App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 654 · 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 20 px tall. How many px taller must it be?
2. 2.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 28 px tall. How many px taller must it be?
3. 3.🌗 Is white on black 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 20 px tall. How many px taller must it be?
5. 5.🔘 Is this good or poor button design: a tiny 20 px button? (a) poor design (b) good design
6. 6.Which colour pair is hard to read? (a) black on yellow (b) dark blue on black (c) white on black (d) white on dark green
7. 7.🌗 Is black on yellow easy or hard to read on a button? (a) easy to read (b) hard to read
8. 8.🌗 Is yellow on white easy or hard to read on a button? (a) easy to read (b) hard to read
9. 9.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Help button: 44 px tall
   Save button: 64 px tall
   Cancel button: 52 px tall
   Back button: 40 px tall
10. 10.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 40 px tall. How many px taller must it be?
11. 11.True or false: icons with no meaning is poor button design. (a) True (b) False
12. 12.Which colour pair is easy to read? (a) yellow on white (b) black on yellow (c) red on green (d) light grey on white
13. 13.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Send button: 48 px tall
    Start button: 32 px tall
    Done button: 60 px tall
    Cancel button: 32 px tall
14. 14.True or false: buttons almost touching is poor button design. (a) False (b) True
15. 15.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 40 px tall
    Send button: 32 px tall
    Help button: 64 px tall
    Next button: 64 px tall
16. 16.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 36 px tall
    Done button: 40 px tall
    Back button: 64 px tall
17. 17.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 24 px tall
    Done button: 64 px tall
    Next button: 52 px tall (a) Next (b) Done (c) Save
18. 18.Which colour pair is hard to read? (a) red on green (b) white on black (c) white on dark green (d) black on yellow
19. 19.🌗 Is dark blue on black easy or hard to read on a button? (a) easy to read (b) hard to read
20. 20.Which colour pair is easy to read? (a) white on black (b) yellow on white (c) dark blue on black (d) pale pink on white
21. 21.🔘 Our rule: buttons are at least 48 px tall. The Start button is 44 px tall. How many px taller must it be?
22. 22.True or false: a big, easy tap area is poor button design. (a) False (b) True
23. 23.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 36 px tall
    Send button: 56 px tall
    Back button: 60 px tall (a) Back (b) Send (c) Done
24. 24.True or false: buttons almost touching is good button design. (a) False (b) True
25. 25.True or false: a tiny 20 px button is good button design. (a) True (b) False
26. 26.True or false: strong colour contrast is poor button design. (a) True (b) False
27. 27.🌗 Is pale pink on white easy or hard to read on a button? (a) easy to read (b) hard to read
28. 28.🌗 Is white on dark green easy or hard to read on a button? (a) easy to read (b) hard to read
29. 29.🔘 Is this good or poor button design: icons with no meaning? (a) good design (b) poor design
30. 30.🌗 Is black on pale grey easy or hard to read on a button? (a) easy to read (b) hard to read
31. 31.🌗 Is light grey on white easy or hard to read on a button? (a) easy to read (b) hard to read
32. 32.🔘 Is this good or poor button design: a clear word like Save? (a) good design (b) poor design
33. 33.🔘 Our rule: buttons are at least 48 px tall. The Save button is 36 px tall. How many px taller must it be?
34. 34.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 60 px tall
    Cancel button: 28 px tall
    Next button: 64 px tall (a) Save (b) Cancel (c) Next
35. 35.🔘 Our rule: buttons are at least 48 px tall. The Help button is 20 px tall. How many px taller must it be?
36. 36.Which colour pair is hard to read? (a) yellow on white (b) dark blue on white (c) black on pale grey (d) black on yellow
37. 37.🌗 Is dark blue on white easy or hard to read on a button? (a) hard to read (b) easy to read
38. 38.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 60 px tall
    Send button: 56 px tall
    Start button: 24 px tall (a) Send (b) Start (c) Save
39. 39.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 60 px tall
    Next button: 48 px tall
    Save button: 32 px tall
    Send button: 48 px tall (a) Send (b) Save (c) Next (d) Done
40. 40.🔘 Our rule: buttons are at least 48 px tall. The Save button is 28 px tall. How many px taller must it be?

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