CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 47 · 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 #ffff00? (a) white (b) cyan (c) magenta (d) yellow
2. 2.🌈 Which colour is rgb(0, 0, 255)? (a) black (b) magenta (c) blue (d) red
3. 3.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 6 (b) 2 (c) 3 (d) 4
4. 4.🌈 In #000051 the blue part is the hex number 51. What is it as a normal number?
5. 5.🌈 Which colour is #00ff00? (a) white (b) red (c) black (d) bright green
6. 6.🌈 Which colour is #ff0000? (a) blue (b) black (c) white (d) red
7. 7.🌈 Which colour of light is strongest in rgb(250, 89, 45)? (a) blue (b) green (c) red
8. 8.🌈 Which colour is rgb(0, 0, 0)? (a) black (b) cyan (c) red (d) white
9. 9.🌈 What is the biggest number one colour can have in rgb()? (a) 255 (b) 100 (c) 1000 (d) 99
10. 10.🌈 Which colour of light is strongest in rgb(76, 69, 197)? (a) blue (b) red (c) green
11. 11.🌈 Which hex code is cyan? (a) #ff00ff (b) #ffff00 (c) #00ff00 (d) #00ffff
12. 12.🌈 Hex digits go 0 to 9, then A to which letter? (a) F (b) G (c) Z (d) J
13. 13.🌈 Which hex code is magenta? (a) #ff00ff (b) #00ffff (c) #00ff00 (d) #0000ff
14. 14.🌈 In #rrggbb, which colour do the first two digits give? (a) red (b) green (c) blue (d) black
15. 15.🌈 Which colour of light is strongest in rgb(19, 201, 16)? (a) red (b) blue (c) green
16. 16.🌈 Which hex code is blue? (a) #ff0000 (b) #00ffff (c) #0000ff (d) #00ff00
17. 17.🌈 Which colour is rgb(255, 0, 255)? (a) red (b) magenta (c) black (d) cyan
18. 18.🌈 Which colour of light is strongest in rgb(222, 76, 95)? (a) red (b) green (c) blue
19. 19.🌈 In #00b100 the green part is the hex number b1. What is it as a normal number?
20. 20.🌈 Which colour of light is strongest in rgb(87, 41, 151)? (a) blue (b) green (c) red
21. 21.🌈 In #000006 the blue part is the hex number 06. What is it as a normal number?
22. 22.🌈 Which hex code is white? (a) #0000ff (b) #00ffff (c) #ffff00 (d) #ffffff
23. 23.🌈 Which hex code is black? (a) #000000 (b) #ffffff (c) #ff0000 (d) #0000ff
24. 24.🌈 Which hex code is yellow? (a) #ffff00 (b) #ff00ff (c) #00ffff (d) #ff0000
25. 25.🌈 In #110000 the red part is the hex number 11. What is it as a normal number?
26. 26.🌈 Which colour is rgb(0, 255, 255)? (a) red (b) blue (c) bright green (d) cyan
27. 27.🌈 In #00003e the blue part is the hex number 3e. What is it as a normal number?
28. 28.🌈 In #440000 the red part is the hex number 44. What is it as a normal number?
29. 29.🌈 Which colour is rgb(255, 0, 0)? (a) yellow (b) magenta (c) red (d) white
30. 30.🌈 Which colour of light is strongest in rgb(28, 154, 49)? (a) blue (b) green (c) red
31. 31.🌈 In #0000e8 the blue part is the hex number e8. What is it as a normal number?
32. 32.🌈 Which colour of light is strongest in rgb(176, 27, 116)? (a) blue (b) green (c) red
33. 33.🌈 Which colour of light is strongest in rgb(138, 220, 72)? (a) blue (b) green (c) red
34. 34.🌈 In #340000 the red part is the hex number 34. What is it as a normal number?
35. 35.🌈 In #f20000 the red part is the hex number f2. What is it as a normal number?
36. 36.🌈 Which colour is rgb(255, 255, 255)? (a) magenta (b) red (c) white (d) cyan
37. 37.🌈 Which colour is #00ffff? (a) cyan (b) yellow (c) bright green (d) red
38. 38.🌈 In #650000 the red part is the hex number 65. What is it as a normal number?
39. 39.🌈 Which colour of light is strongest in rgb(45, 10, 214)? (a) blue (b) green (c) red
40. 40.🌈 Which colour of light is strongest in rgb(20, 242, 19)? (a) blue (b) red (c) green

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