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The seven SI base units are called base units for which reason?
ANone can be built from the other six
BEach is used more often than others
CThey were the first units measured
DThey all describe a length somehow
Answer & Solution
Correct answer: A. None can be built from the other six
1. Every physical quantity has a unit, and all units can be built from a small starting set.
2. Those starting units are called base units because none of them can be expressed as combinations of the other six.
3. They work like the letters of an alphabet, and every other unit is a word built from them.
_Source: Siyavula Physical Sciences Grade 10 (Everything Science, CC BY 4.0), Chapter 1: Skills for science_
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