Skip to main content
Module 3 · Grid Driving

Lesson 2 · Driving Multiple Intersections — Knowledge Checks

Name Date

  1. Why does a second track_until_cross() call right after the first do nothing?

    1. A.The method can only be called once
    2. B.The robot is still on the intersection, so is_at_cross() is already true and the loop exits immediately
    3. C.The battery needs a rest
    4. D.You must call turn_right() in between

    Answer Why?

  2. In a loop that drives 3 intersections, why is the clear step skipped on the last iteration?

    1. A.To save battery
    2. B.So the robot stops ON the final intersection instead of driving past it
    3. C.Because clearing only works twice
    4. D.It is a mistake — you should always clear

    Answer Why?

  3. A student's loop clears after EVERY intersection, including the last. What goes wrong?

    1. A.Nothing — it works fine
    2. B.The robot drives past the final intersection instead of stopping on it
    3. C.The robot never moves
    4. D.It turns instead of driving

    Answer Why?