Answer: 7.
- A 5
- B 6
- C 7
- D 9
Correct answer: C. 7
Explanation: The SI system has 7 base units: metre, kilogram, second, ampere, kelvin, mole, and candela.
The 7 SI base units. All derived units (newton, joule, watt, volt, etc.) can be expressed as combinations of these 7 fundamental units raised to various powers.
Concept context
SI base units, dimensional analysis, significant figures, and error propagation. The toolkit every physics calculation relies on.