Numerical Problem No. 1.9 (Physical Quantities and Measurements) Physics SSC - I (Class 9)

What are the significant figures in the following measurements? 

(a) 1.009 m                       (b) 0.00450 kg 

(c) 1.66 ｘ 10⁻²⁷ kg            (d) 2001 s 

Ans. {(a) 4 (b) 3 (c) 3 (d) 4}

Ans:  

(a) 1.009 m  

This digit has 4 significant figures

(b) 0.00450 Kg 

This digit has 3 significant figures

(c) 1.66 ｘ 10⁻²⁷ kg  

= 0.00000000000000000000000000166 Kg

This digit has 3 significant figures

(d) 2001 s   

This digit has 4 significant figures

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