CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 219 · 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) 255 (b) 100 (c) 1000 (d) 99
2. 2.🌈 Which colour is #ffff00? (a) magenta (b) red (c) blue (d) yellow
3. 3.🌈 In #005b00 the green part is the hex number 5b. What is it as a normal number?
4. 4.🌈 Which colour is #00ffff? (a) black (b) magenta (c) red (d) cyan
5. 5.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 4 (b) 6 (c) 2 (d) 3
6. 6.🌈 Which colour is #0000ff? (a) blue (b) black (c) cyan (d) bright green
7. 7.🌈 Which colour is rgb(0, 0, 255)? (a) black (b) blue (c) cyan (d) magenta
8. 8.🌈 Which colour is rgb(255, 255, 0)? (a) bright green (b) magenta (c) black (d) yellow
9. 9.🌈 Which colour of light is strongest in rgb(105, 121, 157)? (a) blue (b) green (c) red
10. 10.🌈 Which colour is #ffffff? (a) white (b) blue (c) red (d) black
11. 11.🌈 Which colour of light is strongest in rgb(62, 138, 195)? (a) red (b) green (c) blue
12. 12.🌈 In #rrggbb, which colour do the last two digits give? (a) green (b) blue (c) white (d) red
13. 13.🌈 Which colour of light is strongest in rgb(233, 16, 88)? (a) red (b) green (c) blue
14. 14.🌈 Which colour is rgb(255, 0, 0)? (a) bright green (b) white (c) red (d) black
15. 15.🌈 Which colour is #ff0000? (a) red (b) cyan (c) blue (d) magenta
16. 16.🌈 Which hex code is white? (a) #0000ff (b) #ffffff (c) #ff00ff (d) #000000
17. 17.🌈 Which colour is rgb(255, 255, 255)? (a) red (b) white (c) magenta (d) cyan
18. 18.🌈 Which hex code is yellow? (a) #00ff00 (b) #ffff00 (c) #00ffff (d) #ff00ff
19. 19.🌈 Which colour is #00ff00? (a) yellow (b) cyan (c) bright green (d) red
20. 20.🌈 In #rrggbb, which colour do the first two digits give? (a) black (b) blue (c) red (d) green
21. 21.🌈 Which colour is rgb(0, 255, 255)? (a) blue (b) magenta (c) cyan (d) yellow
22. 22.🌈 Which colour of light is strongest in rgb(79, 83, 170)? (a) green (b) red (c) blue
23. 23.🌈 Which colour of light is strongest in rgb(124, 161, 74)? (a) blue (b) red (c) green
24. 24.🌈 Which colour is rgb(255, 0, 255)? (a) bright green (b) magenta (c) yellow (d) red
25. 25.🌈 In #000011 the blue part is the hex number 11. What is it as a normal number?
26. 26.🌈 Which hex code is blue? (a) #0000ff (b) #00ff00 (c) #ffffff (d) #00ffff
27. 27.🌈 Hex digits go 0 to 9, then A to which letter? (a) F (b) G (c) J (d) Z
28. 28.🌈 In #00009b the blue part is the hex number 9b. What is it as a normal number?
29. 29.🌈 Which colour of light is strongest in rgb(174, 92, 14)? (a) blue (b) green (c) red
30. 30.🌈 In #0d0000 the red part is the hex number 0d. What is it as a normal number?
31. 31.🌈 Which colour of light is strongest in rgb(151, 138, 2)? (a) blue (b) red (c) green
32. 32.🌈 Which colour of light is strongest in rgb(152, 111, 134)? (a) green (b) red (c) blue
33. 33.🌈 Which colour is rgb(0, 0, 0)? (a) black (b) red (c) yellow (d) magenta
34. 34.🌈 Which hex code is black? (a) #ff0000 (b) #000000 (c) #ff00ff (d) #ffffff
35. 35.🌈 Which colour of light is strongest in rgb(45, 101, 151)? (a) red (b) green (c) blue
36. 36.🌈 Which colour is rgb(0, 255, 0)? (a) red (b) cyan (c) white (d) bright green
37. 37.🌈 Which hex code is cyan? (a) #00ffff (b) #ff0000 (c) #ffffff (d) #0000ff
38. 38.🌈 In #2a0000 the red part is the hex number 2a. What is it as a normal number?
39. 39.🌈 Which colour of light is strongest in rgb(90, 169, 39)? (a) blue (b) green (c) red
40. 40.🌈 Which colour of light is strongest in rgb(164, 79, 59)? (a) red (b) green (c) blue

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