on white (b) white on dark green (c) dark blue on black (d) pale pink on white
39. 39.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 36 px tall
    Back button: 56 px tall
    Start button: 52 px tall
    Done button: 60 px tall (a) Back (b) Next (c) Start (d) Done
40. 40.🔘 Is this good or poor button design: a big, easy tap area? (a) poor design (b) good design

Free app development lessons, practice and worksheets at talentjr.in/app-development-for-students