SPM Trial 2009 Sce Q&A (Sabah)

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    Excel 2 SPM

    SCIENCE

    Kertas 1

    Sept 2009

    1 jam

    SAINS

    KERTAS 1

    Satu jam lima belas minit

    JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU

    1. Kertas soalan ini mengandungi 50 soalan.

    2. Jawab semua soalan.

    3. Jawab dengan menghitamkan ruangan yang betul pada kertas jawapan.

    4. Hitamkan satu ruangan sahaja bagi setiap soalan.

    5. Sekiranya anda hendak menukarkan jawapan, padamkan tanda yang telah dibuat

    dan hitamkan jawapan yang baru.

    6. Rajah yang mengiringi soalan tidak dilukiskan mengikut skala kecuali dinyatakan.

    7. Anda dibenarkan menggunakan kalkulator saintifik yang tidak boleh diprogram.

    ________________________________________________________________________

    Kertas soalan ini mengandungi 25 halaman bercetak.

    [Lihat sebelah

    1511/1 2009 Hak Cipta Jabatan Pelajaran Sabah SULIT

    JABATAN PELAJARAN NEGERI SABAH

    SIJIL PELAJARAN MALAYSIA 2009

    EXCEL 2

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    SULIT 2 1511/1

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    1. Diagram 1 shows the components of the human nervous system.

    Rajah 1 menunjukkan komponen dalam system saraf manusia.

    Diagram 1

    Rajah 1

    What is X?

    Apakah X?

    A Sensory nervous system

    Sistem saraf deria

    B Spinal nervous system

    Sistem saraf tunjang

    C Peripheral nervous system

    Sistem saraf periferi

    D Receptors and effectors

    Reseptor dan efektor

    2. Diagram 2 shows a neurone.

    Rajah 2 menunjukkan satu neuron.

    Diagram 2

    Rajah 2

    What is X?

    Apakah X?

    A Axon

    Akson

    B Dendron

    Dendron

    C Dendrite

    Dendrit

    D Cell bodyBadan sel

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    SULIT 3 1511/1

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    3 Diagram 3 shows one of the receptor found in the human body.

    Rajah 3 menunjukkan satu daripada reseptor yang terdapat dalam badan manusia.

    Diagram 3

    Rajah 3

    Which part of the body this receptor can be found?

    Di manakah reseptor ini boleh didapati dalam badan?

    A Muscle

    OtotB Skin

    Kulit

    C Nose

    Hidung

    D Eye

    Mata

    4. The glucose content in a patients urine is more than the normal level.

    Which endocrine gland is not functioning well?

    Kandungan glukosa dalam air kencing seorang pesakit melebihi aras normal.Kelenjar endokrin yang manakah gagal berfungsi?

    A Pituitary

    Pituitari

    B Pancreas

    Pankreas

    C Thyroid

    Tiroid

    D Testis

    Testis

    5. What is the process involved in the production of new cells for growth?

    Apakah proses yang terlibat dalam penghasilan sel-sel baru untuk pertumbuhan?

    A Mitosis

    Mitosis

    B Meiosis

    Meiosis

    C Mutation

    Mutasi

    D Fertilisation

    Persenyawaan

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    SULIT 4 1511/1

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    6. Which comparison of identical and non-identical twins is true?

    Manakah perbandingan yang betul bagi kembar seiras dan kembar tak seiras?

    Identical twins

    Kembar seiras

    Non-identical twins

    Kembar tak seiras

    A Involve two sperms and two ovaMelibat dua sperma dan dua ovum

    Involve one sperm and one ovumMelibatkan satu sperma dan satu ovum

    B Sharing the same placenta

    Berkongsi plasenta

    Have their own placenta

    Mempunyai plasenta tersendiri

    C Same or different sex

    Jantina sama atau berbeza

    Same sex

    Jantina sama

    D Different genetic traits

    Sifat genetik berbeza

    Same genetic traits

    Sifat genetik sama

    7. Diagram 4 shows graphs of variation among the students in a class.

    Rajah 4 menunjukkan graf variasi di kalangan pelajar di dalam satu kelas.

    Diagram 4

    Rajah 4

    Which of the following is correct?

    Manakah antara berikut adalah benar?

    Shoulder width

    Lebar bahu

    Left-handed / Normal

    Kidal / Tangan kanan

    A Continuous variation

    Variasi selanjar

    Discontinuous variation

    Variasi tak selanjar

    B Continuous variation

    Variasi selanjar

    Continuous variation

    Variasi selanjar

    C Discontinuous variation

    Variasi tak selanjar

    Continuous variation

    Variasi selanjar

    D Discontinuous variation

    Variasi tak selanjar

    Discontinuous variation

    Variasi tak selanjar

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    SULIT 5 1511/1

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    8. Diagram 5 shows the inheritance of height in pea plants.

    Rajah 5 menunjukkan pewarisan sifat tinggi pada pokok kacang.

    Diagram 5

    Rajah 5

    Which offspring has a correct pair of genes?

    Manakah anak yang mempunyai pasangan gen yang betul?

    Offspring

    Anak

    Genotype

    Genotip

    A P Tt

    B Q TT

    C R TT

    D S tt

    9. Based on the Periodic Table, which element represents an inert gas?

    Berdasarkan Jadual Berkala, unsur yang manakah mewakili gas nadir?

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    10. Diagram 6 shows the structure of an atom.

    Which of the following represents a neutron?

    Rajah 6 menunjukkan struktur atom.

    Manakah antara berikut mewakili neutron?

    Diagram 6

    Rajah 6

    11. Diagram 7 shows the arrangement of ions in an ionic compound.

    Rajah 7 menunjukkan susunan ion bagi sebatian ionik.

    Diagram 7

    Rajah 7

    Which substance is represented by the particles shown in Diagram 7?

    Manakah bahan yang diwakili oleh partikel seperti Rajah 7?

    A Zinc

    Zink

    B MercuryMerkuri

    C Sulphur

    Sulfur

    D Sodium chloride

    Natrium klorida

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    12. Which of the following is an example of an endothermic reaction?

    Antara berikut yang manakah contoh tindakbalas endotermik?

    A Haber process

    Proses Haber

    B Acid reacts with alkaliAsid bertindakbalas dengan alkali

    C Ammonium salt dissolved in water

    Garam ammonium dilarutkan dalam air

    D Sodium hydroxide crystals dissolved in water

    Hablur natrium hidroksida dilarutkan dalam air

    13. Diagram 8 shows a simple voltaic cell.

    Rajah 8 menunjukkan sebuah sel ringkas.

    Diagram 8

    Rajah 8

    Which sequence of energy conversion is correct?

    Manakah urutan perubahan tenaga yang betul?

    A Electrical energy chemical energy heat energy light energy

    Tenaga elektrik tenaga kimia tenaga haba tenaga cahaya

    B Chemical energy electrical energy heat energy light energy

    Tenaga kimia tenaga elektrik tenaga haba tenaga cahaya

    C Electrical energy

    chemical energy

    light energy

    heat energyTenaga elektrik tenaga kimia tenaga cahaya tenaga haba

    D Chemical energy electrical energy light energy heat energy

    Tenaga kimia tenaga elektrik tenaga cahaya tenaga haba

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    14. Table 1 shows the observations of metals P, Q and R when heated.

    Jadual 1 menunjukkan pemerhatian ke atas logam P, Q dan R apabila dipanaskan.

    Metals

    Logam

    Observation

    Pemerhatian

    P Burns with bright white flameTerbakar dengan nyalaan putih yang terang

    QA bright flame spreads slowly

    Nyalaan terang merebak perlahan

    RA glow spreads slowly

    Berbara secara perlahan

    Table 1

    Jadual 1

    Which is the correct arrangement of the reactivity of metals P, Q and R in an increasingorder?

    Manakah susunan yang betul tentang kereaktifan logam P, Q dan R secara menaik?

    A P , Q , R

    B R, Q , P

    C Q, R, P

    D P, R , Q

    15. A student wants to get a pure liquid X from a mixture of liquids X and Y. Table 2 shows

    the boiling points of both liquids.Seorang pelajar ingin mendapatkan cecair tulen X daripada campuran cecair X dan Y.

    Jadual 2 menunjukkan takat didih bagi kedua-dua cecair.

    Liquid

    Cecair

    Boiling point (o

    C )

    Takat didih (o

    C )

    X 78

    Y 100

    Table 2

    Jadual 2

    Which is the most suitable method for separating the liquids?

    Manakah kaedah yang paling sesuai untuk memisahkan cecair-cecair tersebut?

    A Filtration

    Penurasan

    B Condensation

    Kondensasi

    C Distillation

    Penyulingan

    D Crystallisation

    Penghabluran

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    16. Diagram 9 shows radioactive rays in electrical field.

    Rajah 9 menunjukkan sinaran radioaktif dalam medan elektrik.

    Diagram 9

    Rajah 9

    Which is the alpha ray?

    Manakah merupakan sinaran alfa?

    A P

    B Q

    C R

    D P and R

    17. Diagram 10 shows nuclear fission of uranium.

    Rajah 10 menunjukkan pembelahan nuclear bagi uranium.

    Diagram 10

    Rajah 10

    What is particle P?

    Apakah zarah P?

    A Proton

    Proton

    B Neutron

    Neutron

    C Electron

    Elektron

    D Atom

    Atom

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    18. Diagram 11 shows two identical prisms placed in front of a white screen.

    Rajah 11 menunjukkan dua prisma yang serupa disusun di hadapan sebuah skrin putih.

    Diagram 11

    Rajah 11

    What can be seen on the white screen?

    Apakah yang boleh dilihat di atas skrin putih?

    A A spectrum with red colour on top.

    Spektrum dengan cahaya merah di atas.

    B A spectrum with violet colour on top.

    Spektrum dengan cahaya ungu di atas.

    C A patch of white light.

    Tompok cahaya putih.

    D A patch of red light.

    Tompok cahaya merah.

    19. Diagram 12 shows the structure of a camera.

    Rajah 12 menunjukkan struktur kamera.

    Diagram 12

    Rajah 12

    Which part of the eyes has a similar function to the part of camera labelled X ?

    Bahagian manakah pada mata mempunyai fungsi yang sama seperti bahagian berlabel X?

    A Ciliary muscle

    Otot silia

    B Pupil

    Anak mata

    C Retina

    Retina

    D IrisIris

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    SULIT 11 1511/1

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    20. Diagram 13 shows a candle O in front of a plane mirror.

    Which of the points A, B, C or D will the image be formed?

    Rajah 13 menunjukkan lilin O di hadapan sebuah cermin satah.

    Manakah antara kedudukan A, B, Catau D imej akan terbentuk?

    Diagram 13

    Rajah 13

    21. Diagram 14 shows the production of colours X, Y and Z from the addition of coloured

    lights.

    Rajah 14 menunjukkan hasil warna X, Y dan Z dari penambahan cahaya berwarna.

    Diagram 14

    Rajah 14

    What colours are represented by X, Y and Z?

    Apakah warna yang diwakili oleh X, Y dan Z?

    X Y Z

    A Cyan Magenta Yellow

    Sian Magenta Kuning

    B Yellow Magenta Cyan

    Kuning Magenta Sian

    C Magenta Cyan Yellow

    Magenta Sian Kuning

    D Cyan Yellow MagentaSian Kuning Magenta

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    22. Diagram 15 shows the particles arrangement of steel.

    Rajah 15 menunjukkan susunan zarah bagi keluli.

    Diagram 15

    Rajah 15

    What is the effect of the presence of foreign atoms in steel?

    Apakah kesan kehadiran atom asing di dalam keluli?

    A To prevent the iron atoms from sliding

    Untuk menghalang atom-atom besi dari menggelongsor

    B To increase the electrical conductivity of the iron

    Untuk meningkatkan kekonduksiaan elektrik bagi besi.

    C To increase the empty spaces between the iron atoms

    Untuk meningkatkan ruang kosong antara atom-atom besi.

    D To decrease the magnetic properties of the iron atoms

    Untuk mengurangkan sifat magnet bagi atom-atom besi.

    23. The information below shows the industrial products made from substance P.

    Maklumat berikut menunjukkan hasil industri yang diperbuat daripada bahan P.

    Nitric acid

    Asid nitrik

    Cleaning agent

    Agen pencuci

    Explosives

    Bahan letupan

    What is P?

    Apakah P?

    A Ethanol

    Etanol

    B Ammonia

    Ammonia

    C Sulphur

    Sulfur

    D Sulphuric acidAsid sulfurik

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    24. Diagram 16 shows a type of microorganism which grows on the surface of bread.

    What group of microorganism is this?

    Rajah 16 menunjukkan sejenis mikroorganisma yang tumbuh pada permukaan roti.

    Apakah kumpulan mikroorganisma ini?

    Diagram 16

    Rajah 16

    A Bacteria

    Bakteria.

    B Virus.

    Virus

    C Algae.

    Alga

    D Fungi

    Kulat.

    25. Diagram 17 shows an apparatus set-up to study the growth of microorganisms.

    Rajah 17 menunjukkan susunan radas untuk mengkaji pertumbuhan mikroorganisma.

    Diagram 17

    Rajah 17

    Two Petri dishes are prepared as shown in Diagram 17. These Petri dishes are kept in a

    cupboard and under the sun respectively.

    What is the factor investigated in this experiment?

    Dua piring Petri disediakan seperti ditunjukkan dalam Rajah 17. Piring-piring Petri inimasing-masing diletakkan di dalam almari dan di bawah sinaran matahari.

    Apakah faktor yang dikaji dalam eksperimen ini?

    A Light

    Cahaya

    B Humidity

    Kelembapan

    C Temperature

    Suhu

    D pH

    pH

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    26. Which of the following is not an importance of microorganisms to human?

    Manakah yang berikutbukan kepentingan mikroorganisma kepada manusia?

    A They are used for baking bread.

    Ia digunakan dalam pembuatan roti.

    B They decompose waste materials.

    Ia menguraikan bahan buanganC They are used in producing vaccines.

    Ia digunakan dalam penghasilan vaksin.

    D They are used to make antiseptic.

    Ia digunakan dalam pembuatan antiseptik.

    27. Which of these substances can treat diseases caused by bacteria?

    Manakah antara bahan berikut dapat merawat penyakit yang disebabkan oleh bakteria?

    A Antifungal

    Antikulat

    B AntibioticAntibiotik

    C Antitoxin

    Antitoksin

    D Antigen

    Antigen

    28. Table 3 shows the types and quantities of food taken by Shafiq for his breakfast.

    Jadual 3 menunjukkan jenis dan kuantiti makanan yang diambil oleh Shafiq untuk

    sarapannya.

    Type of food

    Jenis makanan

    Quantity / g

    Kuantiti / g

    Energy / kJ per 100 g

    Tenaga / kJ setiap 100 g

    Bread

    Roti100 1 060

    Milk

    Susu150 270

    Eggs

    Telur50 660

    Butter

    Mentega30 3 120

    Table 3

    Jadual 3

    Calculate the total energy taken by him that morning.

    Hitung jumlah tenaga yang diambil olehnya pada pagi itu.

    A 1 820 kJ.

    B 2 731 kJ.

    C 2 750 kJ.

    D 2 800 kJ.

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    29. Diagram 18 shows an experiment to study the healthy growth of a maize plant.

    Rajah 18 menunjukkan suatu eksperimen untuk mengkaji pertumbuhan yang sihat bagi

    satu anak jagung.

    Diagram 18

    Rajah 18

    Which of the following will spoil the growth of the maize plant?

    Manakah antara berikut yang boleh menjejaskan pertumbuhan anak jagung?

    A Wrap the boiling tube with black paper.

    Tabung didih dibalut dengan kertas hitam.

    B Put the boiling tube in a closed cupboard.

    Tabung didih diletakkan di dalam almari tertutup.

    C Replaces the Knop's solution every week.

    Menukar larutan Knop setiap minggu.

    D Air the solution all the time.Pengudaraan larutan pada setiap masa.

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    30. Diagram 19 shows the roots of a leguminous plant.

    Rajah 19 menunjukkan akar tumbuhan kekacang.

    Diagram 19

    Rajah 19

    Which bacteria is found in Q?

    Apakah bakteria yang ditemui dalam Q?

    A Nitrifying bacteria

    Bakteria penitritan

    B Putrefying bacteria

    Bakteria pengurai

    C Denitrifying bacteria

    Bakteria pendenitritan

    D Nitrogen-fixing bacteria

    Bakteria pengikat nitrogen

    31. Diagram 20 shows a pond community.

    Rajah 20 menunjukkan komuniti sebuah kolam.

    Diagram 20

    Rajah 20

    Which of the following are producers in this community?

    Manakah antara berikut merupakan pengeluar dalam komuniti ini?

    A P and Q only

    P dan Q sahaja

    B P and R only

    P dan R sahaja

    C Q and R only

    Q dan R sahaja

    D P, Q and R

    P, Q dan R

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    32. The exhaust gases from motor vehicles contain several harmful gases.

    Which gas can cause death by depriving a person of oxygen?

    Gas ekzos daripada kenderaan bermotor mengandungi gas berbahaya.

    Manakah gas yang boleh menyebabkan kematian akibat kekurangan oksigen dalam badan

    seseorang?

    A Nitrogen dioxideNitrogen dioksida

    B Carbon monoxide

    Karbon monoksida

    C Sulphur dioxide

    Sulfur dioksida

    D Lead fumes

    Asap plumbum

    33. The excessive use of pesticides is a threat to human health.

    Which is the most effective method to overcome this threat?

    Penggunaan racun makhluk perosak merupakan ancaman kepada kesihatan manusia.Manakah kaedah paling efektif untuk mengatasi masalah ancaman tersebut?

    A Rear natural predators of the pests

    Memelihara pemangsa semulajadi kepada perosak

    B Destroy pests using chemicals

    Memusnahkan perosak menggunakan bahan kimia

    C Destroy the habitat of pests

    Memusnahkan habitat perosak

    D Use organic fertilisers

    Menggunakan baja organik

    34. Diagram 21 shows a human activity.

    Rajah 21 menunjukkan satu aktiviti manusia.

    Diagram 21

    Rajah 21

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    What are the problems resulting from the activity shown in Diagram 21?

    Apakah masalah yang berpunca daripada aktiviti ditunjukkan dalam Rajah 21?

    I Soil erosion

    Hakisan tanah

    II The greenhouse effectKesan rumah hijau

    III Flash flood

    Banjir kilat

    A I and II only

    I dan II sahaja

    B I and III only

    I dan III sahaja

    C II and III only

    II dan III sahaja

    D I, II and IIII, II dan III

    35. Which of these substances is the source of hydrocarbon?

    Manakah antara bahan berikut merupakan sumber hidrokarbon?

    A Coal

    Arang batu

    B Ethanol

    Etanol

    C Gasohol

    Gasohol

    D Thiokol

    Tiokol

    36. Diagram 22 shows an experiment set up to produce ethanol from glucose solution and

    yeast.

    Rajah 22 menunjukkan satu eksperimen yang disediakan untuk menghasilkan etanol

    daripada larutan glukosa dan yis.

    Diagram 22

    Rajah 22

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    What will happen to limewater after 30 minutes?

    Apakah yang berlaku kepada air kapur selepas 30 minit?

    A Turn cloudy

    Berubah menjadi keruh

    B Turn to yellowBerubah menjadi kuning

    C Turn colourless

    Berubah menjadi tidak berwarna

    D Form red precipitate

    Membentuk mendakan merah

    37. Diagram 23 shows a soap molecule.

    Rajah 23 menunjukkan molekul sabun.

    Diagram 23

    Rajah 23

    Which of the following describes J and K correctly?

    Manakah di antara berikut adalah benar tentang J dan K?

    J K

    Part

    Bahagian

    Solubility in

    Larut di dalam

    Part

    Bahagian

    Solubility in

    Larut di dalamA Ionic

    Ionik

    Water

    AirHydrocarbon

    Hidrokarbon

    Grease

    Gris

    B HydrocarbonHidrokarbon

    Grease

    Gris

    Ionic

    Ionik

    Water

    Air

    C HydrocarbonHidrokarbon

    Water

    AirHydrocarbon

    Hidrokarbon

    Water

    Air

    D Ionic

    Ionik

    Grease

    Gris

    Ionic

    Ionik

    Grease

    Gris

    38. Diagram 24 shows a polymer breaking down into monomers.

    Rajah 24 menunjukkan penguraian polimer kepada monomer.

    Diagram 24

    Rajah 24

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    What is polymer X?

    Apakah polimer X?

    A Starch

    Kanji

    B Protein

    ProteinC Silk

    Sutera

    D Wool

    Kapas

    39. Diagram 25 shows a stage in a four stroke petrol engine.

    Rajah 25 menunjukkan satu peringkat di dalam enjin petrol empat lejang.

    Diagram 25

    Rajah 25

    What is the stage shown in Diagram 25?

    Apakah peringkat yang ditunjukkan dalam Rajah 25?

    A Exhaust stroke

    Lejang ekzos

    B Power strokeLejang kuasa

    C Intake stroke

    Lejang pengambilan

    D Compression stroke

    Lejang mampatan

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    SULIT 21 1511/1

    [Lihat sebelah

    1511/1 2009 Hak Cipta Jabatan Pelajaran Sabah SULIT

    40. The initial velocity of a car is 20 ms-1

    . It then accelerates to 10 ms-2

    in 3 seconds.

    Calculate the final velocity of the car.

    [ Acceleration =Final velocity Initial velocity

    ]Time

    Halaju sebuah kereta adalah 20 ms-1

    . Ia kemudiannya memecut sehingga 10 ms-2

    dalam

    masa 3 saat..Kira halaju akhir kereta tersebut.

    [ Pecutan =Halaju Akhir Halaju Awal

    ]Masa

    A 60 ms-1

    B 50 ms-1

    C 30 ms-1

    D 0 ms-1

    41. Diagram 26 shows the passengers being thrown forward when the bus suddenly stops.

    Rajah 26 menunjukkan penumpang terhumban ke hadapan apabila bas dihentikan secara

    tiba-tiba.

    Diagram 26

    Rajah 26

    What causes the phenomenon in Diagram 26?

    Apakah yang menyebabkan fenomena di dalam Rajah 26 ?

    A Force

    Daya

    B Inertia

    Inersia

    C Pressure

    Tekanan

    D MomentumMomentum

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    42. Diagram 27 shows a hydraulic jack.

    Rajah 27 menunjukkkan satu jek hidraulik.

    Diagram 27

    Rajah 27

    How much force must be applied on piston X so that piston Y can push up the load of

    3000 N?

    [ Pressure =Force

    ]Surface Area

    Berapakah daya yang dikenakan ke atas omboh X supaya omboh Y dapat mengangkat

    beban seberat 3000 N?

    [ Tekanan =Daya

    ]Luas permukaan

    A 50 N

    B 100 N

    C 150 N

    D 300 N

    43. Which of these shapes is most suitable to make water vehicles?

    Manakah bentuk yang paling sesuai untuk membuat kenderaan air?

    A

    B

    C

    D

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    SULIT 23 1511/1

    [Lihat sebelah

    1511/1 2009 Hak Cipta Jabatan Pelajaran Sabah SULIT

    44. Which of the following chemical substances is used in processed food to make the food

    tastier and delicious?

    Manakah di antara bahan kimia berikut digunakan di dalam pemprosesan makan untuk

    menjadikan makanan lebih sedap dan enak?

    A Stabilizer

    Penstabil

    B Preservative

    Pengawet

    C Flavouring

    Perisa

    D Antioxidant

    Pengantioksida

    45. A farmer has a mango plant which produces big and sweet fruits. He intends to produce alarge quantity of mango seedlings in a short period from the mango plant in his orchard.

    Which method should he use?

    Seorang petani mempunyai pokok mangga yang menghasilkan buah yang besar dan

    manis. Dia berhasrat untuk menghasilkan anak pokok mangga di dalam tempoh yang

    singkat daripada pokok mangga daripada kebunnya itu.

    Apakah kaedah yang patut digunakannya?

    A Cloning

    Pengklonan

    B Bud grafting

    Cantuman tunas (tut)

    C Stem cutting

    Keratan batang

    D Germination of seeds

    Percambahan biji benih

    46. Which of the following is a synthetic polymer?

    Manakah di antara berikut merupakan polimer sintetik?

    A IsopreneIsoprena

    B Neoprene

    Neoprena

    C Sucrose

    Sukrosa

    D Cellulose

    Selulosa

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    47. Diagram 28 shows the structure of a plastic

    Rajah 28 menunjukkan struktur suatu plastik.

    .

    Diagram 28

    Rajah 28

    Which plastic has the above structure?

    Manakah plastik yang mempunyai struktur di atas?

    A. Perspex

    PerspekB Polystyrene

    Polistirena

    C Bakelite

    Bakelit

    D Polyvinyl chloride

    Polivinil klorida

    48. Diagram 29 shows a wave form.

    Rajah 29 menunjukkan satu bentuk gelombang.

    Diagram 29

    Rajah 29

    What is the velocity of the wave if its frequency is 10 Hz?

    [ Velocity = Frequency x Wavelength ]

    Apakah halaju gelombang tersebut jika frekuensinya adalah 10 Hz?

    [ Halaju = Frekuensi x Panjang Gelombang ]

    A 1.0 ms-1

    B 2.0 ms-1

    C 3.0 ms-1

    D 4.0 ms-1

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    SULIT 25 1511/1

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    49. Diagram 30 shows a radio transmitter system.

    Rajah 30 menunjukkan satu sistem pemancar radio.

    Diagram 30

    Rajah 30

    Which of the following is used for generating radio waves?

    Manakah antara berikut digunakan di dalam penjanaan gelombang radio?

    A Aerial

    Arial

    B Oscillator

    Pengayun

    C Modulator

    ModulatorD Microphone

    Mikrofon

    50. Why is a communication satellite geostationary?

    Mengapakah satelit komunikasi adalah geopegun?

    A It is attracted by the gravity of the Earth.

    Ia ditarik oleh graviti bumi.

    B It is located above the equator of the Earth.

    Ia terletak di atas khatulistiwa bumi.

    C It appears stationary when viewed from the Earth.Ia kelihatan pegun apabila dilihat dari bumi.

    D It makes one complete orbit round the Earth every day.

    Ia membuat satu putaran lengkap mengelilingi bumi dalam satu hari.

    END OF QUESTION PAPER

    KERTAS SOALAN TAMAT

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    Excel 2 SPM

    SCIENCE

    Kertas 1

    September 2009

    ANSWER

    1 C 11 D 21 A 31 B 41 B

    2 C 12 C 22 A 32 B 42 B

    3 A 13 D 23 B 33 A 43 C

    4 B 14 B 24 D 34 D 44 C

    5 A 15 C 25 A 35 A 45 A

    6 B 16 A 26 D 36 A 46 B

    7 A 17 B 27 B 37 A 47 C

    8 D 18 C 28 B 38 B 48 B

    9 D 19 D 29 B 39 B 49 B

    10 C 20 B 30 D 40 B 50 C

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    Nama : .. Kelas : .

    Excel 2 SPM

    SCIENCE

    Kertas 2

    Sept 2009

    2 jam Dua jam tiga puluh minit

    SAINSKERTAS 2

    JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU

    Kegunaan Pemeriksa

    Kod Pemeriksa :

    Bahagian SoalanMarkah

    Penuh

    Markah

    Diperoleh

    A1 52 5

    3 5

    4 5

    B

    5 6

    6 6

    7 6

    8 6

    9 6

    C

    10 10

    11 1012 10

    Jumlah

    Kertas soalan ini mengandungi 21 halaman bercetak.

    [Lihat sebelah1511/2 2009 Hak Cipta Jabatan Pelajaran Sabah SULIT

    1. Tulis nama, kelas, angka

    giliran, dan nombor kad

    pengenalan anda padaruangan yang disediakan.

    2. Kertas soalan ini adalah dalam

    dwibahasa.

    3. Soalan dalam Bahasa Inggeris

    mendahului soalan yang

    sepadan dalam Bahasa Melayu.

    4. Calon dibenarkan menjawab

    keseluruhan atau sebahagian

    soalan sama ada dalam Bahasa

    Inggeris atau Bahasa Melayu.

    5. Calon dikehendaki membacamaklumat di halaman belakang

    kertas soalan ini.

    JABATAN PELAJARAN SABAH

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    SULIT

    [Lihat sebelah

    1511/2 2009 Hak Cipta Jabatan Pelajaran Sabah SULIT

    2

    Section A

    Bahagian A

    [20 marks]

    [20 markah]

    Answer all the questions in this section.

    Jawab semua soalan dalam bahagian ini.

    1. Diagram 1 shows an experiment to study the resistance of iron nail and stainless steel nail (an

    alloy) to corrosion.

    Rajah 1 menunjukkan satu eksperimen untuk mengkaji rintangan paku besi dan paku keluli

    tahan karat (suatu aloi) ke atas kakisan.

    Diagram 1Rajah 1

    Both test tubes with their contents are left for three days and the results of the experiment are

    as shown in Table 1.

    Kedua-dua tabung uji dan kandungannya dibiarkan selama tiga hari dan keputusan

    eksperimen ditunjukkan dalam Jadual 1.

    Type of nail

    Jenis paku

    Observation

    Pemerhatian

    Iron nail

    Paku besi

    Stainless steel nail

    Paku keluli tahan karat

    Table 1

    Jadual 1

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    SULIT

    [Lihat sebelah

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    3

    (a) Complete Table 1 with the following information :

    Lengkapkan Jadual 1 dengan maklumat berikut :

    Rust

    Berkarat

    No rust

    Tidak berkarat[1 mark]

    [1 markah]

    (b) State one inference to explain the observations made in Table 1.

    Nyatakan satu inferens untuk menjelaskan pemerhatian yang dibuat dalam Jadual1.

    [1 mark]

    [1 markah](c) State the operational definition of an alloy.

    Nyatakan definisi secara operasi bagi aloi.

    [1 mark]

    [1 markah]

    (d) Tick ( ) the objects that rust in sodium chloride solution.Tandakan ( ) objek yang akan berkarat dalam larutan natrium klorida.

    Iron scissors Steel hammer Steel lock Iron key

    [1 mark]

    [1 markah]

    (e) What can be observed when the test tube containing iron nail is left for four weeks?

    Apakah yang akan diperhatikan apabila tabung uji yang mengandungi paku besi

    dibiarkan selama empat minggu ?

    [1 mark]

    [1 markah]

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    SULIT

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    4

    2 Diagram 2 shows an experiment to study the relationship between the object distance and the

    size of the image formed on the screen of a pin-hole camera.

    Rajah 2 menunjukkan satu eksperimen untuk mengkaji hubungan di antara jarak objek dan

    saiz imej yang terbentuk di atas skrin kamera lubang jarum.

    Diagram 2

    Rajah 2

    Table 2 shows the results of the experiment.

    Jadual 2 menunjukkan keputusan eksperimen ini.

    Object distance (cm) 10 8 6 4 2

    Size of the image (cm) 0.5 1.0 2.0 2.5

    Table 2

    Jadual 2

    (a) Complete Table 2 by measuring the size of the image formed in Diagram 2.

    Lengkapkan Jadual 2 dengan mengukur saiz imej yang terbentuk dalam Rajah 2.

    [1 mark]

    [1 markah]

    (b) State one characteristic of the image formed in Diagram 2.

    Nyatakan satu ciri imej yang terbentuk dalam Rajah 2.

    [1 mark]

    [1 markah]

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    SULIT

    [Lihat sebelah

    1511/2 2009 Hak Cipta Jabatan Pelajaran Sabah SULIT

    5

    (c) Using the data in Table 2, draw a graph of the size of the image against the object

    distance.

    Menggunakan data dalam Jadual 2, lukiskan graf saiz imej melawan jarak objek.

    [2 marks]

    [2 markah]

    (d) State one hypothesis for this experiment.

    Nyatakan satu hipotesis untuk eksperimen ini.

    [1 mark]

    [1 markah]

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    SULIT

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    6

    3 Diagrams 3.1 and 3.2 shows an experiment to study the relationship between uphtrust and the

    weight of the water that is displaced.

    Rajah 3.1 dan Rajah 3.2 menunjukkan satu eksperimen untuk mengkaji hubungan di antara

    tujahan dan berat air yang disesarkan.

    Diagram 3.1

    Rajah 3.1

    Diagram 3.2 Rajah 3.2

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    SULIT

    [Lihat sebelah

    1511/2 2009 Hak Cipta Jabatan Pelajaran Sabah SULIT

    7

    The results are as shown in Table 3.

    Keputusan ditunjukkan dalam Jadual 3.

    Set of experiment

    Set eksperimen

    In air

    Dalam

    udara

    In water

    Dalam

    air

    Difference in weight (N)

    Perbezaan dalam berat

    (N)

    Reading of spring balance (N)

    Bacaan neraca spring (N)1.8

    Reading of mechanical weighing scale (N)

    Bacaan penimbang skala mekanikal (N)0 0.6 0.6

    Table 3

    Jadual 3

    (a) Based on Diagram 3.2, write the reading of spring balance in Table 3.

    Berdasarkan Rajah 3.2, tuliskan bacaan neraca spring dalam Jadual 3.[1 mark]

    [1 markah]

    (b) State the variables in this experiment.

    Nyatakan pembolehubah dalam eksperimen ini.

    (i) Constant variable

    Pembolehubah dimalarkan

    (ii) Responding variablePembolehubah bergerakbalas

    [2 marks]

    [2 markah]

    (c) Based on Table 3, state the relationship between upthrust and the weight of the water

    that is displaced.

    Berdasarkan Jadual 3 , nyatakan hubungan di antara tujahan dan berat air yang

    disesarkan.

    [1 mark]

    [1 markah]

    (d) Tick ( ) the vehicles that use this principle.Tanda ( ) kenderaan yang menggunakan prinsip ini.

    Aeroplane

    Kapal terbang

    Submarine

    Kapal selam

    Ship

    Kapal laut

    Tank

    Kereta kebal

    [1 mark]

    [1 markah]

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    SULIT

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    1511/2 2009 Hak Cipta Jabatan Pelajaran Sabah SULIT

    8

    4 Diagram 4 shows an experiment to compare the effect of acid and alkali on latex.

    Rajah 4 menunjukkan satu eksperimen untuk membandingkan kesan asid dan alkali ke atas

    lateks.

    Diagram 4

    Rajah 4

    The result are as shown in Table 4.

    Keputusan eksperimen ditunjukkan dalam Jadual 4.

    Set of the experiment

    Set eksperimen

    Observation

    Pemerhatian

    ALatex coagulated

    Lateks menggumpal

    BLatex does not coagulate

    Lateks tidak menggumpal

    CLatex coagulated

    Lateks menggumpal

    Table 4

    Jadual 4

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    SULIT

    [Lihat sebelah

    1511/2 2009 Hak Cipta Jabatan Pelajaran Sabah SULIT

    9

    (a) State the hypothesis for this experiment.

    Nyatakan hipotesis bagi eksperimen ini.

    [1 mark]

    [1 markah]

    (b) State the variables in this experiment.

    Nyatakan pembolehubah dalam eksperimen ini.

    (i) Constant variable

    Pembolehubah dimalarkan

    (ii) Manipulated variable

    Pembolehubah dimanipulasi

    [2 marks]

    [2 markah]

    (c) Based on this experiment, what causes latex in beaker C to coagulate ?

    Berdasarkan eksperimen ini, apakah yang menyebabkan lateks dalam bikar C

    menggumpal?

    [1 markah]

    (d) After one day, excess hydrochloric acid is added to the beaker in Set B.

    What observation can be made about the latex?

    Selepas satu hari, asid hidroklorik berlebihan di tambah ke dalam bikar dalam

    Set B. Apakah pemerhatian yang boleh dibuat mengenai lateks ini ?

    [1 mark][1 markah]

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    SULIT

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    10

    Section B

    Bahagian B

    [30 marks]

    [30 markah]

    Answerall questions in this section.

    Jawab semua soalan dalam bahagian ini.

    5. Diagram 5 shows the inheritance of colour blindness in human.

    Rajah 5 menunjukkan pewarisan sifat buta warna dalam manusia.

    Diagram 5

    Rajah 5

    (a) Complete the above Diagram 5.

    Lengkapkan Rajah 5.

    [2 marks][2 markah]

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    SULIT

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    11

    (b) What is the probability of having:

    Apakah kemungkinan untuk mendapat :

    i. Colour-blind son

    Lelaki buta warna : .....

    ii. Normal daughter but carrier

    Perempuan normal tetapi pembawa: ..

    [2 marks]

    [2 markah]

    (c) Colour-blindess known as a sex-linked heredity diseases . State the reason.

    Buta warna dikenali sebagai penyakit baka terangkai seks. Nyatakan sebabnya.

    [1 mark]

    [1 markah]

    (d) Name one other example of sex-linked heredity diseases.

    Namakan satu contoh lain penyakit baka terangkai seks.

    [1 mark]

    [1 markah]

    6. Diagram 6 shows the position of some endocrine glands in humans.

    Gambarajah 6 menunjukkan kedudukan kelenjar endokrin dalam badan manusia.

    Diagram 6

    Rajah 6

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    SULIT

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    12

    (a) Name the glands B and D in Diagram 6.

    Namakan kelanjar B dan D dalam Diagram 6.

    B: ..

    D: ..

    [2 marks]

    [2 markah]

    (b) i. What is the function of hormone produced by glands C ?

    Apakah fungsi hormon yang dihasilkan oleh kelenjar C?

    ii. State the effect of hormone deficiency produced by gland C?

    Nyata kesan kekurangan hormon yang dihasilkan oleh kelenjar C?

    [2 marks]

    [2 markah]

    (c) How are hormones that produced by the glands in Diagram 6 transported in the body?

    Bagaimanakah hormon yang dihasilkan oleh kelanjar-kelanjar dalam Rajah 6 diangkut

    dalam badan?

    [1 mark]

    [1 markah]

    (d) Which gland act as the main endocrine gland?

    Kelenjar manakah yang bertindak sebagai kelenjar endokrin utama?

    [1 mark]

    [1 markah]

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    SULIT

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    13

    7. Diagram 7 shows a process that occurs in nuclear reactor.

    Rajah 7 menunjukkan suatu proses yang berlaku di mana reaktor nuklear.

    Diagram 7

    Rajah 7

    (a) Name the type of nuclear reaction shown in Diagram 7.

    Namakan jenis tindak balas nuklear yang ditunjukkan pada Rajah 7.

    [1 mark]

    [1 markah]

    (b) What is the function of the control rods?

    Apakah fungsi rod pengawal?

    [1 mark]

    [1 markah]

    (c) What is the radioactive element used in Diagram 7 to produce nuclear energy. Apakah bahan radiaktif yang digunakan dalam Rajah 7 untuk menghasilkan tenaga

    nuklear.

    [1 mark]

    [1 markah]

    (d) Name the part that control the temperature of the reactor in Diagram 7.

    Namakan bahagian yang mengawal suhu reaktor dalam Rajah 7.

    [1 mark]

    [1 markah]

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    14

    (e) State two advantages of using nuclear energy.

    Berikan dua kebaikan penggunaan tenaga nuklear.

    1. ...

    2. ...

    [2 marks]

    [2 markah]

    8. Diagram 8 shows an environmental phenomenon caused by chemical substance,

    chlorofluorocarbons ( CFCs) on layer X.

    Rajah 8 menunjukkan fenomena alam sekitar disebabkan bahan kimia, klorofluorokarbon

    (CFC) ke atas lapisan X.

    Rajah 8

    Diagram 8

    (a) What happened to layer X?

    Apa yang berlaku kepada lapisan X ?

    [1 mark]

    [1 markah]

    (b) Name ray Q in Diagram 8.

    Namakan sinar Q dalam Rajah 8.

    [1 mark]

    [1 markah]

    (c) State the main function of layer X.

    Nyatakan fungsi utama lapisan X.

    [1 mark]

    [1 markah]

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    15

    (d) Give one negative effect of ray Q on humans and plants.

    Beri satu kesan negative sinar Q ke atas manusia dan tumbuhan.

    i. Human

    Manusia

    ii. Plants

    Tumbuhan

    [2 marks]

    [2 markah]

    (e) Mark ( ) the objects below that contribute to the above environmental phenomenon.Tandakan ( ) objek-objek di bawah menyumbang kepada fenomena alam sekitar diatas.

    Television

    Televisyen

    Refrigerator

    Peti sejuk

    Microwave oven

    Ketuhar mikro

    Aerosol spray

    Penyembur Aerosol

    [1 mark]

    [1markah]

    9. Diagram 9 shows the types of food that need to be kept in a proper place before it could be

    used by consumers.

    Rajah 9 menunjukkan beberapa jenis makanan yang perlu disimpan di dalam tempat yangsesuai sebelum ianya boleh digunakan oleh pengguna.

    Diagram 9

    Rajah 9

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    SULIT

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    16

    (a) i. What is the best method to preserve of foods shown in Diagram 9?

    Apakah kaedah terbaik untuk menyimpan makanan yang ditunjukkan dalam

    Rajah 9?

    ii. What is the range of optimum temperature for the method stated in 9(a)i. ?

    Apakah julat suhu optima bagi kaedah yang dinyatakan pada 9 (a)i. ?

    [2 marks]

    [2 markah]

    (b) State one advantage of this method.

    Nyatakan satu kelebihan kaedah ini.

    [1 mark][1 markah]

    (c) The following diagram shows three types of processed food.

    Rajah berikut menunjukkan tiga jenis makanan yang diproses.

    State the method used to process the foods.

    Nyatakan kaedah yang digunakan untuk memproses makanan tersebut.

    X : ..........................................................................................................................................

    Y : ..........................................................................................................................................

    Z : ..........................................................................................................................................

    [3 marks]

    [3 markah]

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    SULIT

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    17

    Section C

    Bahagian C

    [20 marks]

    [20 markah]

    Answer Question 10 and either Question 11 or Question 12.

    Jawab Soalan 10 dan sama ada Soalan 11 atau Soalan 12.

    10 Study the following statement :

    Kaji pernyataan berikut:

    (a) Suggest one hypothesis to investigate the above statement.

    Cadangkan satu hipotesis untuk mengkaji pernyataan di atas.

    [1 mark]

    [1 markah]

    (b) Using two pieces of fresh bread, oven and other apparatus, describe an experiment to

    test your hypothesis in 10(a) based on the following criteria :

    Dengan menggunakan dua keping roti yang segar, ketuhar dan radas lain, huraikansatu eksperimen untuk menguji hipotesis di 10(a) berdasarkan kriteria berikut :

    i. Aim of the experiment [1 mark]

    Tujuan eksperimen [1 markah]

    ii. Identification of variables [2 marks]

    Mengenalpasti pembolehubah [2 markah]

    iii. List of material and apparatus [1 mark]

    Senarai bahan dan radas [1 markah]

    iv. Procedure [4 marks]

    Prosedur [4 markah]

    v. Tabulation of data [1 mark]

    Penjadualan data [1 markah]

    Humidity is essential for microorganisms growth on any suitable medium.

    Kelembapan adalah perlu untuk pertumbuhan mikroorganisma pada

    sebarang medium yang sesuai.

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    SULIT

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    1511/2 2009 Hak Cipta Jabatan Pelajaran Sabah SULIT

    18

    11. (a) Explain the importance of taking good nutrition and practicing good eating habits.

    Terangkan kepentingan pengambilan pemakanan dan mengamalkan tabiat pemakanan

    yang baik.

    [4 marks]

    [4 markah]

    (b) You are an obese teenager. You are advised by your doctor to have a balanced diet

    suitable for you. You have three types of menu, Menu A, B or C as shown in Table

    11 to be chosen for your dinner.

    Anda adalah seorang remaja yang gendut. Anda telah dinasihatkan oleh doktor untuk

    mengambil makanan yang seimbang bersesuaian dengan anda. Anda mempunyai tiga

    jenis menu, Menu A, B, dan C seperti yang ditunjukkan dalam Jadual 11 untuk dipilih

    bagi makan malam anda.

    Menu

    Menu

    Contents

    Kandungan

    Total Energy (kJ)

    Jumlah Tenaga (kJ)

    A

    A plate of rice, fried chicken, fried mee, a glass

    of non-fat milk and a banana.

    Sepinggan nasi, ayam goreng, mee goreng,

    segelas susu tanpa lemak, dan sebiji pisang.

    6158

    B

    Two pieces of butter bread, fried mix

    vegetables with prawns, a bowl of egg soup, a

    glass of full cream milk and an orange.

    Dua keping roti mentega, sayur campur goreng

    udang, semangkuk sup telur, segelas susu

    penuh krim, dan sebiji oren.

    4750

    C

    A small bowl of rice, mix bean-vegetables

    soup, steamed fish, a glass of lemon juice and a

    piece of papaya.

    Semangkuk kecil nasi, sup sayur campuran

    kekacang, ikan stim, segelas jus lemon, dan

    sepotong betik.

    4550

    Table 11

    Jadual 11

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    SULIT

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    19

    Choose the most suitable menu for your dinner as advised by your doctor.

    Pilih menu yang paling sesuai untuk makan malam anda seperti yang dinasihatkan

    oleh doctor anda .

    Explain your choice based on the following aspects:

    Terangkan pilihan anda berdasarkan aspek-aspek berikut :

    i. Aim of choice

    Tujuan pilihan

    [3 marks]

    [3 markah]

    ii. Explanation on the advantages of each menu based on the food class and its

    function or the total energy calculated for the menu.

    Penerangan tentang kelebihan setiap menu berdasarkan kelas makanan dan dan

    juga pada jumlah tenaga yang telah dihitung bagi menu itu.

    [3 marks][3 markah]

    iii. List of types of menu according to its priority .

    Senarai jenis menu mengikut keutamaan.

    [1 mark]

    [1 markah]

    iv. The reason for your choice.

    Sebab kepada pemilihan anda .

    [1 mark]

    [1 markah]

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    SULIT

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    20

    12 (a) State two differences between atomic elements and ionic compounds.

    Give one example of an atomic elements and ionic compunds.

    Nyatakan dua perbezaan antara unsur atom dan sebatian ion.

    Beri satu contoh unsur atom dan sebatian ion.

    [4 marks]

    [4 markah]

    (a) Diagram 12 shows four examples of molecular substances.

    Rajah 12 menunjukkan empat contoh bahan molekul.

    Diagram 12

    Rajah 12

    Study the examples in diagram 12 and construct the concept of molecular substances.

    Kaji contoh-contoh dalam Rajah 12 dan bina konsep bahan molekul.

    Your answer should be based on the following aspects:Jawapan anda hendaklah berdasarkan aspek-aspek berikut:

    Identify two common characteristics

    Kenal pasti dua ciri sepunya

    [2 marks]

    [2 markah]

    Give one other example of molecular substances

    Beri satu contoh lain bagi bahan molekul

    [1 mark]

    [1 markah]

    Give one example of non-molecular substances and the reason for your choice.

    Beri satu contoh bukan bahan molekul dan sebab kepada pemilihan anda

    [2 marks]

    [2 markah]

    State the actual concept of molecular substances.

    Nyatakan konsep sebenar bahan molekul.

    [1 mark]

    [1 markah]

    END OF QUESTION PAPERKERTAS SOALAN TAMAT

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    Paper 2 Scince Excel 2, SEPTEMBER 2009

    MARKING SCHEME

    SECTION A ( 20 MARKS )

    Q MARKING CRITERIA MARK

    1

    (a)

    Type of nail Observation

    Iron nail Rust

    Stainless steel nail No Rust1

    (b) A stainless steel nail is more resistant to corrosion than an iron nail. 1

    (c) Alloy is a material which is more resistance to corrosion compared to pure metals 1

    (d) Iron scissors Iron key

    1

    (e) More rust is formed 1

    TOTAL 5M

    2 (a) 1.5 cm 1

    (b) Real // inverted 1

    (c)

    NOTE: All points transferred correctly 1m

    Smooth line graph - 1m

    2

    (d) The larger the object distance, the smaller the size of the image formed 1

    TOTAL 5M

    3 (a) 1.2 N 1

    (b) (i) The stone(ii) The weight of the stone

    2

    (c) upthrust = weight of the water that is displaced 1

    (d) Tick () both submarine and ship 1

    TOTAL 5M

    4 (a) Acids cause the latex to coagulate whereas alkalis prevent the latex from coagulating 1

    (b) (i) volume of latex

    (ii) Addition of acid or alkali or none

    2

    (c) Latex in beaker C contains acid produced by bacteria / in the growth of bakteria 1

    (d) Latex coagulates immediately 1

    TOTAL 5M

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    SECTION B: 30 marks

    No Marking Criteria Mark

    5 a

    Note : 1. Gametes all correct 1 mark

    2. Offspring all correct 1 mark1

    1

    b i. 25% /

    ii. 25% /

    1

    1

    c Recessive gene ( for colour blindness) found on the human X chromosome. 1

    d Haemophilia / Thalassamiea 1

    TOTAL 6M

    6a B : Thyroid (gland)

    D : Adrenal (gland)

    1

    1

    b i.To control glucose level ( in the body )

    ii.Diabetes (mellitus)

    1

    1

    c Bloodstream 1

    d Pituitary ( gland ) 1

    TOTAL 6M

    7a To maintain steady rate of fission 1

    b To control the rate of nuclear fission by absorbing neutrons 1

    c Uranium 1

    d Condensor cooling water // Cooling system 1

    e Produce electrical energy //Cheap source of energy // less accident happened / / produced huge

    amount of energy /a lot of useful radioisotopes

    Note : Accept any two correct answer

    2

    TOTAL 6M

    8a Formation of hole /depletion of layer X 1

    b Ultraviolet rays 1

    c To prevent from ultraviolet rays ( from reaching the Earth ) 1

    e Humans : Skin cancer / cataract / eyes diseases / lower immune system

    Plants : Reduce the rate of photosynthesis / reduce production of crops

    1

    1

    d Mark ( ) refrigerator and aerosol 1

    TOTAL 6M

    9a i. Cooling

    ii. 0 10 C

    1

    1

    b Prevent the growth of microorganism / food spoilage 1

    c X : Pasteurisation

    Y : Drying

    Z : Canning

    1

    1

    1

    TOTAL 6M

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    Paper 2 Science EXCEL 2 - 2009 MARKING SCHEME

    SCIENCE PAPER 2

    SECTION C

    Question Marking Criteria Mark

    10.(a) Hypothesis :

    Microorganisms need humidity / water to grow //

    Humidity is essential for microorganisms growth .

    1 mark

    10.(b) Aim :

    To investigate that microorganisms need humidity for growth.

    Identification of variables :

    Constant variable : Type of bread/

    Place where pieces of bread are kept

    Manipulated variable : Presence of water (in bread) / Humidity

    Responding variable : Growth of microorganisms /

    Presence of microorganisms

    Materials & apparatus

    Two pieces of fresh bread, Petri dish and oven

    Procedure

    1. The fresh breads is put into the Petri dish and labeled as A and B.

    2. Bread A is put into the oven to dry it whereas bread B is not.

    3. Both bread will be left on the table.

    4. Observation is done after 2-3 days and recorded.

    Tabulation of data

    Presence of water in bread Presence/ Growth of

    microorganisms

    Presence of water

    Absent of water

    1 mark

    2 marks

    1 mark

    4 mark

    1 mark

    Total 10 marks

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    Question Marking Criteria Mark

    11.(a) Taking good nutrition and practising good eating habits

    are important because we :-

    want to avoid being over nourished which may lead to obesity. want to

    stay healthy by having a balanced diet.

    want to avoid being malnourished

    want to avoid diseases like scurvy (lack of vitamin C) and rickets (lack of

    vitamin D).

    4 marks

    10.(b)(i)

    (b) (ii)

    (b) (ii)

    (b) (iii)

    (b) (iv)

    Aim of choice

    To choose the most suitable menu for me as advised by doctor

    To choose a balanced diet menu to avoid obesity.

    Explanation on the advantages of each menu based on the food class and itsfunction

    Menu A Contains carbohydrates /fats for energy / protein for growth

    /vitamin C for health

    Menu B - Contains fats / carbohydrates for energy/ protein for growth /

    vitamin C for health.

    Menu C - Contains carbohydrates for energy/protein for growth /

    vitamin C for health.

    OR

    Explanation on the advantages of each menu based on the total energycalculated for the menu.

    Menu A Has the highest calorie among the menus.

    Menu B - Is the second higest/ lowest calorie

    Menu C - Has the lowest calorie.

    List of types of menu according to its priority

    1. Menu C

    2. Menu B

    3. Menu A

    The reason for your choice.

    Menu C is chosen because it is not too rich in calorie and can avoid getting more

    obese

    1 mark

    1 mark

    1 mark

    1 mark

    1 mark

    1 mark

    1 mark

    1 mark

    Total 10 marks

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    Question Marking Criteria Mark

    12.(a) Two differences between atomic elements and ionic compounds are:

    Atomic elements Ionic compounds

    Particles are atoms Particles are ions

    Form stable structure with

    strong metallic bonds

    Form crystals with strong

    electrostatic forces between

    ions

    Some are soluble in water

    but mostly not soluble

    Soluble in water

    Conduct electricity in solid

    and liquid state

    Conduct electricity in

    molten or in aqueous of

    solution

    Have free electrons Have exchange of electrons

    Example

    accept suitable examples

    Example

    (Any 2 differences )

    4 marks

    12.(b) *Two common characteristics of molecular substances are:

    - Particles are small molecules

    - Form simple molecules with weak intermolecular forces

    - Mostly in gases physical state

    - High melting point

    - High boiling point

    - Soluble in water

    - Do not conduct electricity

    (Any two)

    *One other example of molecular substances

    ( Any suitable example of molecular substances)

    *One example of non molecular substances and give reason for your choice

    ( Any suitable example of non molecular substances and state

    specifically characteristics.)

    [E.g Iron, because it has high melting point]

    - must relate specificly to the the characteristics of molecular substances

    *Relate the common characteristics to construct the concept of molecular

    substances

    - Molecular substances is a substance that have low melting point and

    soluble in water.

    2 marks

    1 mark

    1 mark

    1 mark

    1 mark

    Total 10 marks

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