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Units And Measurement

Question
CBSEENPH11016722

State the number of significant figures in the following : (a) 0.007 m (b) 2.64 cross times space 10 to the power of 24 kg (c) 0.2370 g cm-3 d) 6.320 J e)   6.032 N m-
f)  0.0006032 m2

Solution
The number of significant figures are: 
(a) One (b) Three (c) Four d) Three e) Four f) seven