TUTORIAL 3.2LIQUID PRESSURE

1. An air bubble is at a depth of 5 m below thesurface of a lake . What is the pressure ofwater on the bubble if the density of the

m-3?water is 1 000 kg

10-3A.

B. C. D.

5 x Pa22 x 10 Pa

5 x 10 Pa5 x 104 Pa

P = 1000 x 10 x5= 50 000 Pa

3

D

2. The figure shows a high tin with a length of100 cm is filled to the full with water.

If the pressure caused by the wateris 8000 Pa, What is the value of L?

at point P

- 3(Density of water = 1000 kg m )

A

B CD

10 cm

20 cm60 cm80 cm

8000 = 1000h= 0.8m = 80 cmL = 100 – 80 = 20cm

3. Which one of the following is not true?

A

BThe pressure in a liquid

The pressure in a liquid density of the water The pressure in a liquidcontact

The pressure in a liquid

increases

increaseswith

withdepth

C increases with area of

D increases with thegravitational acceleration

C

4. The figures show liquids in containers. Whichcolumn of liquid exerts the greatest pressureon the base of its container?

B

5. The figure shows a polystyrene block beingpushed to a depth of h cm from the watersurface. P is the water pressure acting onsurface Q. Which graph shows therelationship between P and h when the blockis pushed deeper into the water? (2005)

A

6. The figure shows three containers withdifferent shapes filled with water with thesame level. The pressure caused by the waterat point P , Qrespectively.

and R are P1 , P2 and P3

Which comparison is correct?A

B C

P1 > P2 > P3

P1 < P2 < P3

P1=P2 = P3 C

7. Equal masses of water are poured into fourjars as shown. In which jar is the pressureexerted by the water on the base thegreatest?

A

8. The figure shows three wooden blocks J,Kand L are pressed into the water until thebase of its reach at level P.

The pressure caused by the water at base ofthe wooden blocksX3 respectively.

Which comparison

J , K and L are X1 , X2 and

is correct?

A

B C

X1 > X2 > X3

X1 < X2 < X3

X1=X2 = X3

C

9. The figure shows a siphon system. Which ofthe following is true?

Water in beaker A flows into beaker B until the volume of water in beaker A is the same as the volume of water in beaker B

A

B Water inthe levelthe level

Water in

beaker A flows into beaker B untilof water in beaker A is the same asof water in beaker B

C beaker A flows into beaker B untilbeaker B is full

D Water in beaker A flows into beaker B untilbeaker B is empty

B

10. Diagram below shows the process ofsupplying water from a water tank on a hilla water tank X on a tall building.

Calculate the pressure of the water at X.

to

1000 kgm-3][Density of water = (2006)

x 105

x 105

x 105

x 105

m-2

m-2

m-2

m-2

A.

B. C.D.

1.4

1.62.63.0

N

N NN

A

11. Diagram below shows a fish in

What is the pressure exerted bythe

thesea.

water onthe fish? (2007)

000 kgm-3][water density = 1

10-3A.

B. C. D.

6 x Pa

6 x 101 Pa

6 x 103 Pa6 x 104 Pa

D

13. The wall of a dam is much thicker at thebottom than at the top because

A pressure of water at the upper level is higherthan pressure of water at the deeper level

pressure of water at the upper level is lower than pressure of water at the deeper level pressure of water at the upper level is thesame as than pressure of water at the deeperlevel

B

C

B

14. Diagram 7 shows two identical containerscontaining liquid P and liquid Q.

When the height of liquid P is 15 cm and the height of liquid Q is 20 cm, water spurt is the same. The density of liquid P is 2.0 g cm-3.What is the density of liquid Q? (2008)

cm-3

cm-3

cm-3

cm-3

A.

B.C.D.

0.67

1.301.502.70

g

ggg

C 15

15.Diagram 10 shows the water piping systemof a house. What is the water pressure in the

m-3

Pa.tap? Density of wateratmospheric pressure

==

1 000 kg and(2008)x 1051.0

8.0 x 103 Pa

5.8 x 104 Pa1.08 x 105 Pa1.58 x 105 Pa

A.

B.C.D.

D

16. Diagram 8 showsdiver in a sea. Theand U is PT , PS and

two divers in a lake and apressure of water at T, SPU respectively.

Which of the following comparisons is correctabout the pressure exerted on the divers?

A.

B.

C. D.

Pu

Pu

Pu

Pu

>

<==

PT

PT

PT

PT

>

<><

PS

PS

PS

PS

A

17. Diagram 9 shows water spurting out from acontainer at different depths. Which graphshows the correct relationship between thepressure exerted by the water, p and thedepth of the water, h?

A

Diagram 2.1 shows two different containersfilled with water. The water pressure at point Pand point Q are the same.

(a) What is the meaning of pressure? [1 mark]

Pressure is force per unit area.........................................................

1. Question 2: Kelantan 10

(b) State one factor that affect the waterpressure at point P and Q. [1 mark]

(c) Calculate the water pressure at point P.marks][Density of water = 1000 kgm-3] [2

1. Question 2: Kelantan 10

Depth of water

P = 1000 x 10 x 0.12 = 12000 Pa

(d) Diagram 2.2 shows the water spurt when a hole ismade near the base of container B.

Diagram 2.2 Diagram 2.3

Diagram 2.3 shows the water in container B isreplaced by liquid X which has higher density thanwater. Sketch the spurt of[1 mark]

liquid X in Diagram 2.3.

1. Question 2: Kelantan 10

ForceArea

Spm 2007

P = 1000 = 30 000 Pa

1- Pressure at Q is higherPQ > PP

2 -Depth at Q is higher

Spm 2007