Question

3 containers have diff. area on top surface and same base area . if equal volume of a liquid is put in them which will have more pressure at its base

Answer 1

The container which has narrowest surface area on the top, will have more depth in water or it is filled to a higher height.

Pressure on the base of container depends on the height as P = ρ g h

So the container with narrowest surface area on the top, will have maximum pressure on the bottom.