CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 123 · 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(53, 210, 10)? (a) red (b) green (c) blue
2. 2.🌈 In #rrggbb, which colour do the last two digits give? (a) red (b) green (c) blue (d) white
3. 3.🌈 Which colour is rgb(0, 255, 255)? (a) black (b) red (c) bright green (d) cyan
4. 4.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 4 (b) 3 (c) 6 (d) 2
5. 5.🌈 In #000009 the blue part is the hex number 09. What is it as a normal number?
6. 6.🌈 In #bd0000 the red part is the hex number bd. What is it as a normal number?
7. 7.🌈 In #340000 the red part is the hex number 34. What is it as a normal number?
8. 8.🌈 Hex digits go 0 to 9, then A to which letter? (a) Z (b) G (c) F (d) J
9. 9.🌈 In #ef0000 the red part is the hex number ef. What is it as a normal number?
10. 10.🌈 Which colour is #0000ff? (a) blue (b) black (c) red (d) bright green
11. 11.🌈 Which colour is rgb(255, 255, 0)? (a) blue (b) yellow (c) bright green (d) black
12. 12.🌈 Which hex code is black? (a) #0000ff (b) #00ff00 (c) #000000 (d) #ff0000
13. 13.🌈 In #220000 the red part is the hex number 22. What is it as a normal number?
14. 14.🌈 Which hex code is blue? (a) #ff00ff (b) #0000ff (c) #ffffff (d) #ffff00
15. 15.🌈 Which colour is rgb(0, 0, 0)? (a) blue (b) black (c) white (d) magenta
16. 16.🌈 Which hex code is magenta? (a) #00ff00 (b) #000000 (c) #0000ff (d) #ff00ff
17. 17.🌈 Which hex code is red? (a) #00ffff (b) #ff00ff (c) #ff0000 (d) #000000
18. 18.🌈 What is the biggest number one colour can have in rgb()? (a) 1000 (b) 100 (c) 99 (d) 255
19. 19.🌈 In #000088 the blue part is the hex number 88. What is it as a normal number?
20. 20.🌈 In #a80000 the red part is the hex number a8. What is it as a normal number?
21. 21.🌈 In #000019 the blue part is the hex number 19. What is it as a normal number?
22. 22.🌈 Which colour of light is strongest in rgb(150, 63, 30)? (a) red (b) blue (c) green
23. 23.🌈 Which colour of light is strongest in rgb(132, 78, 191)? (a) red (b) blue (c) green
24. 24.🌈 In #000031 the blue part is the hex number 31. What is it as a normal number?
25. 25.🌈 In #000033 the blue part is the hex number 33. What is it as a normal number?
26. 26.🌈 Which colour is #00ff00? (a) bright green (b) magenta (c) black (d) blue
27. 27.🌈 In #e50000 the red part is the hex number e5. What is it as a normal number?
28. 28.🌈 Which colour is #ffff00? (a) black (b) magenta (c) yellow (d) bright green
29. 29.🌈 In #rrggbb, which colour do the first two digits give? (a) black (b) green (c) blue (d) red
30. 30.🌈 Which hex code is white? (a) #ffffff (b) #000000 (c) #0000ff (d) #ff0000
31. 31.🌈 Which colour of light is strongest in rgb(99, 180, 96)? (a) blue (b) green (c) red
32. 32.🌈 Which colour is #ff00ff? (a) red (b) bright green (c) blue (d) magenta
33. 33.🌈 Which colour of light is strongest in rgb(16, 96, 176)? (a) red (b) blue (c) green
34. 34.🌈 Which colour is rgb(255, 0, 255)? (a) magenta (b) blue (c) bright green (d) yellow
35. 35.🌈 In #8d0000 the red part is the hex number 8d. What is it as a normal number?
36. 36.🌈 Which colour is #00ffff? (a) blue (b) white (c) cyan (d) bright green
37. 37.🌈 Which colour is rgb(255, 0, 0)? (a) bright green (b) yellow (c) red (d) cyan
38. 38.🌈 Which colour is #000000? (a) blue (b) magenta (c) black (d) white
39. 39.🌈 In #0000ae the blue part is the hex number ae. What is it as a normal number?
40. 40.🌈 Which colour of light is strongest in rgb(173, 87, 113)? (a) red (b) green (c) blue

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