Q. 14.3( 103 Votes )

The number of sig A. 5

B. 4

C. 2

D. 3

Answer :

Rules for Counting Significant Figures


(i) All the non-zero digits are significant. In 1.248, the


number of significant figures is 4.


(ii) All the zeroes between two non-zero digits are


significant, no matter where the decimal point is, if at


all. As examples, 406 and 9.001 have 3 and


4 significant figures respectively.


(iii) If the measurement of number is less than 1, the


zero(es) on the right of decimal point and to the left


of the first non-zero digit are non-significant.


In 0.00606, first three underlined zeroes are


non-significant and the number of significant figures


is only 3.


(iv) The terminal or trailing zero(es) in a number


without a decimal point are not significant. Thus,


12.3 =1230cm=12300 mm has only 3 significant


figures.


(v) The trailing zero(es) in number with a decimal point


are significant. Thus, 3.800 kg has 4 significant


figures.


(vi) A choice of change of units does not change the


number of significant digits or figures in a measurement.


So, here using rule (iii) and (v) we get, in 0.06900


-


0.06900 the underlined part is not significant and the bold part is significant.


Therefore, the number of significant figures is 4.

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