CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 277 · 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 hex code is white? (a) #ff00ff (b) #000000 (c) #00ff00 (d) #ffffff
2. 2.🌈 In #00004b the blue part is the hex number 4b. What is it as a normal number?
3. 3.🌈 Which colour of light is strongest in rgb(85, 180, 28)? (a) green (b) red (c) blue
4. 4.🌈 Which colour is rgb(0, 255, 0)? (a) bright green (b) yellow (c) blue (d) black
5. 5.🌈 In #003600 the green part is the hex number 36. What is it as a normal number?
6. 6.🌈 Which hex code is red? (a) #0000ff (b) #ffff00 (c) #000000 (d) #ff0000
7. 7.🌈 Which colour is rgb(0, 0, 255)? (a) blue (b) cyan (c) black (d) red
8. 8.🌈 In #rrggbb, which colour do the first two digits give? (a) green (b) black (c) blue (d) red
9. 9.🌈 In #00c100 the green part is the hex number c1. What is it as a normal number?
10. 10.🌈 In #rrggbb, which colour do the last two digits give? (a) white (b) blue (c) green (d) red
11. 11.🌈 Which hex code is bright green? (a) #0000ff (b) #00ff00 (c) #ff00ff (d) #ffff00
12. 12.🌈 Which colour of light is strongest in rgb(126, 127, 255)? (a) red (b) blue (c) green
13. 13.🌈 Which hex code is cyan? (a) #ff0000 (b) #00ff00 (c) #000000 (d) #00ffff
14. 14.🌈 Which colour is #ff0000? (a) yellow (b) red (c) cyan (d) black
15. 15.🌈 Which colour is #0000ff? (a) yellow (b) bright green (c) cyan (d) blue
16. 16.🌈 Which colour is #00ff00? (a) yellow (b) red (c) black (d) bright green
17. 17.🌈 Which colour is rgb(255, 0, 0)? (a) white (b) magenta (c) red (d) bright green
18. 18.🌈 Which colour of light is strongest in rgb(153, 133, 67)? (a) red (b) green (c) blue
19. 19.🌈 Which colour is rgb(255, 255, 0)? (a) magenta (b) yellow (c) blue (d) bright green
20. 20.🌈 Which hex code is yellow? (a) #ffffff (b) #00ffff (c) #ff00ff (d) #ffff00
21. 21.🌈 Which colour is rgb(0, 0, 0)? (a) blue (b) yellow (c) white (d) black
22. 22.🌈 Hex digits go 0 to 9, then A to which letter? (a) F (b) J (c) G (d) Z
23. 23.🌈 Which colour is rgb(255, 0, 255)? (a) yellow (b) cyan (c) magenta (d) black
24. 24.🌈 Which colour is #ffff00? (a) bright green (b) yellow (c) black (d) blue
25. 25.🌈 Which colour of light is strongest in rgb(55, 56, 202)? (a) blue (b) green (c) red
26. 26.🌈 Which colour of light is strongest in rgb(83, 71, 155)? (a) green (b) blue (c) red
27. 27.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 2 (b) 4 (c) 3 (d) 6
28. 28.🌈 Which colour of light is strongest in rgb(85, 234, 8)? (a) green (b) red (c) blue
29. 29.🌈 Which hex code is magenta? (a) #ff0000 (b) #000000 (c) #ff00ff (d) #ffffff
30. 30.🌈 In #000025 the blue part is the hex number 25. What is it as a normal number?
31. 31.🌈 Which colour is #000000? (a) white (b) magenta (c) yellow (d) black
32. 32.🌈 What is the biggest number one colour can have in rgb()? (a) 99 (b) 1000 (c) 255 (d) 100
33. 33.🌈 Which colour of light is strongest in rgb(174, 50, 135)? (a) blue (b) green (c) red
34. 34.🌈 Which colour of light is strongest in rgb(104, 211, 128)? (a) blue (b) green (c) red
35. 35.🌈 Which colour of light is strongest in rgb(3, 26, 242)? (a) blue (b) green (c) red
36. 36.🌈 Which colour is #ffffff? (a) yellow (b) red (c) white (d) bright green
37. 37.🌈 Which colour is #00ffff? (a) black (b) yellow (c) white (d) cyan
38. 38.🌈 Which colour is #ff00ff? (a) magenta (b) blue (c) red (d) cyan
39. 39.🌈 In #ac0000 the red part is the hex number ac. What is it as a normal number?
40. 40.🌈 In #000021 the blue part is the hex number 21. What is it as a normal number?

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