The velocity of efflux of an ideal liquid does not depend on: 

The area of two holes $A$and $B$are $2a$and $a$respectively. The holes are at height $\left(\frac{H}{3}\right)$ and $\left(\frac{2H}{3}\right)$ from the surface of the water. Find the correct option(s):

A cylindrical vessel of$90 \mathrm{cm}$height is kept filled up to the brim as shown in the figure. It has four holes $1, 2, 3, 4$which are respectively at heights of $20 \mathrm{cm}, 30 \mathrm{cm}, 40 \mathrm{cm}$ and $50 \mathrm{cm}$ from the horizontal floor $PQ.$ The water falling at the maximum horizontal distance from the vessel comes from

A solid sphere moves at a terminal velocity of $20 \mathrm{m} {\mathrm{s}}^{-1}$in air at a place where $g=9.8\mathrm{ }\mathrm{m} {\mathrm{s}}^{-2}$. The sphere is taken in a gravity free hall having air at the same pressure and pushed down at a speed of  $20\mathrm{ }\mathrm{m} {\mathrm{s}}^{-1}$.

A small iron ball falls from rest through a large height $h$ into a water column, the final velocity