Question

The respective number of significant figures for the numbers 23.023, 0.0003 and 2.1 x 10-3 are

(a) 5, 1,2

(b) 5, 1,5

(c) 5,5,2

(d) 4,4,2

Answer 1

Correct option (a) 5, 1,2

Explanation :

The reliable digit plus the first uncertain digit is known as significant figures.

For the number 23.023, all the non-zero digits are significant. hence 5.

For the number 0.0003, number is less than 1, the zero(*) on the right of decimal point but to the left of the first non-zero digit are not significant, hence 1.

For the number 2.1 x 10-3, significant figures are 2.