App Dev Worksheet: Button Size and Contrast

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

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