1.

How many significant numbers are there in  (2.30 + 4.70) × 105 ? (a) 3             (b) 4             (c) 2             (d) 5

Answer»

(a) 3 

Explanation:

 (2.30 + 4.70) × 105 = (7.00) × 105 

Trailing zeros in a number containing decimal point are significant also  power of 10 doesn’t add to significant figure 

 Hence number of significant figure = 3   



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