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11. Two communicating vessels contain mercury. The diameter of one vessel is n times larger than the diameter of the other. A column of water of height h is poured into the left vessel. The mercury level will rise in the right-hand vessel (s = relative density of mercury and ρ= density of water) by

(a) (n²h)/[(n+1)²s] (b) h/[(n+1)²s]

(c) h/[(n² +1)s] (d) h/(n² s)

Answer-b

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PrevPrevious10. There are two identical small holes of area of cross-section a on the opposite sides of a tank containing a liquid of density ρ . The difference in height between the holes is h. Tank is resting on a smooth horizontal surface. Horizontal force which will has to be applied on the tank to keep it in equilibrium is

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