CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 345 · 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 of light is strongest in rgb(29, 75, 235)? (a) green (b) blue (c) red
2. 2.🌈 Which hex code is white? (a) #00ff00 (b) #ffff00 (c) #ff0000 (d) #ffffff
3. 3.🌈 In #0000a9 the blue part is the hex number a9. What is it as a normal number?
4. 4.🌈 Which colour of light is strongest in rgb(76, 205, 113)? (a) red (b) green (c) blue
5. 5.🌈 In #0b0000 the red part is the hex number 0b. What is it as a normal number?
6. 6.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 2 (b) 4 (c) 3 (d) 6
7. 7.🌈 Which colour is #00ff00? (a) red (b) yellow (c) white (d) bright green
8. 8.🌈 Which colour is rgb(255, 0, 0)? (a) yellow (b) magenta (c) black (d) red
9. 9.🌈 Which colour is #ffff00? (a) black (b) blue (c) magenta (d) yellow
10. 10.🌈 In #280000 the red part is the hex number 28. What is it as a normal number?
11. 11.🌈 In #00ff00 the green part is the hex number ff. What is it as a normal number?
12. 12.🌈 Hex digits go 0 to 9, then A to which letter? (a) J (b) Z (c) G (d) F
13. 13.🌈 In #rrggbb, which colour do the last two digits give? (a) blue (b) red (c) green (d) white
14. 14.🌈 In #rrggbb, which colour do the first two digits give? (a) red (b) green (c) blue (d) black
15. 15.🌈 In #330000 the red part is the hex number 33. What is it as a normal number?
16. 16.🌈 Which hex code is red? (a) #ff00ff (b) #000000 (c) #00ff00 (d) #ff0000
17. 17.🌈 Which colour is #000000? (a) yellow (b) bright green (c) black (d) blue
18. 18.🌈 Which colour is rgb(255, 255, 0)? (a) magenta (b) yellow (c) white (d) blue
19. 19.🌈 In #060000 the red part is the hex number 06. What is it as a normal number?
20. 20.🌈 Which hex code is cyan? (a) #00ffff (b) #0000ff (c) #ff0000 (d) #ffffff
21. 21.🌈 In #190000 the red part is the hex number 19. What is it as a normal number?
22. 22.🌈 In #00000d the blue part is the hex number 0d. What is it as a normal number?
23. 23.🌈 In #00f800 the green part is the hex number f8. What is it as a normal number?
24. 24.🌈 Which colour is #ff00ff? (a) cyan (b) bright green (c) magenta (d) red
25. 25.🌈 Which colour is rgb(0, 255, 255)? (a) white (b) black (c) bright green (d) cyan
26. 26.🌈 Which colour of light is strongest in rgb(191, 115, 110)? (a) green (b) red (c) blue
27. 27.🌈 Which colour is #ffffff? (a) white (b) cyan (c) bright green (d) black
28. 28.🌈 In #000a00 the green part is the hex number 0a. What is it as a normal number?
29. 29.🌈 Which colour of light is strongest in rgb(115, 174, 64)? (a) red (b) blue (c) green
30. 30.🌈 In #0000f9 the blue part is the hex number f9. What is it as a normal number?
31. 31.🌈 Which colour of light is strongest in rgb(140, 166, 0)? (a) blue (b) red (c) green
32. 32.🌈 In #008800 the green part is the hex number 88. What is it as a normal number?
33. 33.🌈 In #00003a the blue part is the hex number 3a. What is it as a normal number?
34. 34.🌈 Which hex code is blue? (a) #ffff00 (b) #000000 (c) #ffffff (d) #0000ff
35. 35.🌈 Which colour of light is strongest in rgb(2, 119, 247)? (a) red (b) green (c) blue
36. 36.🌈 Which colour is #0000ff? (a) bright green (b) magenta (c) blue (d) black
37. 37.🌈 What is the biggest number one colour can have in rgb()? (a) 255 (b) 1000 (c) 99 (d) 100
38. 38.🌈 Which colour is rgb(0, 255, 0)? (a) black (b) red (c) bright green (d) magenta
39. 39.🌈 Which hex code is bright green? (a) #00ff00 (b) #000000 (c) #0000ff (d) #00ffff
40. 40.🌈 In #eb0000 the red part is the hex number eb. What is it as a normal number?

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