← Line-follower programs lesson New set →

Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 188 · 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 (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) go forward (b) turn right (c) turn left
  2. 2.⬛ Going too fast round a sharp bend, a line follower may … (a) turn into a car (b) lose the line (c) get heavier (d) grow wheels
  3. 3.⬛ 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) go forward (b) turn right (c) turn left
  4. 4.⬛ 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 left (b) turn right (c) go forward
  5. 5.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) right (b) nowhere (c) backwards (d) 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 4 times (left–right): white–white, black–white, white–black, black–white. How many times does it turn left?
  7. 7.⬛ Why does a line follower wiggle a little as it drives? (a) it is dancing (b) its wheels are square (c) it is too cold (d) it keeps fixing its path
  8. 8.⬛ 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 left (b) go forward (c) turn right
  9. 9.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 5. What does it do?     (a) turn left (b) turn right
  10. 10.⬛ 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 left (b) turn right (c) go forward
  11. 11.⬛ 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 45. What does it do?     (a) go forward (b) turn left (c) turn right
  12. 12.⬛ 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 30. What does it do?     (a) turn left (b) go forward (c) turn right
  13. 13.⬛ 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
  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 5 times (left–right): black–white, white–white, white–black, white–white, white–black. How many times does it turn left?
  15. 15.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 80. What does it do?     (a) turn left (b) turn right
  16. 16.⬛ 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 65. What does it do?     (a) turn right (b) go forward (c) turn left
  17. 17.⬛ 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 35. What does it do?     (a) turn right (b) turn left (c) go forward
  18. 18.⬛ 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 35. 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 }
    It checks its sensors 6 times (left–right): white–white, white–black, black–white, black–black, white–white, white–white. How many times does it turn left?
  20. 20.⬛ 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 80. What does it do?     (a) go forward (b) turn left (c) 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 39. What does it do?     (a) turn right (b) turn left
  22. 22.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 75 and the right sensor reads 90. What does it do?     (a) turn left (b) go forward (c) 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 37. What does it do?     (a) turn right (b) turn left
  24. 24.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 46. What does it do?     (a) turn right (b) turn left
  25. 25.⬛ 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–white, white–black, black–white. How many times does it turn left?
  26. 26.⬛ 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 right (b) turn left (c) go forward
  27. 27.⬛ 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 left (b) 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 25 and the right sensor reads 20. What does it do?     (a) turn right (b) turn left (c) go forward
  29. 29.⬛ 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) turn right (b) go forward (c) turn left
  30. 30.⬛ 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 70. What does it do?     (a) turn left (b) go forward (c) turn right
  31. 31.⬛ 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 left (b) turn right (c) go forward
  32. 32.⬛ 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–white, white–white. How many times does it turn left?
  33. 33.⬛ 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 35. What does it do?     (a) turn left (b) turn right (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 75 and the right sensor reads 35. What does it do?     (a) go forward (b) turn right (c) turn left
  35. 35.⬛ 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 25. What does it do?     (a) turn left (b) turn right (c) go forward
  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 6 times (left–right): black–white, white–white, white–white, white–white, black–white, white–white. How many times does it 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 5 times (left–right): white–black, white–white, black–white, white–black, white–black. How many times does it turn right?
  38. 38.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 66. What does it do?     (a) turn left (b) turn right
  39. 39.⬛ 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 45. What does it do?     (a) turn right (b) turn left (c) go forward
  40. 40.⬛ 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

Answer key

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

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