Answer: 2.
- A 2
- B 3
- C 4
- D 5
Correct answer: A. 2
Explanation: Leading zeros are never significant; they only locate the decimal point. Only the digits 2 and 5 are significant, so there are 2 significant figures.
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.