← Line-follower programs lesson New set →

Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 68 · 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 < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 60 and the right sensor reads 40. What does it do?     (a) turn left (b) turn right (c) go forward
  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 black and the right sensor sees black. What does it do?     (a) turn right (b) go forward (c) turn left
  3. 3.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 21. What does it do?     (a) turn left (b) turn right
  4. 4.⬛ 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) go forward (b) turn right (c) turn left
  5. 5.⬛ 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 40. What does it do?     (a) go forward (b) turn left (c) turn right
  6. 6.⬛ 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 left (c) 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 6 times (left–right): white–black, white–white, black–black, white–black, black–white, white–white. How many times does it turn left?
  8. 8.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) nowhere (b) right (c) left (d) backwards
  9. 9.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 55. What does it do?     (a) turn right (b) turn left
  10. 10.⬛ 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 80. What does it do?     (a) turn right (b) go forward (c) turn left
  11. 11.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 50 and the right sensor reads 55. What does it do?     (a) go forward (b) turn right (c) turn left
  12. 12.⬛ 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 15. What does it do?     (a) turn right (b) turn left (c) go forward
  13. 13.⬛ Why does a line follower wiggle a little as it drives? (a) its wheels are square (b) it is dancing (c) it keeps fixing its path (d) it is too cold
  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–black, black–black, white–black, white–white. How many times does it turn right?
  15. 15.⬛ 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) go forward (b) turn right (c) turn left
  16. 16.⬛ Going too fast round a sharp bend, a line follower may … (a) get heavier (b) grow wheels (c) lose the line (d) turn into a car
  17. 17.⬛ 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): black–white, black–black, black–white, black–white, black–black. How many times does it turn left?
  18. 18.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 35 and the right sensor reads 65. What does it do?     (a) go forward (b) turn right (c) turn left
  19. 19.⬛ 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) go forward (c) turn left
  20. 20.⬛ 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–black, white–black, white–black, white–white, white–black. How many times does it turn left?
  21. 21.⬛ 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 black. What does it do?     (a) turn left (b) go forward (c) turn right
  22. 22.⬛ 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 90. What does it do?     (a) turn right (b) turn left (c) go forward
  23. 23.⬛ 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) go forward (c) turn left
  24. 24.⬛ 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
  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 55. What does it do?     (a) turn right (b) turn left (c) go forward
  26. 26.⬛ 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 40. What does it do?     (a) turn right (b) go forward (c) 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 65 and the right sensor reads 75. What does it do?     (a) go forward (b) turn left (c) turn right
  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): white–white, white–white, black–black, white–black. How many times does it turn right?
  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 4 times (left–right): white–white, black–white, white–black, white–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 30 and the right sensor reads 35. 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 5 times (left–right): white–black, white–black, white–white, black–white, black–white. How many times does it turn left?
  32. 32.⬛ 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 10. What does it do?     (a) turn left (b) turn right (c) go forward
  33. 33.⬛ 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, white–white, white–white, black–black, black–black. How many times does it turn left?
  34. 34.⬛ 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 60. What does it do?     (a) turn right (b) turn left (c) go forward
  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 6 times (left–right): black–black, black–white, white–black, black–white, black–white, white–black. How many times does it turn left?
  36. 36.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 16. What does it do?     (a) turn left (b) turn right
  37. 37.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 35 and the right sensor reads 50. What does it do?     (a) turn left (b) go forward (c) 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): black–white, black–black, white–black, black–white, white–black. How many times does it turn right?
  39. 39.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 44. 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 20 and the right sensor reads 25. What does it do?     (a) turn left (b) go forward (c) turn right

Answer key

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

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