Scalars And Vectors

According to NCERT Class 11, Chapter 4 (Motion in a Plane), a scalar quantity is fully specified by its magnitude alone, while a vector quantity requires both a magnitude and a direction to be completely described. Displacement specifies how far and in which direction an object has moved from its starting point, so it is a vector. Speed is the magnitude of velocity without direction, making it a scalar. Distance is the total path length with no direction attached, hence a scalar. Time has only magnitude and flows in one sense for all observers, so it is also a scalar. Therefore displacement is the only vector among the choices. Plausibility check: a defining test of a vector is whether reversing direction changes the quantity meaningfully; reversing displacement gives the opposite vector, whereas reversing the sense of travel does not change speed, distance, or elapsed time, confirming displacement as the sole vector here.