Q.

Given the numbers : 161 cm, 0.161 cm, 0.0161 cm. The number of significant figures for the three numbers are

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a

3, 4 and 5 respectively

b

3, 3 and 3 respectively

c

3, 3 and 4 respectively

d

3, 4 and 4 respectively

answer is B.

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Detailed Solution

All non zero digits are significant ;   Ex: In  161cm , the number of  S.f = 3                                                                                  In 0.161cm , the  number of  S.f = 3Zeros preceding to first non zero digit are not significant;  ex: In 0.0161cm, the number of  S.f = 3(S.f= significant figures)
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Given the numbers : 161 cm, 0.161 cm, 0.0161 cm. The number of significant figures for the three numbers are