Question

A closed vessel is half filled with water. There is a hole near the top of the vessel and air is pumped out from this hole.
(a) The water level will rise up in the vessel.
(b) The pressure at the surface of the water will decrease.
(c) The force by the water on the bottom of the vessel will decrease.
(d) The density of the liquid will decrease.

Answer 1

(b) The pressure at the surface of the water will decrease.

(c) The force by the water on the bottom of the vessel will decrease.