Perform the following calculations upto proper number of significant figures :
(i) `(1.20 xx 10^(-6)) + (6.00 xx 10^(-5))=?`
(ii) `(2.164 xx 10^(5))^(1//2)=?`
(iii) `(9.13 xx 10^(-2))(7.006 xx 10^(-3))=?`
(iv) `4.00 xx 10^(-2) + 3.26 xx 10^(-3) +1 xx 10^(-6)=?`

Answer

A, B, C, D

Explanation

(i) `(1.20 xx 10^(-6)) + (6.00 xx 10^(-5))`
`0.120 xx 10^(-5) + 6.00 xx 10^(-5) = 6.12 xx 10^(-5)`
(upto second place of decimal as in `6.00 xx 10^(-5)`)
(ii) `(2.164 xx 10^(5))^(1//2) =(21.64 xx 10^(4))^(1//2) = 4.6519 xx 10^(3)`
`=4.652 xx 10^(2)` (upto 3 significant figures)
(iv) `4.00 xx 10^(-2) + 3.26 xx 10^(-3) + 1 xx 10^(-6)`
`4.33 xx 10^(-3)` (upto second place of decimal).