State the no. of significant figures in the following measurements i) 0.020800m ii) 5.308N/m2 iii) 1.90×1011kg

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1,4,3

5,4,3

5,2,1

5,4,5

answer is B.

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Detailed Solution

i)0.020800→significant figures is 5 if the number is less than one , all the zeros to the right of the decimal point but to the left of the first non zero digit are not significant ii)5.308→significant figures is 4 all non zero digits in a given number are significant without any regard to the location of the decimal point if any iii)1.90×1011→significant figures 3 all non zero digits in a given number are significant without any regard to the location of the decimal point if any and all zeros to the right of the last non zero digit after the decimal point are significant

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