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Air is compressible and liquid is incompressible.

• True

• False

If an object is compressible it can be squeezed to fit into a smaller space than it normally does.

• True

• False

The figure shows connected tubes with a horizontal base. If water is poured gradually, the height of the water in the branches A, B, and C at equilibrium is ______.

• $h_A=h_B=h_C$

• $h_B>h_C>h_A$

• $h_B=h_A<h_C$

• $h_B<h_C<h_A$

Three beakers 1, 2 and 3 of different shapes are kept on a horizontal table and filled with water up to a height h. If the pressure at the base of the beakers are  $P_1$ , $P_2$ and $P_3$ respectively, which one of the following will be the relation connecting the three?

•  $P_1>P_2>P_3$  

•  $P_1<P_2<P_3$  

•  $P_1=P_2=P_3$  

•  $P_1>P_2<P_3$  

Recall that Liquid pressure depends on the depth below the surface and also depends on the density of the fluid.

Sea water is denser than Lake water.

Fish X is above Fish Y in the Lake water.

Fish Z is at the same depth as Fish Y but Fish Z is in the Sea water.

The pressure of water exerted on the fishes is P_X, P_Y and P_Z respectively.

Which comparison is correct about the pressure of water exerted on the fishes?

• P_Z > P_Y > P_X

• P_Z = P_Y

• P_X > P_Y

• P_Z < P_X < P_Y

Calculate the pressure exerted by the water on the fish.

[Density of water = 1 000 kg m⁻³ and g = 10N/kg]

• 5 × 10⁴ Pa

• 5 × 10⁷ Pa

• 5 × 10⁶ Pa

• 5 × 10^-1 Pa

Which of the following diagrams shows the best design for the wall of a reservoir?

• A
• B
• C
• D

Four different liquids are poured into identical measuring cylinders. The diagrams show the depths of the liquids and their densities.

Which liquid causes the largest pressure on the base of its measuring cylinder?

• A

• D

• C

• B

Which of the following factors affect the pressure at the bottom of a container of liquid?

• depth of the container

• width of the container

• temperature of liquid

• color of liquid

The pressure exerted by a liquid

• increases with depth.

• decreases with depth.

• is constant

• first increases and then decreases.