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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 15 · 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 }
    The left sensor sees white and the right sensor sees white. What does it do?     (a) turn right (b) go forward (c) turn left
  2. 2.⬛ 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, black–white, white–white, white–white, black–white. How many times does it turn right?
  3. 3.⬛ 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–black, black–white, black–black, black–black, white–black. How many times does it turn right?
  4. 4.⬛ 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 black. What does it do?     (a) go forward (b) turn right (c) turn left
  5. 5.⬛ 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, black–black, white–white, black–black, black–black, white–black. How many times does it turn left?
  6. 6.⬛ 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–black, black–black, white–white, black–black, black–white. How many times does it turn right?
  7. 7.⬛ 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, white–white, white–black, white–white. How many times does it turn left?
  8. 8.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 40 and the right sensor reads 80. What does it do?     (a) turn left (b) go forward (c) turn right
  9. 9.⬛ 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 60. What does it do?     (a) turn right (b) go forward (c) turn left
  10. 10.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) left (b) backwards (c) right (d) nowhere
  11. 11.⬛ 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 black. What does it do?     (a) turn right (b) go forward (c) turn left
  12. 12.⬛ 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) turn right (b) turn left (c) go forward
  13. 13.⬛ A line follower runs:
    if (right sees black) { turn right } else if (left sees black) { turn left } else { go forward }
    The left sensor sees black and the right sensor sees white. What does it do?     (a) turn right (b) turn left (c) go forward
  14. 14.⬛ 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, white–white, black–black, black–black. How many times does it turn left?
  15. 15.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 33. What does it do?     (a) turn left (b) turn right
  16. 16.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 47. What does it do?     (a) turn right (b) turn left
  17. 17.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 76. What does it do?     (a) turn left (b) turn right
  18. 18.⬛ Why does a line follower wiggle a little as it drives? (a) it is too cold (b) its wheels are square (c) it keeps fixing its path (d) it is dancing
  19. 19.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 45. What does it do?     (a) turn left (b) turn right
  20. 20.⬛ 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
  21. 21.⬛ 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 60. What does it do?     (a) go forward (b) turn left (c) turn right
  22. 22.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 53. What does it do?     (a) turn left (b) turn right
  23. 23.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 68. What does it do?     (a) turn right (b) turn left
  24. 24.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 25 and the right sensor reads 30. What does it do?     (a) turn left (b) turn right (c) go forward
  25. 25.⬛ 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 70. What does it do?     (a) turn left (b) turn right (c) go forward
  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 4 times (left–right): white–black, white–black, black–black, white–white. How many times does it turn left?
  27. 27.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 40 and the right sensor reads 85. What does it do?     (a) turn left (b) turn right (c) go forward
  28. 28.⬛ 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–white, black–black, black–black. How many times does it turn left?
  29. 29.⬛ 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 10. What does it do?     (a) turn left (b) go forward (c) turn right
  30. 30.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 40. What does it do?     (a) turn left (b) turn right
  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 6 times (left–right): black–black, white–black, white–black, black–black, white–white, white–white. How many times does it turn right?
  32. 32.⬛ 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 50. What does it do?     (a) go forward (b) turn left (c) turn right
  33. 33.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 48. What does it do?     (a) turn right (b) turn left
  34. 34.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 19. What does it do?     (a) turn right (b) turn left
  35. 35.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 26. What does it do?     (a) turn right (b) turn left
  36. 36.⬛ 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–white, white–black, white–white, black–black, white–white. How many times does it turn left?
  37. 37.⬛ 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 25. What does it do?     (a) go forward (b) turn right (c) turn left
  38. 38.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 51. What does it do?     (a) turn right (b) turn left
  39. 39.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 33. 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 85 and the right sensor reads 20. What does it do?     (a) turn left (b) go forward (c) turn right

Answer key

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

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