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Q.

An orifice is present on the vertical wall of a water tank at a depth h below the free surface of water. When h = 4m, rate of flow of water through the orifice is 0.25 m3s. What will be the rate of flow of water when h = 9m?

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a

0.825 m3/s

b

0.625 m3/s

c

0.425 m3/s

d

0.375 m3/s

answer is D.

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Detailed Solution

If ‘a’ be the cross-sectional area of the orifice, then rate of flow Q=a2gh∴ Q∝h⇒Q1Q=h1h⇒Q10.25=94⇒Q1=0.375m3s
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