What is the difference between a vector and a scalar?

Question

a
A vector measurement is required for distance, a scalar measurement is required for displacement
b
A vector measurement contains a direction and magnitude, a scalar measurement only contains a magnitude
c
A vector is only used in measuring forces, a scalar is only used in measuring mass
d
A vector is only measured in SI units, where scalars are only measured in US Customary units

Answer 1

The correct answer is:

b - A vector measurement contains a direction and magnitude, a scalar measurement only contains a magnitude.

Vectors are quantities that have both size (magnitude) and direction (such as velocity and force), while scalars only have size (such as temperature or mass) without any directional component.