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SEKOLAH MENENGAH KEBANGSAAN SERDANG

UJIAN BULAN OGOS - FIZIK TINGKATAN 4

MASA : 80 minit

ARAHAN : Kertas soalan ini mengandungi 15 soalan objektif dan 3 soalan struktur.

 Jawab semua soalan objektif dalam kertas jawapan objektif yang disediakan. Jawab semua soalan struktur dalam ruangan yang disediakan.

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15.

SOALAN STRUKTUR 

1. Diagram 1 shows a hydraulic jack used at a service centre.

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a) Name the physics principle involved in the hydraulic jack. [1m]

…………………………………………………………………………………………..

 b) A force of 120N is exerted on the small piston. The cross sectional area of the small piston and the large piston are 0.015 m2 and 0.78 m2 respectively.

i) Calculate the pressure at X.

[2m]

ii) What is the pressure at Y?

………………………………………………………………………………………………[1m]

iii) Determine the weight of the vehicle supported by the large piston.

[2m]

c) Explain one modification to the large piston that will enable the jack to lift a heavier 

load.

 ……………………………………………………………………………………………

[1m]

d) Name another device which also uses this principle.

……………………………………………………………………………………………

[1m]

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2. Diagram 6.1 and 6.2 shows situation of a canopy before a lorry moves and when the

lorry moves respectively.

a)(i) What is meant by pressure ? [1 m]

………………………………………………………………………………………….

ii) Compare the air pressure above and below the canopy when the lorry is moving.

………………………………………………………………………………………

[1m]

iii) Relate the speed of air to the pressure of air.

………………………………………………………………………………………

[1m]iv) Name the physics principle involved in question 2(a)(iii).

……………………………………………………………………………………..

[1m] b) Diagram 6.3 shows a venture tube filled with water where the two ends are closed by

stoppers. Diagram 6.4 shows water flowing through a horizontal tube with a constant

flow rate.

 Diagram 6.3 Diagram 6.4

i) Compare the speed of water at X, Y and Z in Diagram 6.4.

………………………………………………………………………………………[1m]

ii) Mark the water levels in tubes P, Q and R in Diagram 6.4. [1m]

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3. Diagram 7.1 shows an airplane taking off. When the airplane moves forward, the

difference in air pressure causes a resultant force that lifts the wings up as shown in

Diagram 7.2.

a)(i) Compare the air pressure above and below the wing in Diagram 7.2.

…………………………………………………………………………………………

[1m]

ii) Mark the low pressure region in Diagram 7.2 with a cross (X). [1m]

 b)(i) State the relationship between the speed of air flow and the air pressure.

………………………………………………………………………………………..

[1m]

ii) Name the principle involved in question 3(a)(i).

………………………………………………………………………………………..

[1m]

END OF QUESTION PAPER 

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Diagram 7.1 Diagram 7.2