What is the least possible error in using a rule graduated in centimeters?
A
0.1cm
B
0.5cm
C
1.0cm
D
2.0cm
Verified Correct Answer: B.
Physical Principles & Numerical Solution
A rule (ruler) graduated in centimeters has markings every 1 cm. The least possible error (also called the uncertainty or instrument error) is half the smallest division on the scale.
Smallest division = 1 cm
Least possible error = \(\frac{1}{2}\) \times 1 cm = 0.5 cm
Source: Myschool Past Questions Archive (Record #28037)