Can a liquid exert pressure upwards?

Where is the pressure greater, 10m below the surface of the sea or 20m below the surface of sea?

What force acting on, an area of 0.5 m ² will produce a pressure of 500 Pa?

Can a liquid exert pressure sideways?

State whether the following statements are true or false :

(a) The pressure exerted by a liquid depends on the area of base of its container.

(b) A drinking straw works on the pressure exerted by the liquid filled in a soft drink bottle in which it is placed.