Pressure inside a Liquid and its Variation


 
 
Concept Explanation
 

Pressure inside a Liquid and its Variation

Pressure in liquids: Like solids, all liquids and gases (together called fluids), apply pressure. Unlike solids, the liquids do not have a definite shape. They take the shape of the containing vessel. Unlike solids the pressure in the liquids is not the thrust per unit area. It depends upon the depth (height) and the density of the liquid. Solids exert pressure on a surface due to their weight. Fluids also have weight. So, they also exert pressure on the base and walls of container in which they are enclosed. What happens when you fill a balloon with water? The walls of the balloon bulge outwards due to the pressure of the water inside. If you keep on filling water in the balloon, what do you think will happen? The balloon will burst because the pressure on the walls of the balloon will increase beyond what its walls can withstand.

Sample Questions
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Question : 1

A nurse applies the force of 3.8 N to the syringe's piston of radius 0.9 cm. Find the increase in pressure of the fluid in the syringe?

Right Option : A
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Question : 2

Two stretched membranes of area 2 sq cm and 3 sq cm are placed in a liquid at the same depth. The ratio of the pressure on them is:

Right Option : A
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Question : 3

Three identical vessels A, B and C contain same quantity of liquid. In each vessel, blocks with different densities but same masses are placed as shown in figure. If F_A,; F_B; and ; F_C are the total forces acting on the base of vessels A, B and C respectively, then

Right Option : A
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