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
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a