Lesson 7 · Detecting Intersections — Knowledge Checks

Which condition detects an intersection (both sensors on the line)?

1. A.left > 0.5 or right > 0.5
2. B.left > 0.5 and right > 0.5
3. C.left > 0.5
4. D.not (left > 0.5)

Answer Why?

Why is there a time.sleep(0.3) right after the robot turns at the cross?

1. A.To let the motors cool down
2. B.So the robot moves past the cross before the loop checks again — otherwise it re-detects the same cross instantly
3. C.To make the turn more accurate
4. D.It is required by arcade()

Answer Why?

During normal line following (not at a cross), which branch of the if/else runs?

1. A.The if branch — it turns around
2. B.The else branch — it does proportional line following
3. C.Both branches run
4. D.Neither runs

Answer Why?