← Line-follower programs lesson New set →

Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 57 · 40 questions
TalentJR

Robot tip (Turn towards the line): Left sees black → turn left; right sees black → turn right; both white → go forward. In an if / else if chain the first true rule wins (both black → the rule written first). With numbers: a reading below the threshold (for example below 40) means black.

NameDateTime takenScore ___ / 40
  1. 1.⬛ A line follower runs:
    if (left sees black) { turn left } else if (right sees black) { turn right } else { go forward }
    It checks its sensors 4 times (left–right): white–white, black–black, black–white, white–white. How many times does it turn right?
  2. 2.⬛ A line follower runs:
    if (left sees black) { turn left } else if (right sees black) { turn right } else { go forward }
    The left sensor sees white and the right sensor sees white. What does it do?     (a) go forward (b) turn left (c) turn right
  3. 3.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) nowhere (b) backwards (c) left (d) right
  4. 4.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 56. What does it do?     (a) turn left (b) turn right
  5. 5.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 65. What does it do?     (a) turn left (b) turn right
  6. 6.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 10 and the right sensor reads 80. What does it do?     (a) turn left (b) go forward (c) turn right
  7. 7.⬛ Going too fast round a sharp bend, a line follower may … (a) lose the line (b) grow wheels (c) get heavier (d) turn into a car
  8. 8.⬛ Why does a line follower wiggle a little as it drives? (a) its wheels are square (b) it is too cold (c) it is dancing (d) it keeps fixing its path
  9. 9.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 10. What does it do?     (a) turn left (b) turn right
  10. 10.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 30 and the right sensor reads 60. What does it do?     (a) turn left (b) go forward (c) turn right
  11. 11.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 24. What does it do?     (a) turn right (b) turn left
  12. 12.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 58. What does it do?     (a) turn left (b) turn right
  13. 13.⬛ A line follower runs:
    if (left sees black) { turn left } else if (right sees black) { turn right } else { go forward }
    It checks its sensors 4 times (left–right): black–black, white–black, black–white, white–white. How many times does it turn right?
  14. 14.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 72. What does it do?     (a) turn right (b) turn left
  15. 15.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 70 and the right sensor reads 55. What does it do?     (a) turn left (b) turn right (c) go forward
  16. 16.⬛ A line follower runs:
    if (left sees black) { turn left } else if (right sees black) { turn right } else { go forward }
    It checks its sensors 4 times (left–right): black–black, black–black, white–white, white–black. How many times does it turn right?
  17. 17.⬛ A line follower runs:
    if (left sees black) { turn left } else if (right sees black) { turn right } else { go forward }
    The left sensor sees black and the right sensor sees white. What does it do?     (a) go forward (b) turn right (c) turn left
  18. 18.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 12. What does it do?     (a) turn left (b) turn right
  19. 19.⬛ A line follower runs:
    if (left sees black) { turn left } else if (right sees black) { turn right } else { go forward }
    It checks its sensors 6 times (left–right): black–white, black–black, black–white, black–black, black–white, white–black. How many times does it turn right?
  20. 20.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 44. What does it do?     (a) turn left (b) turn right
  21. 21.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 67. What does it do?     (a) turn right (b) turn left
  22. 22.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 39. What does it do?     (a) turn right (b) turn left
  23. 23.⬛ A line follower runs:
    if (left sees black) { turn left } else if (right sees black) { turn right } else { go forward }
    It checks its sensors 6 times (left–right): white–black, black–white, white–black, black–black, white–white, white–black. How many times does it turn left?
  24. 24.⬛ A line follower runs:
    if (right sees black) { turn right } else if (left sees black) { turn left } else { go forward }
    The left sensor sees white and the right sensor sees white. What does it do?     (a) go forward (b) turn right (c) turn left
  25. 25.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 47. What does it do?     (a) turn right (b) turn left
  26. 26.⬛ A line follower runs:
    if (left sees black) { turn left } else if (right sees black) { turn right } else { go forward }
    It checks its sensors 6 times (left–right): black–white, black–black, white–black, white–white, black–black, black–white. How many times does it turn left?
  27. 27.⬛ A line follower runs:
    if (left sees black) { turn left } else if (right sees black) { turn right } else { go forward }
    It checks its sensors 6 times (left–right): black–black, white–white, black–black, white–white, white–black, white–black. How many times does it turn right?
  28. 28.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 70 and the right sensor reads 65. What does it do?     (a) go forward (b) turn right (c) turn left
  29. 29.⬛ A line follower runs:
    if (left sees black) { turn left } else if (right sees black) { turn right } else { go forward }
    It checks its sensors 6 times (left–right): black–white, white–white, white–black, white–black, black–black, black–black. How many times does it turn right?
  30. 30.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 55 and the right sensor reads 15. What does it do?     (a) turn right (b) go forward (c) turn left
  31. 31.⬛ A line follower runs:
    if (left sees black) { turn left } else if (right sees black) { turn right } else { go forward }
    It checks its sensors 4 times (left–right): white–white, black–black, white–black, white–white. How many times does it turn right?
  32. 32.⬛ A line follower runs:
    if (left sees black) { turn left } else if (right sees black) { turn right } else { go forward }
    The left sensor sees white and the right sensor sees black. What does it do?     (a) turn right (b) turn left (c) go forward
  33. 33.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 20 and the right sensor reads 10. What does it do?     (a) turn right (b) turn left (c) go forward
  34. 34.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 15 and the right sensor reads 55. What does it do?     (a) go forward (b) turn right (c) turn left
  35. 35.⬛ A line follower runs:
    if (left sees black) { turn left } else if (right sees black) { turn right } else { go forward }
    It checks its sensors 4 times (left–right): white–black, white–black, black–white, black–white. How many times does it turn left?
  36. 36.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 15 and the right sensor reads 15. What does it do?     (a) turn right (b) go forward (c) turn left
  37. 37.⬛ A line follower runs:
    if (left sees black) { turn left } else if (right sees black) { turn right } else { go forward }
    It checks its sensors 4 times (left–right): black–white, white–white, white–black, white–black. How many times does it turn right?
  38. 38.⬛ A line follower runs:
    if (left sees black) { turn left } else if (right sees black) { turn right } else { go forward }
    It checks its sensors 5 times (left–right): white–black, white–white, white–black, black–black, white–white. How many times does it turn left?
  39. 39.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 55. What does it do?     (a) turn left (b) turn right
  40. 40.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 65 and the right sensor reads 30. What does it do?     (a) turn left (b) turn right (c) go forward

Answer key

  1. 0
  2. go forward
  3. left
  4. turn left
  5. turn left
  6. turn left
  7. lose the line
  8. it keeps fixing its path
  9. turn right
  10. turn left
  11. turn right
  12. turn left
  13. 1
  14. turn left
  15. go forward
  16. 1
  17. turn left
  18. turn right
  19. 1
  20. turn right
  21. turn left
  22. turn right
  23. 2
  24. go forward
  25. turn left
  26. 4
  27. 2
  28. go forward
  29. 2
  30. turn right
  31. 1
  32. turn right
  33. turn left
  34. turn left
  35. 2
  36. turn left
  37. 2
  38. 1
  39. turn left
  40. turn right

Free robotics lessons, practice and worksheets at talentjr.in/robotics-for-kids