CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 105 · 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 #ffffff? (a) blue (b) black (c) white (d) red
2. 2.🌈 What is the biggest number one colour can have in rgb()? (a) 1000 (b) 100 (c) 255 (d) 99
3. 3.🌈 Which colour is rgb(0, 255, 255)? (a) white (b) blue (c) cyan (d) yellow
4. 4.🌈 Which hex code is red? (a) #ff0000 (b) #ffff00 (c) #00ff00 (d) #000000
5. 5.🌈 Which colour is rgb(255, 255, 255)? (a) black (b) red (c) white (d) cyan
6. 6.🌈 In #000009 the blue part is the hex number 09. What is it as a normal number?
7. 7.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 4 (b) 6 (c) 2 (d) 3
8. 8.🌈 Which colour is #ff00ff? (a) yellow (b) black (c) magenta (d) blue
9. 9.🌈 Hex digits go 0 to 9, then A to which letter? (a) Z (b) F (c) G (d) J
10. 10.🌈 In #000035 the blue part is the hex number 35. What is it as a normal number?
11. 11.🌈 Which colour is rgb(255, 0, 255)? (a) magenta (b) yellow (c) bright green (d) blue
12. 12.🌈 Which colour is #00ffff? (a) black (b) yellow (c) red (d) cyan
13. 13.🌈 In #rrggbb, which colour do the first two digits give? (a) blue (b) black (c) green (d) red
14. 14.🌈 Which hex code is white? (a) #ff0000 (b) #000000 (c) #0000ff (d) #ffffff
15. 15.🌈 In #0000c3 the blue part is the hex number c3. What is it as a normal number?
16. 16.🌈 Which hex code is bright green? (a) #ffffff (b) #00ff00 (c) #0000ff (d) #ffff00
17. 17.🌈 Which colour is #000000? (a) blue (b) white (c) yellow (d) black
18. 18.🌈 Which colour is rgb(255, 0, 0)? (a) white (b) yellow (c) black (d) red
19. 19.🌈 Which hex code is black? (a) #ff0000 (b) #000000 (c) #ffffff (d) #00ffff
20. 20.🌈 In #001800 the green part is the hex number 18. What is it as a normal number?
21. 21.🌈 In #008300 the green part is the hex number 83. What is it as a normal number?
22. 22.🌈 In #e10000 the red part is the hex number e1. What is it as a normal number?
23. 23.🌈 Which hex code is cyan? (a) #0000ff (b) #ffff00 (c) #ffffff (d) #00ffff
24. 24.🌈 Which colour is rgb(0, 0, 255)? (a) magenta (b) blue (c) bright green (d) black
25. 25.🌈 Which hex code is magenta? (a) #0000ff (b) #ffff00 (c) #ff00ff (d) #ffffff
26. 26.🌈 In #00e700 the green part is the hex number e7. What is it as a normal number?
27. 27.🌈 In #000020 the blue part is the hex number 20. What is it as a normal number?
28. 28.🌈 In #000061 the blue part is the hex number 61. What is it as a normal number?
29. 29.🌈 Which colour of light is strongest in rgb(137, 29, 158)? (a) green (b) red (c) blue
30. 30.🌈 Which colour is #00ff00? (a) yellow (b) bright green (c) red (d) magenta
31. 31.🌈 Which colour of light is strongest in rgb(128, 73, 197)? (a) blue (b) green (c) red
32. 32.🌈 Which colour is rgb(255, 255, 0)? (a) cyan (b) blue (c) magenta (d) yellow
33. 33.🌈 Which colour is rgb(0, 0, 0)? (a) black (b) white (c) cyan (d) blue
34. 34.🌈 Which colour is #0000ff? (a) cyan (b) bright green (c) yellow (d) blue
35. 35.🌈 Which colour is #ffff00? (a) red (b) magenta (c) yellow (d) cyan
36. 36.🌈 Which colour is rgb(0, 255, 0)? (a) red (b) blue (c) black (d) bright green
37. 37.🌈 In #rrggbb, which colour do the last two digits give? (a) white (b) green (c) red (d) blue
38. 38.🌈 Which colour of light is strongest in rgb(166, 131, 107)? (a) red (b) green (c) blue
39. 39.🌈 In #002300 the green part is the hex number 23. What is it as a normal number?
40. 40.🌈 Which colour of light is strongest in rgb(91, 249, 23)? (a) blue (b) red (c) green

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