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

Answer 1

The correct answer is:

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

Vectors are quantities that have both a magnitude (size) and a direction, such as velocity or force. Scalars are quantities that only have a magnitude, such as temperature or mass.