• # question_answer Given $P=0.0030m$, $Q=2.40m$, $R=3000m$, Significant figures in $P,\,Q$ and $R$ are respectively           [Pb. CET 2002] A)                 2, 2, 1     B)                 2, 3, 4 C)                 4, 2, 1     D)                 4, 2, 3

Solution :

Given$P=0.0030m$, $Q=2.40m$ & $R=3000m$ in $P(0.0030)$ initial zeros after the decimal point are not significant. Therefore, significant figures in $P(0.0030)$ are 2. Similarly in $Q(2.40)$ significant figures are 3 as in this case final zero is significant. In $R=(3000)$ all the zeroes are significant hence, in $R$ significant figures are 4.

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