CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 129 · 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 hex code is cyan? (a) #ff0000 (b) #000000 (c) #00ff00 (d) #00ffff
2. 2.🌈 Which colour of light is strongest in rgb(49, 60, 162)? (a) red (b) green (c) blue
3. 3.🌈 In #001d00 the green part is the hex number 1d. What is it as a normal number?
4. 4.🌈 Which colour of light is strongest in rgb(5, 89, 236)? (a) blue (b) red (c) green
5. 5.🌈 Which hex code is magenta? (a) #ff0000 (b) #ff00ff (c) #00ff00 (d) #0000ff
6. 6.🌈 Which colour is rgb(255, 0, 0)? (a) red (b) black (c) white (d) bright green
7. 7.🌈 Hex digits go 0 to 9, then A to which letter? (a) Z (b) G (c) F (d) J
8. 8.🌈 In #0a0000 the red part is the hex number 0a. What is it as a normal number?
9. 9.🌈 In #a70000 the red part is the hex number a7. What is it as a normal number?
10. 10.🌈 In #000019 the blue part is the hex number 19. What is it as a normal number?
11. 11.🌈 Which colour is #ff00ff? (a) black (b) yellow (c) blue (d) magenta
12. 12.🌈 Which colour is #00ff00? (a) bright green (b) black (c) magenta (d) cyan
13. 13.🌈 Which colour of light is strongest in rgb(21, 205, 102)? (a) blue (b) red (c) green
14. 14.🌈 Which colour is rgb(0, 0, 255)? (a) blue (b) magenta (c) white (d) cyan
15. 15.🌈 Which hex code is bright green? (a) #00ff00 (b) #0000ff (c) #ff00ff (d) #ff0000
16. 16.🌈 In #rrggbb, which colour do the last two digits give? (a) red (b) green (c) blue (d) white
17. 17.🌈 Which colour is #ffffff? (a) blue (b) cyan (c) magenta (d) white
18. 18.🌈 Which colour of light is strongest in rgb(164, 20, 90)? (a) blue (b) red (c) green
19. 19.🌈 Which hex code is blue? (a) #ffffff (b) #00ff00 (c) #ff00ff (d) #0000ff
20. 20.🌈 In #f90000 the red part is the hex number f9. What is it as a normal number?
21. 21.🌈 Which colour is #ff0000? (a) white (b) black (c) magenta (d) red
22. 22.🌈 In #0000a9 the blue part is the hex number a9. What is it as a normal number?
23. 23.🌈 Which colour is #000000? (a) magenta (b) black (c) red (d) yellow
24. 24.🌈 Which colour of light is strongest in rgb(85, 5, 191)? (a) blue (b) red (c) green
25. 25.🌈 In #000048 the blue part is the hex number 48. What is it as a normal number?
26. 26.🌈 Which colour is rgb(0, 255, 0)? (a) white (b) red (c) bright green (d) black
27. 27.🌈 Which colour is #00ffff? (a) white (b) bright green (c) yellow (d) cyan
28. 28.🌈 In #rrggbb, which colour do the first two digits give? (a) red (b) blue (c) green (d) black
29. 29.🌈 Which colour of light is strongest in rgb(131, 80, 206)? (a) blue (b) red (c) green
30. 30.🌈 Which colour is rgb(255, 255, 255)? (a) yellow (b) white (c) magenta (d) red
31. 31.🌈 Which colour of light is strongest in rgb(105, 235, 9)? (a) green (b) blue (c) red
32. 32.🌈 Which colour of light is strongest in rgb(40, 79, 155)? (a) blue (b) green (c) red
33. 33.🌈 Which colour of light is strongest in rgb(73, 219, 46)? (a) red (b) green (c) blue
34. 34.🌈 What is the biggest number one colour can have in rgb()? (a) 100 (b) 255 (c) 1000 (d) 99
35. 35.🌈 Which colour of light is strongest in rgb(54, 158, 0)? (a) blue (b) green (c) red
36. 36.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 6 (b) 3 (c) 4 (d) 2
37. 37.🌈 In #100000 the red part is the hex number 10. What is it as a normal number?
38. 38.🌈 Which hex code is white? (a) #00ffff (b) #ffffff (c) #00ff00 (d) #ff0000
39. 39.🌈 In #005d00 the green part is the hex number 5d. What is it as a normal number?
40. 40.🌈 In #120000 the red part is the hex number 12. What is it as a normal number?

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