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13. A cylindrical tank has a hole of 1 cm2 in its bottom. If the water is allowed to flow into the tank from a tube above it at the rate of

70 cm3/sec. then the maximum height up to which water can rise in the tank is

(a)   2.5 cm                                        (b)  5 cm

(c)   10 cm                                          (d)  0.25 cm

Answer-a

(23)

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