What is the difference between a vector and a scalar?

Question

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

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 a magnitude and a direction (e.g., velocity, force), while scalars are quantities that only have a magnitude (e.g., mass, temperature).