CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 7 · 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.🌈 In #rrggbb, which colour do the first two digits give? (a) black (b) red (c) blue (d) green
2. 2.🌈 In #00a700 the green part is the hex number a7. What is it as a normal number?
3. 3.🌈 Which colour of light is strongest in rgb(25, 190, 47)? (a) green (b) blue (c) red
4. 4.🌈 Which colour is rgb(255, 255, 255)? (a) white (b) red (c) yellow (d) magenta
5. 5.🌈 Which colour of light is strongest in rgb(27, 176, 13)? (a) green (b) blue (c) red
6. 6.🌈 Which colour of light is strongest in rgb(253, 134, 74)? (a) green (b) red (c) blue
7. 7.🌈 Which colour of light is strongest in rgb(64, 71, 204)? (a) blue (b) green (c) red
8. 8.🌈 Which colour is #0000ff? (a) red (b) blue (c) black (d) white
9. 9.🌈 Which colour of light is strongest in rgb(244, 45, 41)? (a) green (b) blue (c) red
10. 10.🌈 In #1d0000 the red part is the hex number 1d. What is it as a normal number?
11. 11.🌈 Which hex code is yellow? (a) #00ff00 (b) #ffff00 (c) #ff0000 (d) #ffffff
12. 12.🌈 Which hex code is cyan? (a) #000000 (b) #00ffff (c) #ffff00 (d) #0000ff
13. 13.🌈 In #d60000 the red part is the hex number d6. What is it as a normal number?
14. 14.🌈 In #00fe00 the green part is the hex number fe. What is it as a normal number?
15. 15.🌈 Which colour is #000000? (a) white (b) black (c) yellow (d) bright green
16. 16.🌈 Which colour of light is strongest in rgb(117, 197, 43)? (a) red (b) blue (c) green
17. 17.🌈 Which hex code is blue? (a) #ffff00 (b) #ffffff (c) #0000ff (d) #00ff00
18. 18.🌈 Which colour of light is strongest in rgb(84, 251, 73)? (a) blue (b) green (c) red
19. 19.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 6 (b) 3 (c) 2 (d) 4
20. 20.🌈 Which colour is #ffffff? (a) bright green (b) red (c) white (d) magenta
21. 21.🌈 Hex digits go 0 to 9, then A to which letter? (a) F (b) G (c) Z (d) J
22. 22.🌈 Which colour of light is strongest in rgb(224, 29, 138)? (a) blue (b) green (c) red
23. 23.🌈 In #005500 the green part is the hex number 55. What is it as a normal number?
24. 24.🌈 Which hex code is red? (a) #00ffff (b) #0000ff (c) #ff0000 (d) #ffffff
25. 25.🌈 Which colour of light is strongest in rgb(241, 61, 86)? (a) blue (b) green (c) red
26. 26.🌈 Which colour is rgb(255, 0, 255)? (a) magenta (b) bright green (c) blue (d) yellow
27. 27.🌈 Which colour is #ff00ff? (a) bright green (b) cyan (c) magenta (d) red
28. 28.🌈 Which colour is rgb(255, 255, 0)? (a) blue (b) red (c) yellow (d) cyan
29. 29.🌈 Which hex code is magenta? (a) #ffffff (b) #0000ff (c) #00ffff (d) #ff00ff
30. 30.🌈 Which hex code is black? (a) #0000ff (b) #ff0000 (c) #000000 (d) #00ff00
31. 31.🌈 In #rrggbb, which colour do the last two digits give? (a) white (b) blue (c) red (d) green
32. 32.🌈 Which colour is rgb(0, 255, 0)? (a) yellow (b) bright green (c) blue (d) cyan
33. 33.🌈 In #210000 the red part is the hex number 21. What is it as a normal number?
34. 34.🌈 Which hex code is bright green? (a) #ffff00 (b) #ff00ff (c) #00ff00 (d) #000000
35. 35.🌈 Which colour is #00ffff? (a) yellow (b) cyan (c) bright green (d) red
36. 36.🌈 In #220000 the red part is the hex number 22. What is it as a normal number?
37. 37.🌈 Which colour of light is strongest in rgb(53, 77, 150)? (a) red (b) green (c) blue
38. 38.🌈 In #00f100 the green part is the hex number f1. What is it as a normal number?
39. 39.🌈 Which colour is #ffff00? (a) red (b) blue (c) black (d) yellow
40. 40.🌈 What is the biggest number one colour can have in rgb()? (a) 255 (b) 99 (c) 100 (d) 1000

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