Question 1
Measurement and UnitsWhich of the following represents the correct precision if the length of a piece of wire is measured with a metre rule?
- A.35 mm
- B.35.0 mm
- C.35.00 mm
- D.35.01 mm
Show the answer and explanation
Answer: A (35 mm)
Explanation
A metre rule's smallest division is 1 mm, so it can only measure to the nearest millimetre: 35 mm. Writing 35.0 mm or 35.00 mm would claim a precision the rule does not have.