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Question

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


A

5,1,2

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B

5,1,5

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C

5,5,2

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D

4,4,2

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Solution

The correct option is A

5,1,2


Explanation for correct option

Significant figures: Significant figures are the numbers of digits in a value, that contribute to the degree of accuracy of the value.

Rules for significant figures are :

All non-zero numbers are significant figures.

Zeros between two non-zero digits are significant.

All zeros to the right of decimal point and to the left of non-zero digit are not significant.

All zeros to the right of decimal are significant only if a non-zero digit does not follow them.

All zeros to the right of non-zero digit after the decimal point are significant.

So, in 23.023number of significant figures are 5

In 0.0003 number of significant figure is 1

And in 2.1×10-3 number of significant figures are 2

Hence, the correct option is option(A) i.e. 5,1,2


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