CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 287 · 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 rgb(255, 255, 0)? (a) black (b) bright green (c) yellow (d) magenta
2. 2.🌈 In #002800 the green part is the hex number 28. What is it as a normal number?
3. 3.🌈 What is the biggest number one colour can have in rgb()? (a) 99 (b) 100 (c) 255 (d) 1000
4. 4.🌈 In #rrggbb, which colour do the first two digits give? (a) black (b) red (c) green (d) blue
5. 5.🌈 Which colour is #00ffff? (a) bright green (b) blue (c) magenta (d) cyan
6. 6.🌈 Which colour is rgb(255, 0, 0)? (a) yellow (b) red (c) black (d) cyan
7. 7.🌈 Which colour of light is strongest in rgb(172, 64, 140)? (a) green (b) red (c) blue
8. 8.🌈 Which hex code is black? (a) #ffffff (b) #00ff00 (c) #000000 (d) #ff00ff
9. 9.🌈 Which colour is rgb(255, 255, 255)? (a) magenta (b) yellow (c) cyan (d) white
10. 10.🌈 Which colour is rgb(255, 0, 255)? (a) white (b) bright green (c) magenta (d) black
11. 11.🌈 Hex digits go 0 to 9, then A to which letter? (a) G (b) Z (c) J (d) F
12. 12.🌈 Which colour is #00ff00? (a) cyan (b) red (c) bright green (d) white
13. 13.🌈 Which hex code is white? (a) #ff0000 (b) #ffffff (c) #000000 (d) #ff00ff
14. 14.🌈 Which colour of light is strongest in rgb(19, 215, 3)? (a) blue (b) red (c) green
15. 15.🌈 In #000500 the green part is the hex number 05. What is it as a normal number?
16. 16.🌈 In #rrggbb, which colour do the last two digits give? (a) blue (b) red (c) green (d) white
17. 17.🌈 Which colour is #ff0000? (a) blue (b) white (c) yellow (d) red
18. 18.🌈 In #00004b the blue part is the hex number 4b. What is it as a normal number?
19. 19.🌈 Which colour of light is strongest in rgb(129, 220, 124)? (a) red (b) blue (c) green
20. 20.🌈 Which colour of light is strongest in rgb(18, 175, 88)? (a) red (b) green (c) blue
21. 21.🌈 Which colour is #ffffff? (a) blue (b) cyan (c) white (d) red
22. 22.🌈 Which hex code is cyan? (a) #00ffff (b) #ff00ff (c) #ffffff (d) #000000
23. 23.🌈 Which colour of light is strongest in rgb(93, 223, 98)? (a) blue (b) green (c) red
24. 24.🌈 Which hex code is yellow? (a) #ffff00 (b) #00ffff (c) #0000ff (d) #ffffff
25. 25.🌈 In #005700 the green part is the hex number 57. What is it as a normal number?
26. 26.🌈 Which hex code is red? (a) #ff00ff (b) #ffffff (c) #0000ff (d) #ff0000
27. 27.🌈 Which colour of light is strongest in rgb(75, 61, 172)? (a) green (b) red (c) blue
28. 28.🌈 Which colour of light is strongest in rgb(71, 70, 150)? (a) green (b) red (c) blue
29. 29.🌈 In #00d300 the green part is the hex number d3. What is it as a normal number?
30. 30.🌈 Which colour of light is strongest in rgb(136, 15, 167)? (a) red (b) green (c) blue
31. 31.🌈 In #00001b the blue part is the hex number 1b. What is it as a normal number?
32. 32.🌈 Which colour of light is strongest in rgb(33, 163, 78)? (a) green (b) red (c) blue
33. 33.🌈 Which colour of light is strongest in rgb(155, 3, 114)? (a) green (b) red (c) blue
34. 34.🌈 Which colour of light is strongest in rgb(185, 35, 88)? (a) green (b) red (c) blue
35. 35.🌈 In #000022 the blue part is the hex number 22. What is it as a normal number?
36. 36.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 2 (b) 6 (c) 3 (d) 4
37. 37.🌈 Which colour of light is strongest in rgb(221, 11, 93)? (a) blue (b) green (c) red
38. 38.🌈 Which colour is #000000? (a) bright green (b) black (c) cyan (d) magenta
39. 39.🌈 Which colour of light is strongest in rgb(205, 72, 107)? (a) blue (b) red (c) green
40. 40.🌈 Which colour of light is strongest in rgb(251, 104, 35)? (a) red (b) blue (c) green

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