The respective number of signficant figures for the numbers `23.023, 0.0003 and 2.1 xx 10^(-3)` are

Options

A. `5,1,2`
B. `5,1,5`
C. `5,5,2`
D. `4,4,2`

Answer

A

Explanation

Rule: I We know all non zero digits are significant
Rule: II If zero is between two non-zero digits this is also significant.
Rule: III If zero left to the non-zero digit they are non-significant.
Significant figures for number 23.023 is 5. using I and II.
Significant figures for number 0.0003 is 1 . using I,II and III
Significant figure for number `2.1xx10^(-3)` is 2. using I