SULIT

5/2 SULIT

55/2

SCIENCE

Kertas 2

1 ½ jam

PRA PENILAIAN MENENGAH RENDAH 2012

SCIENCE

Kertas 2

Satu jam tiga puluh minit

JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU

Kertas soalan ini mengandungi 15 halaman bercetak

[Lihat sebelah

1. Tulis nama penuh dan tingkatan anda

pada ruangan yang disediakan.

2. Kertas soalan ini adalah dalam Bahasa

Inggeris.

3. Calon dikehendaki membaca maklumat di

halaman belakang kertas soalan ini.

Untuk Kegunaan Pemeriksa

Kod Pemeriksa:

Bahagian Soalan Markah

Penuh

Markah

Diperoleh

A

1 6

2 6

3 6

4 6

5 8

6 8

B

7 8

8 12

JUMLAH 60

SULIT 55/2

55/2 [Lihat sebelah

SULIT

2

Section A

[40 marks]

Answer all questions.

1 Diagram 1 shows a cross ction of a dicotyledonous seed.

Rajah 1 menunjukkan suatu keratan rentas biji benih dikotiledon.

DIAGRAM 1

Rajah 1

(a) On Diagram 1, label the structure L, M and N using the following words.

Pada rajah 1, labelkan struktur L, M dan N menggunakan perkataan

berikut:

[ 3 marks ]

(b) Draw lines to match the structure to its correct function.

Lukis garisan untuk memadankan struktur dengan fungsinya yang betul.

[ 3 marks ]

Cotyledon Radicle Testa

Kotiledon Radikel Testa

L :

M :

N :

L

Provides food for the seedling during gemination

Membekalkan makanan kepada anak benih semasa

percambahan.

Grow out and develop into roots

Keluar dan berkembang membentuk akar

Potects the seed

Melindungi biji benih

M

N

SULIT 55/2

55/2 [Lihat sebelah

SULIT

3

2 Diagram 2 shows the apparatus set-up to study the use of gas during germination.

Rajah 2 menunjukkan alat radas yang dipasangkan untuk mengkaji gas yang

digunakan semasa percambahan.

DIAGRAM 2

Rajah 2

(a)(i) What can be observed to the indicator at the end of this activity?

Apakah yang boleh diperhatikan ke atas penunjuk di akhir aktiviti?

............................................................................................................................

[1 mark]

(ii) Explain your answer in (a)(i).

Terangkan jawapan anda di (a)(i)

.......................................................................................................................

..........................................................................................................................

[1 mark]

(iii) Why is the cotton wool soaked in sodium hydroxide solution?

Mengapakah bulu kapas direndamkan di dalam larutan natrium

hidroksida?

.........................................................................................................................

[1 mark]

(b) What happens to the drop of indicator if the germinating seed is replaced

with cockroach ?

Apa akan berlaku kepada titisan penunjuk jika biji benih yang bercambah

digantikan dengan lipas ?

.................................................................................................................................

[1 mark]

Cotton wool soaked with

sodium hydroxide solution

Kapas direndam dengan

larutsn natrium hidroksida

Indicator

Penunjuk

Boiling tube

Tabung didih

Germinating seeds

Biji benih bercambah

SULIT 55/2

55/2 [Lihat sebelah

SULIT

4

(c ) Suggest how the gas released in this experiment can be tested.

Cadangkan bagaimana gas yang dibebaskan boleh diuji.

Method

Kaedah: . .....................................................................................

Results

Keputusan: ........................................................................................

[2 marks]

3 Diagram 3.1 shows the apparatus set-up for a food test

Rajah 3.1 menunjukkan alat radas untuk suatu ujian makanan

DIAGRAM 3.1

Rajah 3.1

(a)(i) State the class of food in sample food P if a red precipitate is formed.

Nyatakan kelas makanan dalam sampel makanan P jika mendakan merah

terbentuk .

. ................................................................................................................

[1 mark]

(ii) Give one function food class in (a)(i).

Beri satu fungsi kelas makanan dalam (a)(i)

......................................................................................................................

[1 mark ]

Food sample P + Millon

reagent

Sampel makanan P + reagen

Millon

Water

Air

SULIT 55/2

55/2 [Lihat sebelah

SULIT

5

(iii) State one disease cause by insufficient of this food class to the children.

Nyatakan satu penyakit akibat kekurangan kelas makanan ini ke atas

kanak-kanak.

..................................................................................................................

[ 1 mark ]

(b) Diagram 3.2 shows the human digestive tract

Rajah 3.2 menunjukkan salur pencernaan manusia

(i) Name organ P

Namakan organ P.

................................................................................................................

[ 1 mark ]

(ii) Which class of food is digested at P?

Apakah kelas makanan yang dicernakan di P?

...................................................................................................................

[ 1 mark ]

(iii) Give one reason why P must be acidic.

Berikan satu alasan mengapakah P perlu berasid.

...............................................................................................................

[ 1 mark ]

P

SULIT 55/2

55/2 [Lihat sebelah

SULIT

6

5 Diagram 5 shows two filament bulbs, P, Q and R with different power ratings.

Rajah 5 menunjukkan dua mentol filamen, P, Q dan R yang mempunyai kuasa

berlainan.

Diagram 5

Rajah 5

(a)(i) State the bulb that save energy the most if the bulbs are used at the same

period of time.

Nyatakan mentol yang paling menjimatkan tenaga jika mentol-mentol

digunakan untuk tempoh masa yang sama.

................................................................................................................

[ 1 mark ]

(ii) Explain your answer in (a)(i)

Terangkan jawapan anda di (a)(i)

...................................................................................................................

[ 1 mark ]

(iii) Calculate the energy used if bulb Q is swiched on for 5 hours.

Hitungkan tenaga yang digunakan jika mentol Q dihidupkan selama 5

jam.

[ 2 marks ]

Q

60 W, 240V 100 W, 240V

P R

25 W, 240V

Energy (kWh) = Power (kW) x Time (h)

Tenaga (kWj) = Kuasa (kW) x Masa (j)

SULIT 55/2

55/2 [Lihat sebelah

SULIT

7

(b)(i) Bulb P, Q and Q is used in a lighting circiut of a house. State how the

three bulbs should be connected.

Mentol P, Q dan R digunakan dalam litar lampu sebuah rumah.

Nyatakan bagaimana ketiga-tiga mentol sepatutnya disambungkan.

....................................................................................................................

[ 1 mark ]

(ii) Give reason for answer in (b)(i)

Beri alasan bagi jawapan (b)(i)

.....................................................................................................................

[ 1 mark]

(iii) Explain how this connection helps the consumer saved energy

Terangkan bagaimana penyambungan ini membantu menjimatkan tenaga

pengguna.

.....................................................................................................................

.....................................................................................................................

[ 2 marks]

4

Diagram 4 shows a carbon cycle.

Rajah 4 menunjukkan suatu kitar karbon.

DIAGRAM 4

Rajah 4

Carbon dioxide in the atmosphere

Karbon dioksida dalam atmosfera

Process K

Plant respiration

Respirasi tumbuhan

Animal respiration

Respirasi haiwan

Decaying of dead organisms

Pereputan organisma mati

SULIT 55/2

55/2 [Lihat sebelah

SULIT

8

(a)(i) State process K.

Nyatakan proses K.

..............................................................................................................................................

[ 1 mark ]

(ii) State one importance of process K to living things

Nyatakan satu kepentingan proses K kepada benda hidup

.............................................................................................................................................

[ 1 mark ]

(iii) State the primary source of energy in the carbon cycle.

Nyatakan sumber utama tenaga dalam kitar karbon.

..................................................................................................................................

[ 1 mark ]

(c)(i) Carbon compounds from decayed organisms in a millions of years can changed

into into fossil fuel. Explain how fossil fuel formed from the decayed organisms

Sebatian karbon daripada organisma reput berjuta tahun boleh berubah menjadi

bahan api fosil. Terangkan bagaimana bahan api yang terbentuk daripada

organisma yang mereput.

..................................................................................................................................

.................................................................................................................................

.................................................................................................................................

[ 2 marks]

(ii) Give one example of the fossil fuel formed.

Berikan satu contoh bahan api fosil terbentuk.

..................................................................................................................................

[ 1 mark ]

SULIT 55/2

55/2 [Lihat sebelah

SULIT

9

6. Diagram 6.1 shows the longitudal section of human ear.

Rajah 6.1 menunjukkan mekanisma penglihatan manusia yang normal.

Diagram 6.1

Rajah 6.1

(a)(i) Name the structure that allows the sound vibration to enter the ear.

Namakan struktur yang membenarkan getaran bunyi masuk ke dalam telinga.

...........................................................................................................................

[ 1 mark ]

(ii) Explain what happens to sound vibration before and after it reaches cochlea

Terangkan apa yang berlaku kepada getaran bunyi sebelum dan selepas ia

sampai ke koklea.

...............................................................................................................................

..............................................................................................................................

[ 2 marks]

(iii) Give one part of the the ear which does not involve in the hearing mechanism.

Berikan satu bahagian telinga yang tidak terlibat dengan mekanisma

pendengaran.

...............................................................................................................................

[ 1 mark ]

(iv) Explain why an old man is hardly to hear?

Terangkan mengapa seorang tua sukar mendengar?

.....................................................................................................................................

[ 1 mark ]

SULIT 55/2

55/2 [Lihat sebelah

SULIT

10

(b) Diagram 6.2 shows an activity to study the property of sound.

Rajah 6.2 menunjukkan suatu aktiviti untuk mengkaji sifat bunyi

Diagram 6.2

Rajah 6.2

(i) What happen to the sound of the bell when it hit the wooden plank .

Apakah yang terjadi pada bunyi loceng apabila ia mengena pada kepingan kayu.

..............................................................................................................................

[ 1 mark ]

(ii) State one property of sound.

Nyatakan satu sifat bunyi.

..............................................................................................................................

[ 1 mark ]

(iii) Explain how this sound property help the bat to find its way at night.

Terangkan bagaimana sifat bunyi ini mebantu kelawar mencari jalannya pada

waktu malam.

................................................................................................................................

[ 1 mark ]

Plastic tube

Tiub plastik Bell

Loceng

Ear

Telinga

Wooden plank

Kepingan papan

SULIT 55/2

55/2 [Lihat sebelah

SULIT

11

Section B

[20 marks]

Answer all questions.

7 Diagram 7.1 an activity to investigate the boiling point of different water.

Rajah 7.1 menunjukkan suatu aktiviti untuk menyiasat takat didih air berlainan.

Distilled water

Air suling

water + Salt

air + Garam

SULIT 55/2

55/2 [Lihat sebelah

SULIT

12

Diagram 7.1

Rajah 7.1

Based on the observation in diagram 7.1,

Berdasarkan pemerhatian pada rajah 7.1,

(a) Record the reading of thermometer in table 7.2

Rekodkan bacaan termometer dalam jadual 7.2

Type of water

Jenis air

Reading of thermometer ( 0C)

Bacaan termometer

Distilled water

Air Suling

100 0C

Water + salt

Air +garam

Sugar +water

Air + gula

[ 2 marks]

(b)(i) State the difference in boiling point of water without impurities and with

impurities.

Nyatakan perbezaan takat didih air tanpa bendasing dan air yang ada

bendasing.

.........................................................................................................................

[ 1 mark ]

(ii) State one inference based on the observation.

Nyatakan satu inferens berdasarkan pemerhatian.

....................................................................................................................

[ 1 mark]

water + Sugar

air + Gula

SULIT 55/2

55/2 [Lihat sebelah

SULIT

13

(iii) State the relationship between the presence of impurities in water and

boiling point of water.

Nyatakan hubungan antara kehadiran bendasing dalam air dengan

takat didih air.

..................................................................................................................

[ 1 mark ]

(c) Table 7.3 shows boiling point of some sample water taken from different

sources.

Jadual 7.3 menunjukkan takat didih sampel air yang diambil daripada

sumber

berlainan.

Boiling point (0C )

Takat didih ( 0C )

100 0C 110

0C 130

0C

Sample water

Sampel air

Rain water

Air hujan

River water

Air sungai

Sea water

Air laut

Classify sample water based on their boiling point

Kelaskan sampel berdasarkan takat didih mereka.

Impurities

Bendasing

Sample water

Sampel air

Does not contain impurities

Tidak mengandungi bendasing

Contain impurities

Mengandungi bendasing

[ 1 mark]

( d) Based on the the activities, what can you deduce about the effect of

impurities on boiling of water.

Berdasarkan aktiviti-aktiviti ini, apakah yang boleh anda deduksikan

mengenai kesan bendasing terhadap takat didih air.

........................................................................................................................

[ 1 mark ]

SULIT 55/2

55/2 [Lihat sebelah

SULIT

14

8. Diagram 8.1 shows the reaction between metal P, Q and R with oxygen.

Rajah 8.1 menunjukkan tindakbalas antara logam P, Q dan R dengan oksigen.

Potassium manganate crystals

Hablur kalium manganat

Potassium manganate crystals

Hablur kalium manganat

Metal Q - glow

Logam Q berbara

Metal R - Burns brightly

Logam R Terbakar dengan terang

Potassium manganate crystals

Hablur kalium manganat

Metal P - Burn very brightly

Logam P Terbakar dengan sangat

terang

Diagram 8.1

Rajah 8.1

SULIT 55/2

55/2 [Lihat sebelah

SULIT

15

(a) the observation , state what happen when the metal react with

oxygen .

Berdasarkan pemerhatian ,nyatakan apa yang berlaku apabila

logam bertindakbalas dengan oksigen .

Metal P : Burn very brightly

Logam P Terbakar sangat terang

Metal Q :

Logam Q

Metal R :

Logam R

[ 2 marks ]

(b) Based on the experiment, record the time taken for the reaction to

complete in table 8.4

Berdasarkan pemerhatian , rekodkan masa yang diambil untuk

tindakbalas lengkap dalam jadual 8.4

Table 8.4

Jadual 8.4

[2 marks ]

(c) State the variables involved

Nyatakan pemboleh ubah yang terlibat .

(i) Manipulated variable :

Pemboleh ubah di manipulasi

……………………………………………………

(ii) Responding variable :

Pemboleh ubah bertindakbalas

………………………………………………………

[ 2 marks ]

Metal react with oxygen

Logam bertindakbalas dengan oksigen

Time taken(s)

Masa yang diambil (s)

P 10 s

Q

R

…………………………………………………..

…………………………………………………..

8 (b)

8 (a)

8 (c)

SULIT 55/2

55/2 [Lihat sebelah

SULIT

16

(d) Based on table 8.4 , draw a bar chart of reaction of metal oxygen

against

time taken for reaction .

Berdasarkan jadual 8.4 , lukis carta bar bagi tindakbalas logam

oksigen dengan masa yang diambil semasa tindakbalas .

P Q R

Metal

Logam

[ 2 marks ]

8 (d)

Time taken for

reaction to

complete(s)

Masa lengkap

tindakbalas

berlaku

10

20

30

40

50

60

SULIT 55/2

55/2 [Lihat sebelah

SULIT

17

(e) Based on the experiment , state the relationship between the reactivity

of metal with time taken for reaction to complete

Berdasarkan eksperimen , nyatakan hubungan antara tindakbalas logam

dengan masa tindakbalas selesai .

…………………………………………………………………………

…………………………………………………………………………

[ 1 mark ]

( f ) Based on the experiment , state the operational definition of the

‘reactivity of metal .’

Berdasarkan eksperimen , nyatakan definisi secara operasi

‘ kereaktifan logam .’

……………………………………………………………………………

…………………………………………………………………………

[1 mark ]

8 (e)

8 (f)

SULIT 55/2

55/2 [Lihat sebelah

SULIT

18

INFORMATION FOR CANDIDATES

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

2. Answer all questions in both sections.

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

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

5. If you wish to change your answer, neatly cross out the answer that you have done. Then

write down the new answer.

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

7. Marks allocated for each question or sub-part of a question are shown in brackets.

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

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

10. Hand in this question paper at the end of the examination.