App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 287 · 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. Which button is too small?
   Back button: 72 px tall
   Start button: 52 px tall
   Next button: 36 px tall (a) Start (b) Back (c) Next
2. 2.🌗 Is dark blue on black easy or hard to read on a button? (a) easy to read (b) hard to read
3. 3.🔘 Is this good or poor button design: a big, easy tap area? (a) good design (b) poor design
4. 4.Which colour pair is easy to read? (a) white on dark green (b) pale pink on white (c) red on green (d) light grey on white
5. 5.Which colour pair is easy to read? (a) dark blue on white (b) dark blue on black (c) yellow on white (d) pale pink on white
6. 6.🌗 Is white on black easy or hard to read on a button? (a) hard to read (b) easy to read
7. 7.Which colour pair is easy to read? (a) black on pale grey (b) yellow on white (c) dark blue on black (d) light grey on white
8. 8.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Back button: 32 px tall
   Send button: 32 px tall
   Start button: 32 px tall
   Save button: 32 px tall
9. 9.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Cancel button: 44 px tall
   Save button: 68 px tall
   Send button: 52 px tall (a) Send (b) Save (c) Cancel
10. 10.🌗 Is yellow on white easy or hard to read on a button? (a) easy to read (b) hard to read
11. 11.🔘 Is this good or poor button design: buttons almost touching? (a) good design (b) poor design
12. 12.🔘 Is this good or poor button design: a tiny 20 px button? (a) poor design (b) good design
13. 13.Which colour pair is easy to read? (a) pale pink on white (b) light grey on white (c) red on green (d) white on black
14. 14.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Send button: 44 px tall
    Start button: 52 px tall
    Help button: 44 px tall
15. 15.🔘 Is this good or poor button design: strong colour contrast? (a) good design (b) poor design
16. 16.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 56 px tall
    Next button: 44 px tall
    Help button: 64 px tall
17. 17.🌗 Is pale pink on white easy or hard to read on a button? (a) hard to read (b) easy to read
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) white on dark green (b) black on pale grey (c) light grey on white (d) black on yellow
20. 20.🔘 Our rule: buttons are at least 48 px tall. The Send button is 32 px tall. How many px taller must it be?
21. 21.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 52 px tall
    Help button: 40 px tall
    Start button: 64 px tall (a) Save (b) Start (c) Help
22. 22.Which colour pair is hard to read? (a) black on yellow (b) red on green (c) white on black (d) white on dark green
23. 23.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 68 px tall
    Start button: 36 px tall
    Help button: 60 px tall
    Back button: 64 px tall (a) Start (b) Send (c) Back (d) Help
24. 24.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 36 px tall
    Cancel button: 48 px tall
    Done button: 48 px tall
25. 25.🔘 Our rule: buttons are at least 48 px tall. The Start button is 40 px tall. How many px taller must it be?
26. 26.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 44 px tall
    Help button: 48 px tall
    Back button: 52 px tall (a) Back (b) Help (c) Done
27. 27.🌗 Is red on green easy or hard to read on a button? (a) easy to read (b) hard to read
28. 28.🔘 Our rule: buttons are at least 48 px tall. The Next button is 32 px tall. How many px taller must it be?
29. 29.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 64 px tall
    Next button: 56 px tall
    Save button: 24 px tall (a) Next (b) Save (c) Back
30. 30.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 28 px tall
    Help button: 56 px tall
    Send button: 64 px tall (a) Next (b) Help (c) Send
31. 31.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 60 px tall
    Back button: 60 px tall
    Help button: 36 px tall
    Next button: 72 px tall (a) Cancel (b) Back (c) Next (d) Help
32. 32.🔘 Our rule: buttons are at least 48 px tall. The Start button is 36 px tall. How many px taller must it be?
33. 33.Which colour pair is hard to read? (a) dark blue on white (b) black on yellow (c) dark blue on black (d) black on pale grey
34. 34.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 68 px tall
    Back button: 32 px tall
    Send button: 72 px tall (a) Send (b) Start (c) Back
35. 35.🌗 Is white on dark green easy or hard to read on a button? (a) hard to read (b) easy to read
36. 36.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 44 px tall. How many px taller must it be?
37. 37.🔘 Our rule: buttons are at least 48 px tall. The Save button is 36 px tall. How many px taller must it be?
38. 38.🔘 Our rule: buttons are at least 48 px tall. The Send button is 20 px tall. How many px taller must it be?
39. 39.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 56 px tall
    Save button: 60 px tall
    Next button: 40 px tall
    Back button: 68 px tall (a) Save (b) Start (c) Next (d) Back
40. 40.🌗 Is black on pale grey easy or hard to read on a button? (a) hard to read (b) easy to read

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