Answer: 12.30 mm.
- A 12.06 mm
- B 12.30 mm
- C 12.60 mm
- D 12.15 mm
Correct answer: B. 12.30 mm
Explanation: Least count = 1 mm - (19/20) mm = 0.05 mm. Reading = 12 mm + 6 × 0.05 mm = 12.30 mm.
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.