Which of the following is a scalar quantity?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Mass
A scalar quantity has magnitude only, while a vector has both magnitude and direction. Mass is fully described by a number and a unit, such as 5 kg, so it is a scalar.
Why the other options are incorrect
Option (2) Displacement — Incorrect. Displacement is the shortest distance in a stated direction, so it is a vector.
Option (3) Velocity — Incorrect. Velocity is speed in a given direction, so it is a vector.
Option (4) Acceleration — Incorrect. Acceleration is the rate of change of velocity and has a direction, so it is a vector.