KVPY 2019 SA Exam Previous Papers

Question : 28 of 80

Marks: +1, -0

Mumbai needs 1.4 × 10

^{12}

litres of water annually. Its effective surface area is 600 km

^{2}

and it receives an average rainfall of 2.4 m annually. If 10% of this rain water is conserved it will meet approximately :

Solution:

Volume of water received from rain =

V = 600 × 106 × 2.4 ×10/100

V = 1440 × 10^5 m^3

% of needed water =

{1440 ×10 ^5}/{1.4× 10^12}×100≈10%

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