AS Level Density & Pressure

Question 1

The graph shows how the pressure exerted by a liquid varies with depth below the surface.
What is the density of the liquid?

Accepted Answer

B 760 kg.m^–3

Answer

A 600 kg.m^–3

Answer

C 5900 kg.m^–3

Answer

D 7500 kg.m^–3

Question 2

An object, immersed in a liquid in a tank, experiences an upthrust. 
What is the physical reason for this upthrust?

Accepted Answer

C The pressure in the liquid increases with depth.

Answer

A The density of the body differs from that of the liquid.

Answer

B The density of the liquid increases with depth.

Answer

D The value of 'g 'in the liquid increases with depth.

Question 3

The diagram shows two liquids, labelled P and Q, which do not mix. The liquids are in equilibrium in an open U-tube.
What is the ratio density of P/ density of Q?

Accepted Answer

A 1/2

Answer

B 2/3

Answer

C 3/2

Answer

D 2

Question 4

A submarine is in equilibrium in a fully submerged position.
What causes the upthrust on the submarine?

Accepted Answer

D There is a difference in water pressure acting on the top and bottom of the submarine.

Answer

A What causes the upthrust on the submarine?

Answer

B The sea water exerts a greater upward force on the submarine than the weight of the steel.

Answer

C The submarine displaces its own volume of sea water.

Question 5

The diagram represents a sphere under water. P, Q, R, and S are forces acting on the sphere, due to the pressure of the water.
Each force acts perpendicularly to the sphere’s surface. P and R act in opposite directions vertically. Q and S act in opposite directions horizontally. 
Which information about the magnitudes of the forces is correct?

Accepted Answer

A P < R ; S = Q

Answer

B P > R ; S = Q

Answer

C P = R ; S = Q

Answer

D P = R = S = Q

Question 6

The density of mercury is 13.6 × 10^3 kg.m^–3.
The pressure difference between the bottom and the top of a column of mercury is 100 kPa. 
What is the height of the column?

Accepted Answer

A 0.75 m

Answer

B 1.3 m

Answer

C 7.4 m

Answer

D 72 m

Question 7

A rectangular metal bar exerts a pressure of 15 200 Pa on the horizontal surface on which it rests. 
If the height of the metal bar is 80 cm, what is the density of the metal?

Accepted Answer

B 1900 kg.m^–3

Answer

A 190 kg.m^–3

Answer

C 19 000 kg.m^–3

Answer

D 190 000 kg.m^–3

Question 8

Liquids X and Y are stored in large open tanks. Liquids X and Y have densities of 800 kg.m^–3 and 1200 kg.m^–3 respectively. 
At what depths are the pressures equal?

Accepted Answer

C depth of liquid X = 15 m; depth of liquid Y = 10 m

Answer

A depth of liquid X = 8 m; depth of liquid Y = 12 m

Answer

B depth of liquid X = 10 m; depth of liquid Y = 10 m

Answer

D depth of liquid X = 18 m; depth of liquid Y = 8 m

Question 9

Why does an ideal gas exert pressure on its container?

Accepted Answer

B The molecules of the gas collide continually with the walls of the container.

Answer

A The molecules of the gas collide continually with each other.

Answer

C The molecules of the gas collide inelastically with the walls of the container.

Answer

D The weight of the molecules exerts a force on the walls of the container.

Question 10

The diagram shows a flask connected to a U-tube containing liquid. The flask contains air at atmospheric pressure.
The flask is now gently heated and the liquid level in the right-hand side of the U-tube rises through a distance h. The density of the liquid is ρ. 
What is the increase in pressure of the heated air in the flask?

Accepted Answer

A hρ

Answer

B ½ hρg

Answer

C hρg

Answer

D 2hρg

Question 11

In the kinetic model of gases, what is pressure equal to?

Accepted Answer

D the force exerted by the atoms hitting and rebounding from a unit area of the gas container surface

Answer

A the number of atoms hitting and rebounding from a surface of the gas container.

Answer

B the number of atoms hitting and rebounding from a unit area of the gas container surface.

Answer

C the force exerted by the atoms hitting and rebounding from a surface of the gas container.

Question 12

An object, immersed in a liquid in a tank, experiences an upthrust. 
What is the physical reason for this upthrust?

Accepted Answer

C The pressure in the liquid increases with depth.

Answer

A The density of the body differs from that of the liquid.

Answer

B The density of the liquid increases with depth.

Answer

D The value of g in the liquid increases with depth.

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AS Level Density & Pressure

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