Question 73

Assume that the average volume of a raindrop is 10 cubic millimetres. A city spread in 10 km x 10 km received 1 cm of rain. The number of raindrops that fell on the city is

Solution

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Dimensions of city after rainfall = 10km x 10km x 1 cm

=> Volume = $$10^7\times10^7\times10$$ mm

= $$10^{15}$$ mm

Volume of raindrop = $$10$$ $$mm^3$$

$$\therefore$$ Number of raindrops = $$\frac{10^{15}}{10}=10^{14}$$

=> Ans - (D)

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