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10. A large tank filled with water to a height ‘h’ is to be emptied through a small hole at the bottom. The ratio of time taken for the level of water to fall from h to h/2 and from h/2 to zero is

(a) √2                                  (b) 1/ √2

(c) √2 -1                               (d) 1/(√2 -1 )

Answer-c

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