CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 94 · 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.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 3 (b) 6 (c) 2 (d) 4
2. 2.🌈 In #390000 the red part is the hex number 39. What is it as a normal number?
3. 3.🌈 Which colour is rgb(255, 255, 0)? (a) red (b) blue (c) cyan (d) yellow
4. 4.🌈 Which colour is #ffff00? (a) red (b) yellow (c) white (d) magenta
5. 5.🌈 Which colour of light is strongest in rgb(114, 20, 173)? (a) blue (b) red (c) green
6. 6.🌈 Which hex code is white? (a) #0000ff (b) #00ffff (c) #ffffff (d) #000000
7. 7.🌈 Which colour of light is strongest in rgb(91, 80, 168)? (a) blue (b) green (c) red
8. 8.🌈 Which hex code is red? (a) #0000ff (b) #ff0000 (c) #000000 (d) #ff00ff
9. 9.🌈 Which hex code is blue? (a) #00ffff (b) #000000 (c) #ff00ff (d) #0000ff
10. 10.🌈 In #rrggbb, which colour do the first two digits give? (a) blue (b) black (c) red (d) green
11. 11.🌈 In #00cc00 the green part is the hex number cc. What is it as a normal number?
12. 12.🌈 Which colour of light is strongest in rgb(34, 172, 23)? (a) green (b) blue (c) red
13. 13.🌈 Which colour of light is strongest in rgb(61, 174, 37)? (a) green (b) red (c) blue
14. 14.🌈 Which colour is #ffffff? (a) red (b) magenta (c) bright green (d) white
15. 15.🌈 Which colour is rgb(0, 0, 0)? (a) bright green (b) black (c) red (d) yellow
16. 16.🌈 Which colour is #0000ff? (a) red (b) blue (c) white (d) yellow
17. 17.🌈 Which hex code is black? (a) #000000 (b) #0000ff (c) #00ff00 (d) #ff0000
18. 18.🌈 In #ac0000 the red part is the hex number ac. What is it as a normal number?
19. 19.🌈 Which colour is rgb(0, 255, 255)? (a) black (b) magenta (c) red (d) cyan
20. 20.🌈 Which colour is #ff0000? (a) white (b) red (c) magenta (d) cyan
21. 21.🌈 Which colour is #000000? (a) white (b) red (c) black (d) blue
22. 22.🌈 Which colour is #00ff00? (a) magenta (b) cyan (c) yellow (d) bright green
23. 23.🌈 Which colour is rgb(255, 255, 255)? (a) red (b) white (c) blue (d) black
24. 24.🌈 What is the biggest number one colour can have in rgb()? (a) 99 (b) 255 (c) 1000 (d) 100
25. 25.🌈 In #000055 the blue part is the hex number 55. What is it as a normal number?
26. 26.🌈 Which colour is rgb(255, 0, 255)? (a) bright green (b) cyan (c) yellow (d) magenta
27. 27.🌈 Which colour is #00ffff? (a) black (b) white (c) bright green (d) cyan
28. 28.🌈 Which colour of light is strongest in rgb(27, 5, 160)? (a) blue (b) red (c) green
29. 29.🌈 In #rrggbb, which colour do the last two digits give? (a) white (b) green (c) blue (d) red
30. 30.🌈 Which colour of light is strongest in rgb(80, 27, 227)? (a) green (b) red (c) blue
31. 31.🌈 Which colour of light is strongest in rgb(199, 67, 12)? (a) red (b) green (c) blue
32. 32.🌈 Which colour of light is strongest in rgb(43, 90, 188)? (a) red (b) green (c) blue
33. 33.🌈 Which colour of light is strongest in rgb(39, 9, 226)? (a) blue (b) green (c) red
34. 34.🌈 In #001c00 the green part is the hex number 1c. What is it as a normal number?
35. 35.🌈 Which hex code is magenta? (a) #000000 (b) #00ff00 (c) #ffff00 (d) #ff00ff
36. 36.🌈 In #c30000 the red part is the hex number c3. What is it as a normal number?
37. 37.🌈 In #0000b3 the blue part is the hex number b3. What is it as a normal number?
38. 38.🌈 Which colour of light is strongest in rgb(23, 29, 154)? (a) blue (b) green (c) red
39. 39.🌈 In #000015 the blue part is the hex number 15. What is it as a normal number?
40. 40.🌈 Which colour of light is strongest in rgb(178, 118, 126)? (a) green (b) red (c) blue

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