Question

Which of the following statements are true about measurements and units?

Answer 1

A. In the SI system, unit prefixes are used to indicate powers of ten --> TRUE
The prefixes are used to indicate powers of ten: examples are kilo (k), which indicates $10^3$, or mega (M), which indicates $10^6$.

B. The unit of length in the SI system is the meter --> TRUE
Lengths are measured in meters in the SI system.

C. Measurements must include both numbers and units --> TRUE
Every measurement must include the number and the unit. Example: for a length, we must write L=10.0 m, where 'm' refers to 'meters'.

D. The SI unit system is used only in Asia --> FALSE
The SI system is used in the whole world.