Question

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

A. In the SI system, unit prefixes are used to indicate powers of ten.
B. The unit of length in the SI system is the meter
C. Measurements must include both numbers and units
D. The SI unit system is used only in Asia

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.