What is the difference between a vector and a scalar?

Question

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

Answer 1

The correct answer is:

c: A vector measurement contains a direction and magnitude, a scalar measurement only contains a magnitude.

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