App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 461 · 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.🌗 Is dark blue on white easy or hard to read on a button? (a) easy to read (b) hard to read
2. 2.🔘 Our rule: buttons are at least 48 px tall. The Save button is 24 px tall. How many px taller must it be?
3. 3.Which colour pair is hard to read? (a) black on yellow (b) pale pink on white (c) white on dark green (d) white on black
4. 4.🔘 Is this good or poor button design: a tiny 20 px button? (a) good design (b) poor design
5. 5.Which colour pair is easy to read? (a) black on yellow (b) red on green (c) dark blue on black (d) light grey on white
6. 6.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 28 px tall. How many px taller must it be?
7. 7.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Help button: 36 px tall
   Cancel button: 56 px tall
   Done button: 56 px tall (a) Help (b) Done (c) Cancel
8. 8.🔘 Our rule: buttons are at least 48 px tall. The Done button is 36 px tall. How many px taller must it be?
9. 9.🔘 Our rule: buttons are at least 48 px tall. The Next button is 24 px tall. How many px taller must it be?
10. 10.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 60 px tall
    Start button: 36 px tall
    Send button: 40 px tall
11. 11.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 56 px tall
    Save button: 36 px tall
    Cancel button: 64 px tall
    Start button: 72 px tall (a) Send (b) Start (c) Cancel (d) Save
12. 12.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 60 px tall
    Help button: 48 px tall
    Next button: 44 px tall (a) Next (b) Back (c) Help
13. 13.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 56 px tall
    Cancel button: 52 px tall
    Start button: 56 px tall
    Done button: 24 px tall (a) Start (b) Cancel (c) Done (d) Next
14. 14.🌗 Is white on black easy or hard to read on a button? (a) hard to read (b) easy to read
15. 15.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 44 px tall
    Start button: 64 px tall
    Save button: 64 px tall
    Send button: 36 px tall
16. 16.🔘 Our rule: buttons are at least 48 px tall. The Send button is 24 px tall. How many px taller must it be?
17. 17.🌗 Is dark blue on black easy or hard to read on a button? (a) hard to read (b) easy to read
18. 18.🌗 Is light grey on white easy or hard to read on a button? (a) easy to read (b) hard to read
19. 19.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 36 px tall
    Start button: 52 px tall
    Send button: 52 px tall (a) Back (b) Send (c) Start
20. 20.True or false: a tiny 20 px button is poor button design. (a) True (b) False
21. 21.True or false: a clear word like Save is poor button design. (a) True (b) False
22. 22.Which colour pair is hard to read? (a) red on green (b) dark blue on white (c) white on dark green (d) black on pale grey
23. 23.Which colour pair is easy to read? (a) light grey on white (b) white on dark green (c) yellow on white (d) dark blue on black
24. 24.True or false: a big, easy tap area is good button design. (a) False (b) True
25. 25.True or false: grey text on grey is good button design. (a) True (b) False
26. 26.🌗 Is yellow on white easy or hard to read on a button? (a) hard to read (b) easy to read
27. 27.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 60 px tall
    Send button: 52 px tall
    Help button: 28 px tall (a) Help (b) Send (c) Cancel
28. 28.True or false: strong colour contrast is poor button design. (a) True (b) False
29. 29.🔘 Our rule: buttons are at least 48 px tall. The Help button is 44 px tall. How many px taller must it be?
30. 30.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 32 px tall
    Send button: 56 px tall
    Back button: 60 px tall
31. 31.Which colour pair is hard to read? (a) light grey on white (b) white on black (c) black on pale grey (d) black on yellow
32. 32.Which colour pair is easy to read? (a) dark blue on black (b) yellow on white (c) white on black (d) red on green
33. 33.🔘 Our rule: buttons are at least 48 px tall. The Send button is 20 px tall. How many px taller must it be?
34. 34.🔘 Is this good or poor button design: buttons almost touching? (a) good design (b) poor design
35. 35.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 60 px tall
    Help button: 32 px tall
    Cancel button: 72 px tall (a) Cancel (b) Help (c) Done
36. 36.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 52 px tall
    Cancel button: 64 px tall
    Save button: 24 px tall
    Next button: 52 px tall (a) Done (b) Next (c) Cancel (d) Save
37. 37.Which colour pair is hard to read? (a) black on pale grey (b) black on yellow (c) yellow on white (d) dark blue on white
38. 38.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 60 px tall
    Next button: 60 px tall
    Save button: 64 px tall
39. 39.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 56 px tall
    Save button: 60 px tall
    Start button: 24 px tall (a) Save (b) Start (c) Back
40. 40.🔘 Our rule: buttons are at least 48 px tall. The Done button is 44 px tall. How many px taller must it be?

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