CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 83 · 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(204, 57, 22)? (a) green (b) blue (c) red
2. 2.🌈 Which colour is #ff0000? (a) magenta (b) yellow (c) red (d) cyan
3. 3.🌈 In #ce0000 the red part is the hex number ce. What is it as a normal number?
4. 4.🌈 In #rrggbb, which colour do the first two digits give? (a) red (b) blue (c) black (d) green
5. 5.🌈 Which colour of light is strongest in rgb(29, 47, 183)? (a) red (b) green (c) blue
6. 6.🌈 Which hex code is magenta? (a) #ff0000 (b) #00ffff (c) #0000ff (d) #ff00ff
7. 7.🌈 In #rrggbb, which colour do the last two digits give? (a) red (b) white (c) blue (d) green
8. 8.🌈 Which colour is rgb(0, 0, 255)? (a) blue (b) white (c) black (d) bright green
9. 9.🌈 Which hex code is cyan? (a) #000000 (b) #ffffff (c) #00ffff (d) #ffff00
10. 10.🌈 What is the biggest number one colour can have in rgb()? (a) 100 (b) 99 (c) 1000 (d) 255
11. 11.🌈 Which colour is rgb(255, 0, 0)? (a) cyan (b) bright green (c) white (d) red
12. 12.🌈 In #560000 the red part is the hex number 56. What is it as a normal number?
13. 13.🌈 In #004400 the green part is the hex number 44. What is it as a normal number?
14. 14.🌈 Which colour is #ff00ff? (a) red (b) bright green (c) magenta (d) blue
15. 15.🌈 In #00005c the blue part is the hex number 5c. What is it as a normal number?
16. 16.🌈 Which hex code is blue? (a) #0000ff (b) #ffff00 (c) #ff00ff (d) #ff0000
17. 17.🌈 Which colour is #00ffff? (a) cyan (b) yellow (c) red (d) blue
18. 18.🌈 Which colour is rgb(0, 255, 255)? (a) magenta (b) red (c) cyan (d) yellow
19. 19.🌈 Which colour of light is strongest in rgb(21, 45, 233)? (a) green (b) red (c) blue
20. 20.🌈 Which colour of light is strongest in rgb(106, 181, 105)? (a) blue (b) red (c) green
21. 21.🌈 Which colour is rgb(255, 255, 255)? (a) magenta (b) cyan (c) red (d) white
22. 22.🌈 Hex digits go 0 to 9, then A to which letter? (a) Z (b) G (c) J (d) F
23. 23.🌈 Which colour of light is strongest in rgb(160, 93, 92)? (a) red (b) blue (c) green
24. 24.🌈 Which colour of light is strongest in rgb(13, 236, 134)? (a) red (b) blue (c) green
25. 25.🌈 In #00ab00 the green part is the hex number ab. What is it as a normal number?
26. 26.🌈 Which colour is #0000ff? (a) black (b) bright green (c) magenta (d) blue
27. 27.🌈 Which colour is rgb(0, 0, 0)? (a) black (b) bright green (c) cyan (d) magenta
28. 28.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 2 (b) 4 (c) 6 (d) 3
29. 29.🌈 In #fa0000 the red part is the hex number fa. What is it as a normal number?
30. 30.🌈 Which hex code is yellow? (a) #ff0000 (b) #ffff00 (c) #00ff00 (d) #00ffff
31. 31.🌈 In #00009e the blue part is the hex number 9e. What is it as a normal number?
32. 32.🌈 Which hex code is bright green? (a) #00ffff (b) #ffff00 (c) #ff0000 (d) #00ff00
33. 33.🌈 In #b00000 the red part is the hex number b0. What is it as a normal number?
34. 34.🌈 In #000035 the blue part is the hex number 35. What is it as a normal number?
35. 35.🌈 In #000019 the blue part is the hex number 19. What is it as a normal number?
36. 36.🌈 Which hex code is white? (a) #ff0000 (b) #ffff00 (c) #ffffff (d) #00ffff
37. 37.🌈 Which colour is rgb(0, 255, 0)? (a) yellow (b) red (c) blue (d) bright green
38. 38.🌈 Which colour of light is strongest in rgb(58, 229, 51)? (a) green (b) red (c) blue
39. 39.🌈 In #000d00 the green part is the hex number 0d. What is it as a normal number?
40. 40.🌈 In #008300 the green part is the hex number 83. What is it as a normal number?

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