CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 173 · 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) 2 (c) 3 (d) 6
2. 2.🌈 Which colour is #00ff00? (a) magenta (b) bright green (c) yellow (d) blue
3. 3.🌈 Which colour of light is strongest in rgb(61, 98, 172)? (a) green (b) blue (c) red
4. 4.🌈 Which hex code is magenta? (a) #0000ff (b) #ffffff (c) #ffff00 (d) #ff00ff
5. 5.🌈 Which colour is rgb(255, 255, 0)? (a) magenta (b) yellow (c) black (d) red
6. 6.🌈 Which colour of light is strongest in rgb(106, 82, 156)? (a) green (b) red (c) blue
7. 7.🌈 In #00001e the blue part is the hex number 1e. What is it as a normal number?
8. 8.🌈 In #290000 the red part is the hex number 29. What is it as a normal number?
9. 9.🌈 Which hex code is white? (a) #00ffff (b) #ff00ff (c) #ffffff (d) #00ff00
10. 10.🌈 In #rrggbb, which colour do the last two digits give? (a) green (b) red (c) white (d) blue
11. 11.🌈 Which hex code is red? (a) #ff0000 (b) #ff00ff (c) #0000ff (d) #00ff00
12. 12.🌈 What is the biggest number one colour can have in rgb()? (a) 100 (b) 99 (c) 255 (d) 1000
13. 13.🌈 In #0c0000 the red part is the hex number 0c. What is it as a normal number?
14. 14.🌈 Which colour is #ff00ff? (a) magenta (b) yellow (c) black (d) white
15. 15.🌈 Which colour is #0000ff? (a) white (b) yellow (c) cyan (d) blue
16. 16.🌈 In #0000c0 the blue part is the hex number c0. What is it as a normal number?
17. 17.🌈 In #240000 the red part is the hex number 24. What is it as a normal number?
18. 18.🌈 Which colour is #ff0000? (a) red (b) yellow (c) bright green (d) white
19. 19.🌈 Which colour is #ffffff? (a) bright green (b) red (c) white (d) black
20. 20.🌈 Which colour is rgb(0, 255, 0)? (a) bright green (b) black (c) red (d) blue
21. 21.🌈 In #00002d the blue part is the hex number 2d. What is it as a normal number?
22. 22.🌈 In #rrggbb, which colour do the first two digits give? (a) red (b) black (c) blue (d) green
23. 23.🌈 Which colour of light is strongest in rgb(223, 85, 25)? (a) green (b) red (c) blue
24. 24.🌈 In #003700 the green part is the hex number 37. What is it as a normal number?
25. 25.🌈 Which colour is #00ffff? (a) cyan (b) white (c) magenta (d) red
26. 26.🌈 Which colour is #ffff00? (a) white (b) magenta (c) yellow (d) black
27. 27.🌈 Which colour is rgb(0, 255, 255)? (a) yellow (b) cyan (c) bright green (d) black
28. 28.🌈 In #660000 the red part is the hex number 66. What is it as a normal number?
29. 29.🌈 Which colour is rgb(255, 0, 0)? (a) blue (b) red (c) white (d) black
30. 30.🌈 Which colour of light is strongest in rgb(174, 71, 35)? (a) green (b) red (c) blue
31. 31.🌈 In #f40000 the red part is the hex number f4. What is it as a normal number?
32. 32.🌈 In #003000 the green part is the hex number 30. What is it as a normal number?
33. 33.🌈 Which hex code is black? (a) #ff00ff (b) #00ffff (c) #0000ff (d) #000000
34. 34.🌈 Which colour of light is strongest in rgb(191, 67, 18)? (a) blue (b) green (c) red
35. 35.🌈 Which colour of light is strongest in rgb(50, 179, 121)? (a) blue (b) red (c) green
36. 36.🌈 Which colour of light is strongest in rgb(180, 81, 12)? (a) green (b) blue (c) red
37. 37.🌈 Which hex code is yellow? (a) #0000ff (b) #ff00ff (c) #ffff00 (d) #ff0000
38. 38.🌈 Which colour is rgb(0, 0, 0)? (a) yellow (b) red (c) cyan (d) black
39. 39.🌈 In #be0000 the red part is the hex number be. What is it as a normal number?
40. 40.🌈 Which colour is rgb(255, 255, 255)? (a) cyan (b) magenta (c) black (d) white

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