CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 175 · 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.🌈 Which colour is rgb(255, 255, 255)? (a) white (b) yellow (c) magenta (d) blue
2. 2.🌈 Which hex code is black? (a) #ffff00 (b) #ff0000 (c) #00ffff (d) #000000
3. 3.🌈 In #rrggbb, which colour do the last two digits give? (a) red (b) green (c) white (d) blue
4. 4.🌈 In #000077 the blue part is the hex number 77. What is it as a normal number?
5. 5.🌈 In #003000 the green part is the hex number 30. What is it as a normal number?
6. 6.🌈 Which colour of light is strongest in rgb(119, 222, 1)? (a) blue (b) green (c) red
7. 7.🌈 In #rrggbb, which colour do the first two digits give? (a) blue (b) red (c) black (d) green
8. 8.🌈 Which colour is rgb(0, 255, 255)? (a) cyan (b) blue (c) magenta (d) bright green
9. 9.🌈 Which hex code is red? (a) #000000 (b) #ff0000 (c) #ff00ff (d) #0000ff
10. 10.🌈 In #f10000 the red part is the hex number f1. What is it as a normal number?
11. 11.🌈 What is the biggest number one colour can have in rgb()? (a) 100 (b) 1000 (c) 255 (d) 99
12. 12.🌈 Which colour of light is strongest in rgb(7, 39, 244)? (a) red (b) green (c) blue
13. 13.🌈 Which hex code is white? (a) #000000 (b) #00ff00 (c) #ffffff (d) #ffff00
14. 14.🌈 In #0e0000 the red part is the hex number 0e. What is it as a normal number?
15. 15.🌈 Which colour is #0000ff? (a) blue (b) magenta (c) cyan (d) yellow
16. 16.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 4 (b) 2 (c) 3 (d) 6
17. 17.🌈 Which colour of light is strongest in rgb(25, 56, 169)? (a) green (b) red (c) blue
18. 18.🌈 Which hex code is cyan? (a) #00ff00 (b) #00ffff (c) #ff0000 (d) #ff00ff
19. 19.🌈 Which colour of light is strongest in rgb(115, 168, 6)? (a) red (b) green (c) blue
20. 20.🌈 Hex digits go 0 to 9, then A to which letter? (a) F (b) Z (c) G (d) J
21. 21.🌈 In #f20000 the red part is the hex number f2. What is it as a normal number?
22. 22.🌈 Which colour is rgb(0, 0, 255)? (a) blue (b) black (c) red (d) cyan
23. 23.🌈 Which hex code is bright green? (a) #000000 (b) #ffff00 (c) #ffffff (d) #00ff00
24. 24.🌈 In #004e00 the green part is the hex number 4e. What is it as a normal number?
25. 25.🌈 In #0000a1 the blue part is the hex number a1. What is it as a normal number?
26. 26.🌈 In #003300 the green part is the hex number 33. What is it as a normal number?
27. 27.🌈 Which colour is rgb(255, 255, 0)? (a) cyan (b) red (c) bright green (d) yellow
28. 28.🌈 In #910000 the red part is the hex number 91. What is it as a normal number?
29. 29.🌈 In #0000eb the blue part is the hex number eb. What is it as a normal number?
30. 30.🌈 Which colour of light is strongest in rgb(83, 228, 68)? (a) blue (b) green (c) red
31. 31.🌈 In #002c00 the green part is the hex number 2c. What is it as a normal number?
32. 32.🌈 Which colour is #00ffff? (a) magenta (b) cyan (c) bright green (d) red
33. 33.🌈 In #4f0000 the red part is the hex number 4f. What is it as a normal number?
34. 34.🌈 In #d00000 the red part is the hex number d0. What is it as a normal number?
35. 35.🌈 In #0000a2 the blue part is the hex number a2. What is it as a normal number?
36. 36.🌈 Which colour of light is strongest in rgb(86, 181, 98)? (a) red (b) blue (c) green
37. 37.🌈 In #006500 the green part is the hex number 65. What is it as a normal number?
38. 38.🌈 Which colour is #000000? (a) bright green (b) blue (c) yellow (d) black
39. 39.🌈 Which colour of light is strongest in rgb(48, 191, 28)? (a) red (b) green (c) blue
40. 40.🌈 Which colour is #ffffff? (a) red (b) cyan (c) bright green (d) white

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