The annual rainfall at a place is 40 cm. The weight of water is 1 metric tonne per cubic meter. What is the weight of water (in metric tonnes) of annual rainfall falling there on a hectare of land?
A.40
B.400
C.4000✓ Correct
D.40000
Explanation
Volume of rainfall per hectare is 4000 cubic metres (from 10,000 m² × 0.4 m). Since 1 m³ of water weighs 1 metric tonne, weight = 4000 × 1 = 4000 metric tonnes.
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