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63. A manometer connected to a closed tap reads

4.5×105  pascal. When the tap is opened the reading of the manometer falls to 4×105   pascal. Then the velocity of flow of water is

(a)  7  m/s                              (b)  8  m/s

(c)   9  m/s                              (d)  10  m/s

Answer-d

(42)

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