CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 120 · 40 questions

Code tip (Red, green, blue): rgb(red, green, blue): each from 0 to 255. #rrggbb: the same three numbers in hex. Hex digits: 0–9, then a = 10, b = 11, c = 12, d = 13, e = 14, f = 15. A pair = 16 × first digit + second digit: ff = 16 × 15 + 15 = 255.

1. 1.🌈 Which colour is #0000ff? (a) magenta (b) blue (c) red (d) white
2. 2.🌈 In #rrggbb, which colour do the last two digits give? (a) white (b) blue (c) red (d) green
3. 3.🌈 In #rrggbb, which colour do the first two digits give? (a) black (b) red (c) green (d) blue
4. 4.🌈 What is the biggest number one colour can have in rgb()? (a) 255 (b) 100 (c) 99 (d) 1000
5. 5.🌈 Which colour of light is strongest in rgb(69, 188, 104)? (a) red (b) green (c) blue
6. 6.🌈 In #300000 the red part is the hex number 30. What is it as a normal number?
7. 7.🌈 Which hex code is blue? (a) #ffffff (b) #0000ff (c) #ff0000 (d) #ff00ff
8. 8.🌈 Which colour is #ff0000? (a) magenta (b) white (c) red (d) cyan
9. 9.🌈 Which colour is rgb(255, 0, 255)? (a) yellow (b) magenta (c) black (d) blue
10. 10.🌈 In #0b0000 the red part is the hex number 0b. What is it as a normal number?
11. 11.🌈 In #00e600 the green part is the hex number e6. What is it as a normal number?
12. 12.🌈 Which colour is rgb(255, 255, 0)? (a) red (b) yellow (c) white (d) black
13. 13.🌈 Which colour of light is strongest in rgb(136, 233, 63)? (a) red (b) green (c) blue
14. 14.🌈 Which colour of light is strongest in rgb(109, 97, 158)? (a) green (b) blue (c) red
15. 15.🌈 Which colour of light is strongest in rgb(70, 205, 67)? (a) blue (b) red (c) green
16. 16.🌈 Which colour is rgb(0, 0, 255)? (a) white (b) blue (c) red (d) yellow
17. 17.🌈 Which colour is #000000? (a) white (b) magenta (c) cyan (d) black
18. 18.🌈 Which colour of light is strongest in rgb(83, 21, 255)? (a) blue (b) red (c) green
19. 19.🌈 In #000b00 the green part is the hex number 0b. What is it as a normal number?
20. 20.🌈 Which colour is #ff00ff? (a) magenta (b) yellow (c) cyan (d) red
21. 21.🌈 Which colour is #ffff00? (a) black (b) cyan (c) yellow (d) white
22. 22.🌈 Which colour of light is strongest in rgb(99, 20, 239)? (a) green (b) red (c) blue
23. 23.🌈 In #00a300 the green part is the hex number a3. What is it as a normal number?
24. 24.🌈 Which colour is rgb(255, 255, 255)? (a) blue (b) magenta (c) white (d) black
25. 25.🌈 Which colour is #00ff00? (a) cyan (b) bright green (c) red (d) blue
26. 26.🌈 Which colour of light is strongest in rgb(188, 132, 135)? (a) green (b) red (c) blue
27. 27.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 6 (b) 3 (c) 4 (d) 2
28. 28.🌈 Which colour is rgb(0, 255, 0)? (a) bright green (b) red (c) white (d) blue
29. 29.🌈 Which hex code is bright green? (a) #000000 (b) #ff00ff (c) #00ff00 (d) #ffffff
30. 30.🌈 Which hex code is magenta? (a) #ffff00 (b) #ff00ff (c) #ffffff (d) #ff0000
31. 31.🌈 Which colour of light is strongest in rgb(215, 71, 22)? (a) green (b) blue (c) red
32. 32.🌈 In #8e0000 the red part is the hex number 8e. What is it as a normal number?
33. 33.🌈 Which hex code is cyan? (a) #ffffff (b) #ff0000 (c) #00ffff (d) #0000ff
34. 34.🌈 Which hex code is black? (a) #ffffff (b) #000000 (c) #0000ff (d) #00ffff
35. 35.🌈 In #fa0000 the red part is the hex number fa. What is it as a normal number?
36. 36.🌈 In #ce0000 the red part is the hex number ce. What is it as a normal number?
37. 37.🌈 In #004100 the green part is the hex number 41. What is it as a normal number?
38. 38.🌈 In #0000df the blue part is the hex number df. What is it as a normal number?
39. 39.🌈 Which colour of light is strongest in rgb(11, 160, 42)? (a) blue (b) green (c) red
40. 40.🌈 Which colour is rgb(255, 0, 0)? (a) red (b) cyan (c) bright green (d) yellow

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