SEKTOR SEKOLAH BERASRAMA PENUH

KEMENTERIAN PELAJARAN MALAYSIA

PEPERIKSAAN PERCUBAAN PMR 2006

SAINS

Kertas 2

Satu jam tiga puluh minit

JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU

1. Tuliskan nombor kad pengenalan dan angka gilirananda pada ruang yang disediakan .

2. Kertas soalan ini adalah dalam Bahasa Inggeris .

3. Calon dikehendaki membaca maklumat di halaman 2.

Kertas soalan ini mengandungi 15 halaman bercetak[Lihat sebelah

55/2 © 2006 Hak Cipta Sektor SBP

SULIT55/2SainsKertas 2Ogos20061½ jam

NO. KAD PENGENALAN

ANGKA GILIRAN

Kod Pemeriksa

Bahagian Soalan MarkahPenuh

MarkahDiperolehi

A

1 6

2 5

3 6

4 9

5 8

6 6

7 8

8 12

Jumlah 60

Nama :_______________________

INFORMATION FOR CANDIDATES

1. This question paper consists of two sections : Section A and Section B.

2. Write your answers in the spaces provided in the question paper.

3. Show your working, it may help you to get marks.

4. If you wish to cancel any answer , neatly cross out the answer.

5. The diagrams in the questions provided are not drawn to scale unless stated.

6. Marks allocated for each question or part question are shown in brackets.

7. The time suggested to complete Section A is 60 minutes and Section B is 30 minutes.

8. You may use a non-programmable scientific calculator.

9. Hand in all your answer sheets at the end of the examination.

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Section A( 40 marks )

Answer all questionsThe time suggested to complete this section is 60 minutes

1. Figure 1.1 shows the structure of two cells.

FIGURE 1.1 FIGURE 1.2

a) Label the following structures in Figure 1.1.

Nucleus Cytoplasm Neck [3 marks]

b) Based on the structure in Figure 1.2, complete Table 1.

Name of structure P Function of structure P

TABLE 1 [2 marks]

c) State one difference between Figure 1.1 and Figure 1.2.

____________________________________________________________________________ [1 mark]

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P

2. Figure 2 shows a stomata on the surface of a leaf.

FIGURE 2

(a) Label the structures Q and R in Figure 2 using the words given below.

[2marks]

(b) What is the function of P ?

__________________________________________________________________ [1 mark]

(c) Why are the stomata important to plants ?

__________________________________________________________________ [1 mark]

(d) Give one reason why plants need to lose water.

__________________________________________________________________ [1 mark]

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Chloroplast Stoma Guard cell

3. Figure 3 shows an experiment to study the reaction between metal and oxygen.

FIGURE 3

a) What is the function of the potassium permanganate crystals?

_____________________________________________________________________

[1 mark]b) Between zinc and copper, which metal is more reactive towards oxygen?

_____________________________________________________________________[1 mark]

c) Name the product formed when zinc reacts with oxygen.

______________________________________________________________________[1 mark]

d) Write the word equation for the reaction between copper and oxygen.

+

[2 marks]

e) Give one reason why metals such as gold and silver do not react with oxygen.

_________________________________________________________________________[1 mark]

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4. Figure 4 shows an experiment related to heat flow. Equal volumes of hot water are poured into each flask. The temperature of water is taken every 5 minutes for 20 minutes.

FIGURE 4

Table 2 shows the results obtained.

Time (minutes) Temperature of water in flasks ( oC )P Q R

0 90 90 905 84 86 8710 79 83 8515 75 80 8320 71 78 82

TABLE 2

a) What is the aim of this experiment?

_______________________________________________________________________ [1 mark]

b) State the hypothesis for this experiment.

_______________________________________________________________________ [1 mark]

c) After 20 minutes, which flask shows the lowest heat loss?

______________________________________________________________________[1 mark]

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d) Predict what will happen to the temperature if the paper is removed from flask P after 20 minutes.

______________________________________________________________________

[1mark]

e) Based on your answer in (c), which material is the best insulator?

__________________________________________________________________________

[1 mark]f) State how heat is lost from the round-bottomed flasks.

__________________________________________________________________________[1 mark]

g) Arrange the materials according to their ability to insulate heat in ascending order.

__________________________________________________________________________[1 mark]

h) i) In your opinion, which material is suitable for making winter jackets?

_____________________________________________________________________

[1 mark] ii) Give a reason for your answer in (f)(i).

____________________________________________________________________

_____________________________________________________________________

[1 mark]

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5. Figure 5.1 shows the fertilization process in a plant.

FIGURE 5.1

a) Name the structure labelled Q in Figure 5.1 and state its function.

[2 marks] b) Show on Figure 5.1 the structure Y, where the male gamete develops.

[1 mark]

c) Mark, using arrows, → to show the movement of male gametes in the process of fertilization in Figure 5.1. [1 mark]

d) What does a pollen grain form immediately after it lands on the stigma?

______________________________________________________________ [1 mark]

e) State the development of the following parts after fertilization.

(i) Ovule : ___________________________________________________

(ii) Ovary : ___________________________________________________[2 marks]

f) What happens to the stamen after the fruit develops?_____________________________________________________________

[1 mark]

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Q

Structure Function

6. Figure 6 shows an experiment to study neutralisation.

FIGURE 6

a) What is neutralisation?

________________________________________________________________________

________________________________________________________________________ [1mark]

b) i) State the purpose of the Universal indicator.

_______________________________________________________________________ [1 mark]

ii) What is the pH of the solution when neutralization takes place completely.

_____________________________________________________________________ [1 mark]

iii) What is the taste of the neutral solution in (b) (ii)?

_____________________________________________________________________ [1 mark]c) Write the word equation for this reaction.

+ + +

[1 mark]

d) Give one example of neutralization in our daily lives.

______________________________________________________________________ [1 mark]

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Universal indicator

sodium hydroxide hydrochloric acid

Section B

(20 marks)Answer all questions

The time suggested to complete this section is 30 minutes

7. Figure 7 shows a picture of animals R, S, T, U, and V

FIGURE 7

Observe the animals in Figure 7 carefully. a) Based on your observations in Figure 7, state the characteristics for any four animals R, S, T, U and V

R. ______________________________________________________

S. ______________________________________________________

T. _____________________________________________________

U. _____________________________________________________

V. _____________________________________________________ [4 marks]

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RS

T

VU

b) Classify animals R, S, T, U and V into groups based on their common characteristics. Name the animal belonging to each group.

[4 marks ]

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Commoncharacteristics

Name of animals

8. Figure 8 shows an electrical circuit to study the relationship between voltage, current and resistance .

FIGURE 8

This experiment is repeated using two, three and four dry cells connected in series.The ammeter and voltmeter readings are recorded. The result is as shown in Table 3.

Number of Dry Cells Current (A) Voltage (V)0 0 01 0.1 1.52 0.2 3.03 0.3 4.54 0.4 X

TABLE 3

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a) Record the ammeter reading in the space provided.

Ammeter reading = _________________A [1 mark]

b) State the manipulated and responding variables in the experiment.

Manipulated variable

Responding variable

Controlled variable Length of wire used in the circuit Resistance/ rheostat setting Type of dry cellsType of wire

[ 2 marks]

c) Based on Table 3, find the value of X.

_____________________________________________________________________

[1 mark ]

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d) Based on the information in Table 3, plot a graph to show the relationship between voltage and current.

[2 marks]

e) (i) Based on the graph, what is the relationship between voltage and current ?

_______________________________________________________________ [1 mark]

(ii) Write a relationship between voltage, current and resistance according to Ohm’s law

______________________________________________________________ [1 mark]

(iii) Predict what will happened to the ammeter reading if the rheostat is replaced with a short length of copper wire ?

[ 1 mark ]

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f) Draw a parallel circuit in symbols using the following components:

[2 marks]

g) The electrical wiring system in houses is in parallel circuits. Give one advantage of this system. _____________________________________________________________________

_____________________________________________________________________ [1 mark]

End of Question Paper

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Connecting wires Switch Two dry cells One voltmeter Two bulbs