66. An incompressible fluid flows steadily through a cylindrical pipe which has radius 2r at point A and radius r at B further along the flow direction. If the velocity at point A is v, its velocity at point B is
(a) 2v (b) v
(c) v/2 (d) 4v
Answer-d
(6)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)