Answer
a. $0.0005~A$
b. $0.425~A$
Work Step by Step
a. Since the measurement $0.0005~A$ has 1 significant digit, then its accuracy is $1$. This is the least accurate measurement, since the others have $2$ and $3$ significant digits.
b. The measurement $0.425~A$ has the precision $0.001$ which is the least precise, since the others have precisions of $0.0001$ and $0.00001$.
