CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 337 · 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) red (b) blue (c) green (d) black
2. 2.🌈 Which colour is #00ffff? (a) red (b) bright green (c) blue (d) cyan
3. 3.🌈 Which colour is #00ff00? (a) cyan (b) red (c) bright green (d) yellow
4. 4.🌈 Which colour is #ffffff? (a) red (b) magenta (c) yellow (d) white
5. 5.🌈 Which colour of light is strongest in rgb(150, 71, 46)? (a) red (b) green (c) blue
6. 6.🌈 Which colour is #ff0000? (a) cyan (b) red (c) white (d) bright green
7. 7.🌈 Which colour is rgb(255, 255, 255)? (a) cyan (b) red (c) white (d) magenta
8. 8.🌈 Which colour is #000000? (a) black (b) red (c) magenta (d) white
9. 9.🌈 What is the biggest number one colour can have in rgb()? (a) 1000 (b) 99 (c) 255 (d) 100
10. 10.🌈 Hex digits go 0 to 9, then A to which letter? (a) Z (b) F (c) G (d) J
11. 11.🌈 In #rrggbb, which colour do the last two digits give? (a) green (b) white (c) red (d) blue
12. 12.🌈 Which colour is rgb(0, 255, 0)? (a) cyan (b) blue (c) black (d) bright green
13. 13.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 6 (b) 3 (c) 4 (d) 2
14. 14.🌈 Which colour is rgb(255, 255, 0)? (a) bright green (b) yellow (c) white (d) red
15. 15.🌈 Which colour is rgb(255, 0, 0)? (a) magenta (b) bright green (c) red (d) blue
16. 16.🌈 In #0000a2 the blue part is the hex number a2. What is it as a normal number?
17. 17.🌈 Which colour is #ffff00? (a) bright green (b) yellow (c) cyan (d) red
18. 18.🌈 In #002300 the green part is the hex number 23. What is it as a normal number?
19. 19.🌈 In #000013 the blue part is the hex number 13. What is it as a normal number?
20. 20.🌈 Which colour of light is strongest in rgb(114, 165, 133)? (a) blue (b) red (c) green
21. 21.🌈 Which colour is #ff00ff? (a) black (b) blue (c) magenta (d) cyan
22. 22.🌈 Which hex code is yellow? (a) #ffffff (b) #000000 (c) #ffff00 (d) #00ffff
23. 23.🌈 Which hex code is red? (a) #00ffff (b) #00ff00 (c) #ff0000 (d) #0000ff
24. 24.🌈 Which colour of light is strongest in rgb(233, 20, 74)? (a) green (b) red (c) blue
25. 25.🌈 Which colour of light is strongest in rgb(165, 83, 41)? (a) blue (b) red (c) green
26. 26.🌈 Which colour of light is strongest in rgb(217, 26, 137)? (a) green (b) blue (c) red
27. 27.🌈 Which colour is rgb(0, 0, 0)? (a) magenta (b) black (c) yellow (d) red
28. 28.🌈 In #003800 the green part is the hex number 38. What is it as a normal number?
29. 29.🌈 In #cc0000 the red part is the hex number cc. What is it as a normal number?
30. 30.🌈 Which colour is #0000ff? (a) bright green (b) red (c) black (d) blue
31. 31.🌈 Which colour of light is strongest in rgb(212, 84, 136)? (a) red (b) green (c) blue
32. 32.🌈 Which hex code is bright green? (a) #ffffff (b) #00ff00 (c) #000000 (d) #ff00ff
33. 33.🌈 Which hex code is cyan? (a) #ffff00 (b) #ff00ff (c) #00ff00 (d) #00ffff
34. 34.🌈 In #0000d0 the blue part is the hex number d0. What is it as a normal number?
35. 35.🌈 In #2d0000 the red part is the hex number 2d. What is it as a normal number?
36. 36.🌈 In #260000 the red part is the hex number 26. What is it as a normal number?
37. 37.🌈 In #0000d9 the blue part is the hex number d9. What is it as a normal number?
38. 38.🌈 Which hex code is blue? (a) #0000ff (b) #ffffff (c) #ff0000 (d) #00ff00
39. 39.🌈 In #00001d the blue part is the hex number 1d. What is it as a normal number?
40. 40.🌈 In #0000b2 the blue part is the hex number b2. What is it as a normal number?

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