Nama: …………………………………………… Kelas: ……………………

[Lihat sebelah 4531/2 ©2005 Hak Cipta Bahagian Pendidikan & Latihan (Menengah) MARA SULIT

MAKTAB RENDAH SAINS MARA

PEPERIKSAAN PERCUBAAN

SIJIL PELAJARAN MALAYSIA 2005

FIZIK

Kertas 2

Dua jam tiga puluh minit

JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU

Untuk Kegunaan Pemeriksa

Bahagian Soalan Markah Penuh

Markah Diperoleh

1 4 2 5 3 6 4 7 5 8 6 8 7 10

A

8 12 1 20 B

2 20 3 20 C

4 20

1. Tuliskan nama dan kelas anda pada ruang yang disediakan.

2. Kertas soalan ini adalah dalam

dwibahasa. 3. Soalan di halaman kiri adalah

dalam bahasa Melayu. Soalan di halaman kanan adalah yang sepadan dalam bahasa Inggeris.

4. Calon dibenarkan menjawab

keseluruhan atau sebahagian soalan sama ada dalam bahasa Melayu atau bahasa Inggeris.

5. Calon dikehendaki membaca

maklumat di halaman 2 atau halaman 3.

Jumlah

Kertas soalan ini mengandungi 63 halaman bercetak dan 1 halaman tidak bercetak

SULIT 4531/2 Fizik Kertas 2 September 2005

2½ jam

4531

2

4531/2

SULIT 3 4531/2

4531/2 SULIT

INFORMATION TO CANDIDATES 1. This question paper consists of three sections: Section A, Section B and Section C.

2. Answer all questions in Section A. Write your answers for Section A in the spaces

provided in the question paper. 3. Answer one question from Section B and one question from Section C. Write your

answers for Section B and Section C on the lined pages at the end of this question paper. Answer questions in Section B and Section C in detail. You may use equations, diagrams, tables, graphs and other suitable methods to explain your answer.

4. Show your working. It may help you to get marks. 5. If you wish to cancel any answer, neatly cross out the answer. 6. The diagrams in the questions provided are not drawn to scale unless stated. 7. A list of formulae is provided on page 5. 8. The marks allocated for each question or part question are shown in brackets. 9. The time suggested to complete Section A is 90 minutes, Section B is 30 minutes and

Section C is 30 minutes. 10. You may use non-programmable scientific calculator. 11. Hand in all your answer sheets at the end of the examination.

Lihat sebelah

SULIT 5 4531/5

4531/2 SULIT

The following information may be useful. The symbols have their usual meaning.

1.

tuva −

=

2. asuv 222 += 3. 2

21 atuts +=

4. Momentum = mv 5. maF =

6. Kinetic energy = 2

21 mv

7. Potential energy = mgh

8.

9.

Elastic potential energy = 2

21 mv

Vm

=ρ

10. Pressure, AFP =

11. Pressure, ghP ρ= 12. Heat, θmcQ =

13. =TpV constant

14. 2mcE = 15. λfv =

16. Power, time

EnergyP =

17. vuf111

+=

18. Dax

=λ

19. rin

sinsin

=

20. n = real depth apparent depth

21. ItQ =

Fx

Ns = Vs NP VP

22. IRV =

25. Power, IVP = 26. 25. Efficiency = IS VS x 100%

IP VP

26. g = 10 m s-2

Lihat sebelah

SULIT 7 4531/2

4531/2 Lihat sebelah SULIT

Section A

[ 60 marks ]

Answer all questions in this section

The time suggested to complete this section is 90 minutes.

1 The Figure 1.1 shows a manometer which can be used to measure gas pressure.

FIGURE 1.1

(a) (i) Name the liquid X.

………………..……………………………………………………..……….. [1 mark]

1(a)(i)

(ii) Give the reason for your answer in (a)(i).

……………………………………………………………………………….. [1 mark]

1(a)(ii)

Manometer

Gas tap closed

Rubber tube

Metre rule

Liquid X

For Examiner’s

Use

SULIT 9 4531/2

Lihat sebelah

4531/2 SULIT

(b) The gas tap is opened so that gas can flow to the rubber tube into the manometer.

(i) On Figure 1.2, draw the levels of the liquid in both arms of the manometer. ……………………………………………………………………………...

[1 mark]

1(b)(i)

(ii) Explain why the levels of liquid X are as drawn in Figure 1.2. …………………………………………………………………………….

[1 mark]

1(b)(ii)

Total

Manometer

Gas tap opened

Rubber tube

Meter rule

FIGURE 1.2

For Examiner’s

Use

SULIT 11 4531/2

Lihat sebelah

4531/2 SULIT

2

Figure 2 shows a graph of activity against time for Iodine-131 for determining the half-life of the radioactive substance.

(a) What is meant by the term half-life ? ……………………………………………………………………………………..

[1 mark]

(b) Why is the activity of Iodine-131 gradually decreasing? ……………………………………………………………………………………..

[1 mark]

(c) Sodium-24 takes 75 days to decay from 160 g to 5 g. Calculate the half-life of the radioisotope.

[2 marks]

(d) Name one application of radioisotopes in medicine. ……………………………………………………………………………………..

[1 mark]

3 Rajah 3.1 menunjukkan susunan radas satu eksperimen untuk menentukan ketumpatan

Activity / Count minute -1

C

2C

0 8 16 Time / day

FIGURE 2

Untuk Kegunaan Pemeriksa

Total

For Examiner’s

Use

2(a) 2(b) 2(c) 2(d)

SULIT 13 4531/2

4531/2 SULIT

3

Figure 3.1 shows the set-up for an experiment to determine the density of the solid P. Figure 3.2 shows the reading of the balance and the water level when the P is immersed in water.

(a) (i) What is meant by the term ? …………………………………………………………………………..

[1 mark]

(ii) What is the volume of the solid P ? …………………………………………………………………………..

[1 mark]

(iii) Calculate the density of the solid P .

[2 marks]

FIGURE 3.2

750 g

150 cm3

P

FIGURE 3.1

100 cm3

P

200 g

For Examiner’s

Use

3 (a)(i) 3 (a)(ii) 3 (a)(iii)

Lihat sebelah

SULIT 15 4531/2

4531/2 SULIT

The solid material P is converted into small solid spheres that can be used to create a simple hydrometer as shown in Figures 3.3 and 3.4.

(b) (i) Compare the densities of liquid X and liquid Y. ………………………………………………………………………………..

[1 mark]

(ii) Compare the upthrust experienced by the simple hydrometer in Figures 3.3 and 3.4. ……………………………………………………………………………….

[1 mark]

FIGURE 3.3

Liquid X Liquid Y

FIGURE 3.4

Spheres from solid P

Test tube

For Examiner’s

Use

3(b)(i) 3(b)(ii) TOTAL

Lihat sebelah

SULIT 17 4531/2

4531/2 SULIT

4

.

Figure 4.1 shows silicon atoms, each with four valence electrons in its outermost shell.

(a) (i) What is meant by doping ?

………………………………………………………………….…………… [1 mark]

(ii) Mark ( √ ) for the type of element needed during doping to produce a p-type semiconductor in the box provided below. Trivalent Pentavalent

[1 mark ]

(iii) Name the majority charge carrier in the p-type semiconductor …………………………………………………………………….…………

[1 mark]

(b) Figure 4.2 shows a circuit containing a transistor which functions as an automatic switch. Bulb M will light up if the potential difference across XY exceeds 3.6 V

FIGURE 4.1

Si Si

SiSi

X

Y

Z

P 10 kΩ

LDR

Bulb M

FIGURE 4.2

6 V

For Examiner’s

Use

4(a)(i) 4(a)(ii) 4(a)(iii)

Lihat sebelah

SULIT 19 4531/2

Lihat sebelah

4531/2 SULIT

(i) What is the potential difference across YZ when the resistance of the

Light Dependent Resistor (LDR) is 20 kΩ ?

[ 2 marks ]

(ii) What happens to bulb M ?

………………………………………………………………………

[ 1 mark ]

(iii) Give a reason for your answer in (b) (ii) ………………………………………………………………………

[ 1 mark ]

For Examiner’s

Use 4(b)(i) 4(b)(ii) 4(b)(iii) Total

SULIT 21 4531/2

Lihat sebelah

4531/2 SULIT

5 Figure 5.1 shows a student jumping from a certain height towards the floor which

resulted in a leg injury. Figure 5.2 shows a broken egg when it is dropped from a certain height.

(a) Describe the change in the velocity of the egg and the student while moving in the air. ………………………………………………………………………………………

[1 mark]

(b) Based on Figures 5.1 and 5.2 identify one physical quantity that causes injury to the student and breaks the egg. ………………………………………………………………………………….…

[1 mark]

(c) Suggest a method that would have :

(i) reduced injury to the student’s leg.

.………………………………………………………………………..…… [1 mark]

(ii) prevented the egg from breaking.

………….…………………………………………………………………… [1 mark]

FIGURE 5.1 FIGURE 5.2

Egg

Broken egg

For Examiner’s

Use

5(a) 5(b) 5(c)(i) 5(c)(ii)

SULIT 23 4531/2

4531/2 SULIT

(d) Explain why the methods you suggested in (c) (i) and (c) (ii) can help avoid leg

injury and the broken egg. ………………………………………………………………………………….……

[1 mark]

(e) State the relationship between the answers in (b) and (d). ………………………………………………………………………………….……

[1 mark]

(f) Use the relationship in (e) to explain why a ball with a low air pressure does not travel far when kicked. ………………………………………………………………………………….…… ………………………………………………………………………………….……

[2 marks]

5(d) 5(e) 5(f) Total

For Examiner’s

Use

Lihat sebelah

SULIT 25 4531/2

4531/2 SULIT

6

. The frequencies of sound by two instruments, a gong and a whistle are studied using a cathode ray oscilloscope (CRO). Figure 6.1 shows tracings produced by sounds from the gong and the whistle.

(a) What is meant by frequency ? ………………………………………………………………………………….…

[1 mark]

(b) Based on Figure 6.1, compare the frequencies of sound waves produced by the gong and the whistle. ………………………………………………………………………………….…

[1 mark]

(c) Compare the magnitude of the following for sound waves produced by the gong and the whistle.

(i) Velocity ………………………………………………………………………………

[1 mark]

(ii) Wavelength ………………………………………………………………………………

[1 mark]

CRO Screen

Whistle’s signal

Gong’s signal

FIGURE 6.1

For Examiner’s

Use

6 (a) 6 (b) 6 (c)(i) 6 (c)(ii)

Lihat sebelah

SULIT 27 4531/2

4531/2 SULIT

(d) The gong and the whistle are used to produce sound at P in the laboratory.

It is observed that sound by the gong can be heard clearly at Q, R and S outside the laboratory but sound by the whistle can be heard clearly only at Q and R but not clearly at S. The positions of P, Q, R and S are shown in Figure6.2.

(i) Name the wave phenomenon which makes it possible for the sound by the gong to be heard clearly at S. ……………………………………………………………………………

[1 mark]

(ii) Based on answers in (c) and (d)(i), state the relationship between wavelength and this wave phenomenon. ……………………………………………………………………………

[1 mark]

(e) Sound waves with frequencies between 1 and 15 MHz are used for detecting objects in the body. The instrument works optimumly if the wavelength of the sound waves used by the instrument is equal to the size of the object. If sound travels at 1540 m s-1 in tissues , calculate the minimum frequency needed to detect 0.5 mm objects.

[2 marks]

Q R S

Laboratory

P

FIGURE 6.2

For Examiner’s

Use

6 (d)(i) 6 (d)(ii) 6 (e) Total

Lihat sebelah

SULIT 29 4531/2

4531/2 SULIT

7 Figure 7.1 shows hot food placed in a metal container. This food becomes cold in a short

time interval.

(a) Why does the hot food kept in the metal container become cold fast? ..……….…………………………………………………………………………….

[1 mark]

A metal container of mass 2 kg is used to keep the food which is at a temperature of 50oC. After 15 minutes, the food’s temperature has dropped to room temperature, 30oC.

(b) (i) Calculate the heat given off by the metal container to the surroundings. The specific heat capacity of the metal is 450 J kg-1 oC-1.

[2 marks ]

(ii) What is the assumption made in (b)(i) ? ……….………………………………………………………………………

[1 mark]

hot food

FIGURE 7.1

For Examiner’s

Use

7(a) 7(b)(i) 7(b)(ii)

Lihat sebelah

SULIT 31 4531/2

4531/2 SULIT

Figure 7.2 shows a metal container which has been modified to keep hot food so that the food remains hot for a longer time.

(c) (i) Name the electrical components X and Y in Figure 7.2. Component X : ...............................................................................................

Componen Y : ...............................................................................................

[2 marks ]

(ii) Name the function of components X and Y. Component X : ...............................................................................................

Componen Y : ...............................................................................................

[2 marks ]

hot food

Water

FIGURE 7.2

240V power supply

YX

For Examiner’s

Use

7(c)(i) 7(c)(ii) Total

Lihat sebelah

SULIT 33 4531/2

4531/2 SULIT

The graph in Figure 7.3 shows the rate of temperature decrease for the metal container

before components X and Y are installed.

(d) Sketch a graph showing the rate of temperature decrease for the metal container after components X and Y are installed.

[2 marks]

Temperature/ oC

Time/ minute

50

30

FIGURE 7.3 15

Temperature/ oC

Time/ minute

50

30

FIGURE 7.4

For Examiner’s

Use

7(d) Total

Lihat sebelah

SULIT 35 4531/2

4531/2 SULIT

8 Figure 8.1 shows a model of an alternating current generator in a laboratory.

(a) Name the part labeled X in the alternating current generator. ..……….……………………………………………………………………………

[1 mark]

(b) (i)

Sketch a graph of induced current against time when the armature is rotated as shown in Figure 8.1.

[2 marks ]

(ii) Sketch a graph of induced current against time when the armature is rotating faster.

[ 2marks ]

X

Direction of rotation

U S

Armature

Galvanometer

0

FIGURE 8.1

For Examiner’s

Use

8(a) 8(b)(i) 8(b)(ii)

Lihat sebelah

SULIT 37 4531/2

4531/2 SULIT

A teacher wishes to use a generator for a camping expedition. Table 8.1 shows the

characteristics of 3 generators J, K and L.

TABLE 8.1

Generator Light Bulb

Generator Type

Output Voltage, V Bulb Rating Maximum Number of Bulbs

Operating at Normal Brightness J 110 110V, 2A 10

K 240 240V, 1A 5

L 110 110V, 4A 4

(c) (i) What is meant by the label “ 24V, 60W” on a bulb ?

……….……………………………………………………………………[1 mark]

(ii) Calculate the power dissipated in each generator.

[ 4 marks]

(iii) Which generator is most suitable to be used ? Give your reason.

……….……………………………………………………………………

……….……………………………………………………………………

……….……………………………………………………………………[2 marks]

For Examiner’s

Use

8(c)(i) 8(c)(ii) 8(c)(iii) Total

Lihat sebelah

SULIT 41 4531/2

Lihat sebelah

4531/2 SULIT

Section B

[20 marks]

Answer any one question in this section

The time suggested to complete this section is 30 minutes.

. 1 Figure 1.1 shows a pile driver being released from different heights to hit a pile which is placed perpendicularly to the ground. The impact causes the pile to sink to different depths into the ground, as shown in Figure 1.2.

(a) What is meant by the term energy ? [1 mark]

(b) Using Figures 1.1 and 1.2, compare the height from which the pile driver is released and the depth the pile is driven into the ground. State the relationship between the height from which the pile driver is released and the force exerted on the pile.

[5 marks]

Pile driver

h1

FIGURE 1.1

Pile X

h2

Ground Pile Y

FIGURE 1.2

Pile driver

Pile X Pile Y Ground

SULIT 44 4531/2

4531/2 SULIT

(c). Figure 1.3 shows a worker cutting grass by pushing and pulling a lawn mower.

Using Physics concepts, compare the difficulty of the job when the worker : (i) pushes the lawn mower. (ii) pulls the lawn mower. You may use diagrams in your answer.

[4 marks]

(d) The Malaysian Amateur Athletics Union (MAAU) is taking part in the Olympics to be held in Beijing in the year 2006. One of the events contested will be the pole vault. Figure 1.4 shows the action of a pole vaulter.

Use your knowledge in physics to identify and explain the characteristics that

MAAU will use to choose the athletes and the type of training needed for the coming competition in the following aspects. (i) Athletes choosen to participate in the competition. [2 marks ]

(ii) Equipment needed. [4 marks]

(iii) Safety of equipment and athletes. [4 marks]

FIGURE1.3

FIGURE 1.4

Lihat sebelah

43

SULIT 45 4531/2

4531/2 SULIT

2 Wave phenomena affect both water and light waves.

Figure 2.1 shows water waves in a ripple tank travelling from a deep zone to a shallow zone. Figure 2.2 shows a light ray bending when travelling from air into water in a glass.

(a) (i) What is meant by the term wave front ? [1 mark]

(ii) Compare the propagation of both water and light waves in Figures 2.1 and 2.2 . Hence find the relationship between the physical quantities involved and identify the physics concept involved here.

[5 marks]

(b) Based on physics principles, explain why the sound of a horn can be heard more clearly at night than during the day.

[4 marks]

Water

FIGURE 2.2 FIGURE 2.1

Deep water

Shallow

SULIT 47 4531/2

Lihat sebelah

4531/2 SULIT

(c)

Figure 2.3 shows a bay and a cape. You have been selected as the consultant to company given the task of choosing a suitable location and developing the area into a tourist attraction. Using physics concepts,

(i) select the suitable location and explain why it is suitable to be developed as a tourist attraction.

[2 marks]

(ii) suggest the structures needed to overcome the problem of beach erosion. [4 marks]

(iii) explain the characteristics of building materials needed for the structures.

[4 marks]

FIGURE 2.3

SULIT 49 4531/2

4531/2 SULIT

Section C

[20 marks]

Answer any one question in this section.

The time suggested to complete this section is 30 minutes.

3. Figure 3.1 shows an optical fibre used in the telecommunications industry. An optical fibre is made up of two parts, an inner and an outer layer. The outer layer has a refractive index of 1.47.

Table 3.2 shows characteristics of five materials that can be used to produce the inner or outer layer of an optical fibre.

Characteristics

Material Percentage of Light

Transmitted/ %

Refractive Index

Stiffness

Density/ kg m-3

P 99 1.40 Stiff 2250

Q 95 1.45 Moderate 2300

R 90 1.49 Stiff 2650

S 85 1.52 Moderate 2500

T 90 1.60 Stiff 3500

TABLE 3.2

Inner layer

Outer layer

FIGURE 3.1

SULIT 51 4531/2

Lihat sebelah

4531/2 SULIT

(i) What is meant by the term refractive index ?

[1 mark] (ii) Explain how light is propagated from one end to the other through the

optical fibre. [4 marks]

(iii) You are requested to choose the suitable material for the manufacture of the

inner layer of optical fibres. By referring to the materials given in Table 3.1, explain the suitability of each characteristic and suggest the most suitable material for the manufacture of the inner layer of optical fibres.

[10 marks]

(b) Figure 3.2 shows a beam of light directed into a clear prism. The refractive index of the prism is 2.419.

. (i) Explain why the beam of light is not refracted at the surface AB.

[1mark]

(ii) Calculate the critical angle of the prism. [2 marks]

(iii) What happens to the beam of light when it reaches surface AC ? Explain why this happens .

[2 marks]

FIGURE 3.2

Clear prism

Rajah 3.2 45º

C B

A

Light ray

SULIT 53 4531/2

4531/2 SULIT

4 Figure 4.1 shows the installation of decorative lights in the front of a house to celebrate the 48th Independence Day .

Table 4.1 shows the characteristics of the connecting wires, power of light bulbs and possible ways of wiring the light bulbs in the circuit .

TABLE 4.1

Connecting Wire

Characteristic

Option

Resistivity / Ωm

Density / kg m-3

Power of light bulb / W

Light bulb wire

connection

P 1.72 x 10-8 8.93 x 103 15 In parallel

Q 9.7 x 10-8 7.87 x 103 60 In series

R 5.3 x 10-8 10.50 x 103 60 In series

S 2.5 x 10-8 2.70 x 103 15 In parallel

(a) (i) What is Ohm’s Law ? [1 mark ]

(ii) You have been assigned to investigate the characteristics of the connecting

wires, light bulbs, and ligbt bulb wiring in Table 4.1. Explain the suitablility of each characteristic and select the most suitable option. Explain your choice.

[10 marks ]

Front of house

Connecting wire

Light bulb

House

FIGURE 4.1

Lihat sebelah

53

SULIT 55 4531/2

4531/2 SULIT

(b) Three similar bulbs are connected in series to three dry cells each having a value of 1.5V . The cells are also connected in series.

(i) Draw a diagram of the circuit. [2 marks ]

(ii) What is the total resistance in the circuit ?

Hence determine the resistance of each bulb.

[ 3 marks ]

(c) Figure 4.3 shows two resistors R1 and R2 connected to a power supply V.

Compare and explain :

(i) the magnitude of the current flowing through R1 to the current through R2. (ii) the potential difference across R1 to the potential difference across R2. [4 marks]

END OF QUESTION PAPER

V

R1

R2

FIGURE 4.3

55