CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 108 · 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.🌈 In #b90000 the red part is the hex number b9. What is it as a normal number?
2. 2.🌈 Hex digits go 0 to 9, then A to which letter? (a) Z (b) G (c) J (d) F
3. 3.🌈 Which hex code is yellow? (a) #ff0000 (b) #ffff00 (c) #ff00ff (d) #000000
4. 4.🌈 In #000000 the green part is the hex number 00. What is it as a normal number?
5. 5.🌈 Which colour is rgb(255, 255, 0)? (a) white (b) cyan (c) bright green (d) yellow
6. 6.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 4 (b) 3 (c) 2 (d) 6
7. 7.🌈 Which colour is #ff00ff? (a) cyan (b) black (c) magenta (d) red
8. 8.🌈 Which hex code is blue? (a) #ffffff (b) #ff00ff (c) #00ff00 (d) #0000ff
9. 9.🌈 Which colour is #0000ff? (a) red (b) blue (c) white (d) magenta
10. 10.🌈 Which hex code is white? (a) #00ff00 (b) #ffffff (c) #000000 (d) #ff0000
11. 11.🌈 Which colour is #ff0000? (a) yellow (b) white (c) blue (d) red
12. 12.🌈 In #00003a the blue part is the hex number 3a. What is it as a normal number?
13. 13.🌈 Which colour is #ffff00? (a) red (b) yellow (c) white (d) blue
14. 14.🌈 What is the biggest number one colour can have in rgb()? (a) 100 (b) 99 (c) 255 (d) 1000
15. 15.🌈 Which colour is rgb(255, 0, 255)? (a) white (b) yellow (c) magenta (d) black
16. 16.🌈 Which colour is rgb(255, 0, 0)? (a) black (b) blue (c) bright green (d) red
17. 17.🌈 In #0000ce the blue part is the hex number ce. What is it as a normal number?
18. 18.🌈 In #000000 the blue part is the hex number 00. What is it as a normal number?
19. 19.🌈 Which colour of light is strongest in rgb(130, 37, 215)? (a) red (b) blue (c) green
20. 20.🌈 In #rrggbb, which colour do the first two digits give? (a) black (b) red (c) blue (d) green
21. 21.🌈 Which hex code is magenta? (a) #000000 (b) #ffffff (c) #00ff00 (d) #ff00ff
22. 22.🌈 In #420000 the red part is the hex number 42. What is it as a normal number?
23. 23.🌈 Which hex code is black? (a) #000000 (b) #0000ff (c) #ff00ff (d) #00ffff
24. 24.🌈 In #rrggbb, which colour do the last two digits give? (a) green (b) blue (c) white (d) red
25. 25.🌈 Which hex code is red? (a) #00ff00 (b) #0000ff (c) #ff0000 (d) #ff00ff
26. 26.🌈 In #009300 the green part is the hex number 93. What is it as a normal number?
27. 27.🌈 In #210000 the red part is the hex number 21. What is it as a normal number?
28. 28.🌈 Which colour is rgb(255, 255, 255)? (a) yellow (b) blue (c) white (d) red
29. 29.🌈 Which colour is #00ff00? (a) bright green (b) blue (c) magenta (d) cyan
30. 30.🌈 Which colour is #000000? (a) red (b) white (c) cyan (d) black
31. 31.🌈 Which colour is rgb(0, 0, 255)? (a) bright green (b) red (c) blue (d) yellow
32. 32.🌈 Which colour is rgb(0, 255, 255)? (a) bright green (b) red (c) cyan (d) yellow
33. 33.🌈 Which colour is #00ffff? (a) cyan (b) black (c) magenta (d) bright green
34. 34.🌈 Which colour of light is strongest in rgb(80, 212, 110)? (a) green (b) red (c) blue
35. 35.🌈 Which colour of light is strongest in rgb(139, 70, 246)? (a) green (b) blue (c) red
36. 36.🌈 Which colour of light is strongest in rgb(24, 31, 193)? (a) green (b) blue (c) red
37. 37.🌈 Which colour of light is strongest in rgb(65, 67, 192)? (a) red (b) green (c) blue
38. 38.🌈 Which colour of light is strongest in rgb(193, 112, 93)? (a) green (b) blue (c) red
39. 39.🌈 Which hex code is cyan? (a) #00ffff (b) #000000 (c) #00ff00 (d) #ff0000
40. 40.🌈 In #00007a the blue part is the hex number 7a. What is it as a normal number?

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