CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 39 · 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) 4 (b) 3 (c) 2 (d) 6
2. 2.🌈 Which colour is #00ff00? (a) magenta (b) black (c) red (d) bright green
3. 3.🌈 Which colour is rgb(255, 0, 0)? (a) yellow (b) red (c) white (d) bright green
4. 4.🌈 Which colour is rgb(255, 255, 0)? (a) cyan (b) black (c) blue (d) yellow
5. 5.🌈 Which colour is rgb(0, 255, 0)? (a) yellow (b) bright green (c) black (d) magenta
6. 6.🌈 Which colour of light is strongest in rgb(174, 62, 137)? (a) red (b) green (c) blue
7. 7.🌈 Which colour of light is strongest in rgb(12, 176, 7)? (a) green (b) blue (c) red
8. 8.🌈 Which hex code is black? (a) #000000 (b) #ffffff (c) #ffff00 (d) #ff0000
9. 9.🌈 Which colour of light is strongest in rgb(223, 48, 95)? (a) green (b) blue (c) red
10. 10.🌈 Which colour of light is strongest in rgb(252, 24, 28)? (a) red (b) green (c) blue
11. 11.🌈 In #rrggbb, which colour do the last two digits give? (a) white (b) blue (c) red (d) green
12. 12.🌈 Which colour is rgb(255, 0, 255)? (a) red (b) yellow (c) magenta (d) bright green
13. 13.🌈 In #00f300 the green part is the hex number f3. What is it as a normal number?
14. 14.🌈 In #e40000 the red part is the hex number e4. What is it as a normal number?
15. 15.🌈 Which colour is #000000? (a) blue (b) red (c) white (d) black
16. 16.🌈 Which colour of light is strongest in rgb(231, 36, 77)? (a) red (b) blue (c) green
17. 17.🌈 Which colour of light is strongest in rgb(211, 19, 107)? (a) green (b) red (c) blue
18. 18.🌈 Which colour of light is strongest in rgb(239, 97, 75)? (a) blue (b) green (c) red
19. 19.🌈 Which hex code is magenta? (a) #ffffff (b) #ff0000 (c) #00ffff (d) #ff00ff
20. 20.🌈 Which colour is #ff0000? (a) blue (b) white (c) black (d) red
21. 21.🌈 Which colour is rgb(0, 0, 255)? (a) yellow (b) magenta (c) red (d) blue
22. 22.🌈 What is the biggest number one colour can have in rgb()? (a) 100 (b) 255 (c) 99 (d) 1000
23. 23.🌈 In #00ce00 the green part is the hex number ce. What is it as a normal number?
24. 24.🌈 In #0000d2 the blue part is the hex number d2. What is it as a normal number?
25. 25.🌈 Which colour of light is strongest in rgb(58, 124, 220)? (a) blue (b) green (c) red
26. 26.🌈 Which colour of light is strongest in rgb(219, 30, 15)? (a) red (b) blue (c) green
27. 27.🌈 Which colour of light is strongest in rgb(236, 38, 19)? (a) red (b) blue (c) green
28. 28.🌈 Which colour is #ffff00? (a) bright green (b) red (c) yellow (d) cyan
29. 29.🌈 In #002a00 the green part is the hex number 2a. What is it as a normal number?
30. 30.🌈 Which colour is #0000ff? (a) black (b) magenta (c) blue (d) cyan
31. 31.🌈 Which colour of light is strongest in rgb(74, 109, 153)? (a) red (b) blue (c) green
32. 32.🌈 Which colour is #ff00ff? (a) blue (b) magenta (c) red (d) bright green
33. 33.🌈 In #0000ad the blue part is the hex number ad. What is it as a normal number?
34. 34.🌈 Which colour is rgb(255, 255, 255)? (a) red (b) magenta (c) blue (d) white
35. 35.🌈 Hex digits go 0 to 9, then A to which letter? (a) J (b) Z (c) G (d) F
36. 36.🌈 Which colour of light is strongest in rgb(165, 21, 31)? (a) red (b) green (c) blue
37. 37.🌈 Which colour of light is strongest in rgb(16, 152, 110)? (a) green (b) red (c) blue
38. 38.🌈 Which hex code is white? (a) #00ff00 (b) #ff00ff (c) #000000 (d) #ffffff
39. 39.🌈 Which hex code is cyan? (a) #ff00ff (b) #ffff00 (c) #ffffff (d) #00ffff
40. 40.🌈 In #220000 the red part is the hex number 22. What is it as a normal number?

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