A. what is the samllest increment on the ruler?
The smallest scale division is a tenth of a centimeter or 1 mm.
B. what is the uncertain?
Uncertainty refers to epistemic situations involving imperfect or unknown information. It applies to predictions of future events, to physical measurements that are already made, or to the unknown. Uncertainty arises in partially observable or stochastic environments, as well as due to ignorance, indolence, or both.
