CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 320 · 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.🌈 What is the biggest number one colour can have in rgb()? (a) 1000 (b) 100 (c) 255 (d) 99
2. 2.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 4 (b) 2 (c) 3 (d) 6
3. 3.🌈 In #rrggbb, which colour do the last two digits give? (a) white (b) red (c) blue (d) green
4. 4.🌈 Which colour is #000000? (a) white (b) black (c) red (d) blue
5. 5.🌈 In #060000 the red part is the hex number 06. What is it as a normal number?
6. 6.🌈 Which colour of light is strongest in rgb(161, 8, 77)? (a) blue (b) green (c) red
7. 7.🌈 In #210000 the red part is the hex number 21. What is it as a normal number?
8. 8.🌈 Which colour of light is strongest in rgb(118, 220, 97)? (a) red (b) blue (c) green
9. 9.🌈 In #008600 the green part is the hex number 86. What is it as a normal number?
10. 10.🌈 Which colour is #ffff00? (a) magenta (b) black (c) blue (d) yellow
11. 11.🌈 In #000046 the blue part is the hex number 46. What is it as a normal number?
12. 12.🌈 Hex digits go 0 to 9, then A to which letter? (a) J (b) F (c) Z (d) G
13. 13.🌈 Which colour is rgb(255, 0, 0)? (a) red (b) bright green (c) black (d) yellow
14. 14.🌈 In #b80000 the red part is the hex number b8. What is it as a normal number?
15. 15.🌈 Which hex code is cyan? (a) #00ff00 (b) #000000 (c) #00ffff (d) #ffffff
16. 16.🌈 Which hex code is blue? (a) #00ffff (b) #0000ff (c) #ff0000 (d) #00ff00
17. 17.🌈 Which colour is #ffffff? (a) red (b) white (c) cyan (d) magenta
18. 18.🌈 Which hex code is yellow? (a) #000000 (b) #00ff00 (c) #ffff00 (d) #ff0000
19. 19.🌈 In #ba0000 the red part is the hex number ba. What is it as a normal number?
20. 20.🌈 Which colour is #ff0000? (a) black (b) red (c) blue (d) bright green
21. 21.🌈 In #rrggbb, which colour do the first two digits give? (a) red (b) black (c) blue (d) green
22. 22.🌈 In #0000fa the blue part is the hex number fa. What is it as a normal number?
23. 23.🌈 Which colour is #00ffff? (a) black (b) cyan (c) white (d) red
24. 24.🌈 Which colour is #ff00ff? (a) bright green (b) black (c) magenta (d) white
25. 25.🌈 Which colour of light is strongest in rgb(212, 122, 99)? (a) red (b) green (c) blue
26. 26.🌈 Which colour is rgb(255, 0, 255)? (a) magenta (b) white (c) blue (d) black
27. 27.🌈 Which hex code is red? (a) #ff0000 (b) #000000 (c) #0000ff (d) #ff00ff
28. 28.🌈 Which hex code is magenta? (a) #ffffff (b) #00ff00 (c) #ff00ff (d) #ffff00
29. 29.🌈 Which colour of light is strongest in rgb(55, 164, 46)? (a) green (b) blue (c) red
30. 30.🌈 Which colour of light is strongest in rgb(15, 212, 55)? (a) green (b) red (c) blue
31. 31.🌈 In #00df00 the green part is the hex number df. What is it as a normal number?
32. 32.🌈 In #0000a0 the blue part is the hex number a0. What is it as a normal number?
33. 33.🌈 Which colour is #00ff00? (a) bright green (b) white (c) blue (d) black
34. 34.🌈 Which colour is rgb(0, 255, 255)? (a) cyan (b) yellow (c) magenta (d) bright green
35. 35.🌈 In #00003c the blue part is the hex number 3c. What is it as a normal number?
36. 36.🌈 Which colour is rgb(0, 0, 255)? (a) yellow (b) magenta (c) blue (d) black
37. 37.🌈 Which colour is rgb(0, 0, 0)? (a) bright green (b) red (c) white (d) black
38. 38.🌈 Which colour is rgb(0, 255, 0)? (a) blue (b) yellow (c) black (d) bright green
39. 39.🌈 In #000082 the blue part is the hex number 82. What is it as a normal number?
40. 40.🌈 In #004200 the green part is the hex number 42. What is it as a normal number?

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