CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 144 · 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) #00ffff (b) #ff00ff (c) #ffffff (d) #0000ff
2. 2.🌈 Which colour is rgb(0, 255, 0)? (a) yellow (b) blue (c) bright green (d) cyan
3. 3.🌈 Which colour is rgb(0, 255, 255)? (a) cyan (b) blue (c) white (d) yellow
4. 4.🌈 Which hex code is yellow? (a) #ffffff (b) #00ffff (c) #ffff00 (d) #00ff00
5. 5.🌈 Which colour is #0000ff? (a) cyan (b) yellow (c) black (d) blue
6. 6.🌈 What is the biggest number one colour can have in rgb()? (a) 100 (b) 1000 (c) 255 (d) 99
7. 7.🌈 Which colour is #ffffff? (a) blue (b) bright green (c) cyan (d) white
8. 8.🌈 Which colour is #00ff00? (a) cyan (b) bright green (c) yellow (d) black
9. 9.🌈 In #f80000 the red part is the hex number f8. What is it as a normal number?
10. 10.🌈 Which colour of light is strongest in rgb(112, 249, 21)? (a) green (b) blue (c) red
11. 11.🌈 Which colour of light is strongest in rgb(174, 117, 75)? (a) green (b) blue (c) red
12. 12.🌈 Which colour of light is strongest in rgb(82, 158, 88)? (a) blue (b) red (c) green
13. 13.🌈 Which colour of light is strongest in rgb(203, 115, 133)? (a) red (b) green (c) blue
14. 14.🌈 Hex digits go 0 to 9, then A to which letter? (a) J (b) F (c) Z (d) G
15. 15.🌈 Which colour is #ffff00? (a) cyan (b) black (c) bright green (d) yellow
16. 16.🌈 Which colour of light is strongest in rgb(6, 227, 121)? (a) blue (b) red (c) green
17. 17.🌈 In #rrggbb, which colour do the first two digits give? (a) red (b) blue (c) green (d) black
18. 18.🌈 In #cf0000 the red part is the hex number cf. What is it as a normal number?
19. 19.🌈 Which colour is rgb(255, 0, 255)? (a) black (b) red (c) bright green (d) magenta
20. 20.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 4 (b) 6 (c) 3 (d) 2
21. 21.🌈 Which colour is #ff0000? (a) black (b) magenta (c) bright green (d) red
22. 22.🌈 Which colour is #000000? (a) bright green (b) black (c) cyan (d) white
23. 23.🌈 In #b00000 the red part is the hex number b0. What is it as a normal number?
24. 24.🌈 In #003000 the green part is the hex number 30. What is it as a normal number?
25. 25.🌈 Which colour is rgb(255, 255, 0)? (a) blue (b) yellow (c) magenta (d) bright green
26. 26.🌈 In #rrggbb, which colour do the last two digits give? (a) white (b) blue (c) green (d) red
27. 27.🌈 Which colour of light is strongest in rgb(206, 140, 19)? (a) green (b) blue (c) red
28. 28.🌈 In #240000 the red part is the hex number 24. What is it as a normal number?
29. 29.🌈 Which hex code is black? (a) #000000 (b) #ffff00 (c) #ff00ff (d) #ffffff
30. 30.🌈 Which colour is rgb(0, 0, 0)? (a) red (b) black (c) bright green (d) blue
31. 31.🌈 Which colour of light is strongest in rgb(10, 98, 247)? (a) blue (b) red (c) green
32. 32.🌈 In #050000 the red part is the hex number 05. What is it as a normal number?
33. 33.🌈 Which colour of light is strongest in rgb(77, 16, 169)? (a) blue (b) red (c) green
34. 34.🌈 In #00fc00 the green part is the hex number fc. What is it as a normal number?
35. 35.🌈 In #008800 the green part is the hex number 88. What is it as a normal number?
36. 36.🌈 Which hex code is bright green? (a) #00ffff (b) #000000 (c) #ff0000 (d) #00ff00
37. 37.🌈 Which colour of light is strongest in rgb(63, 244, 89)? (a) red (b) blue (c) green
38. 38.🌈 Which hex code is red? (a) #000000 (b) #0000ff (c) #ffffff (d) #ff0000
39. 39.🌈 Which colour of light is strongest in rgb(8, 57, 227)? (a) red (b) blue (c) green
40. 40.🌈 Which hex code is white? (a) #ffff00 (b) #ffffff (c) #00ffff (d) #00ff00

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