CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 322 · 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 #rrggbb, which colour do the last two digits give? (a) blue (b) white (c) green (d) red
2. 2.🌈 Which colour is #00ffff? (a) black (b) yellow (c) red (d) cyan
3. 3.🌈 Which colour is #ffff00? (a) cyan (b) black (c) yellow (d) bright green
4. 4.🌈 Which colour is rgb(255, 255, 255)? (a) yellow (b) blue (c) bright green (d) white
5. 5.🌈 Which colour is rgb(0, 0, 255)? (a) blue (b) magenta (c) white (d) yellow
6. 6.🌈 Which colour is rgb(255, 0, 0)? (a) yellow (b) red (c) bright green (d) magenta
7. 7.🌈 Which colour of light is strongest in rgb(205, 19, 47)? (a) blue (b) green (c) red
8. 8.🌈 Which colour is rgb(255, 255, 0)? (a) white (b) cyan (c) magenta (d) yellow
9. 9.🌈 Which hex code is red? (a) #0000ff (b) #ff0000 (c) #00ff00 (d) #000000
10. 10.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 6 (b) 3 (c) 2 (d) 4
11. 11.🌈 Which colour of light is strongest in rgb(49, 169, 7)? (a) green (b) red (c) blue
12. 12.🌈 Which colour of light is strongest in rgb(85, 54, 220)? (a) red (b) blue (c) green
13. 13.🌈 In #140000 the red part is the hex number 14. What is it as a normal number?
14. 14.🌈 Which colour is #00ff00? (a) bright green (b) magenta (c) red (d) white
15. 15.🌈 Which colour is rgb(0, 255, 0)? (a) bright green (b) black (c) blue (d) red
16. 16.🌈 In #000084 the blue part is the hex number 84. What is it as a normal number?
17. 17.🌈 Which colour is #0000ff? (a) cyan (b) red (c) blue (d) bright green
18. 18.🌈 Hex digits go 0 to 9, then A to which letter? (a) F (b) J (c) G (d) Z
19. 19.🌈 What is the biggest number one colour can have in rgb()? (a) 100 (b) 255 (c) 99 (d) 1000
20. 20.🌈 In #rrggbb, which colour do the first two digits give? (a) black (b) green (c) red (d) blue
21. 21.🌈 Which colour of light is strongest in rgb(232, 18, 98)? (a) green (b) red (c) blue
22. 22.🌈 Which hex code is bright green? (a) #0000ff (b) #ffffff (c) #00ffff (d) #00ff00
23. 23.🌈 Which colour is rgb(255, 0, 255)? (a) red (b) yellow (c) magenta (d) black
24. 24.🌈 Which colour of light is strongest in rgb(64, 204, 1)? (a) blue (b) red (c) green
25. 25.🌈 Which hex code is black? (a) #0000ff (b) #00ffff (c) #000000 (d) #00ff00
26. 26.🌈 Which hex code is blue? (a) #ff00ff (b) #0000ff (c) #00ff00 (d) #00ffff
27. 27.🌈 Which colour is #ffffff? (a) white (b) yellow (c) red (d) blue
28. 28.🌈 Which colour is #ff00ff? (a) blue (b) cyan (c) black (d) magenta
29. 29.🌈 In #00007d the blue part is the hex number 7d. What is it as a normal number?
30. 30.🌈 Which colour of light is strongest in rgb(11, 54, 156)? (a) green (b) blue (c) red
31. 31.🌈 Which hex code is cyan? (a) #ff0000 (b) #ff00ff (c) #ffff00 (d) #00ffff
32. 32.🌈 Which hex code is yellow? (a) #00ff00 (b) #ff0000 (c) #ffff00 (d) #ff00ff
33. 33.🌈 Which hex code is magenta? (a) #ffffff (b) #00ffff (c) #ff00ff (d) #ffff00
34. 34.🌈 Which colour is rgb(0, 0, 0)? (a) black (b) red (c) blue (d) magenta
35. 35.🌈 Which colour of light is strongest in rgb(41, 134, 206)? (a) green (b) blue (c) red
36. 36.🌈 In #002300 the green part is the hex number 23. What is it as a normal number?
37. 37.🌈 Which colour of light is strongest in rgb(95, 154, 110)? (a) green (b) red (c) blue
38. 38.🌈 In #00002d the blue part is the hex number 2d. What is it as a normal number?
39. 39.🌈 In #940000 the red part is the hex number 94. What is it as a normal number?
40. 40.🌈 Which colour of light is strongest in rgb(50, 27, 222)? (a) red (b) green (c) blue

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