Pmr 2007 Science K1

SciencQ,PtnC zool -- It _

T;i:iv-:r.;t

Time: One hour

PAPER1[40 marks]

thebest answer of answers.Choose Eachquestionisfollowedbyfour choices Instruction: Answer all questions. for eaeryquestion. 1

Which of the following is a natural phenomenon? Antara yang berikut,yang manakah fenomena . semulaiadi? A Dam construction Pembinaanempqngan B Growth of a baby Pertumbuhanbayi C Uses of mobile phone Penggunaantelefonbimbit D Discovery of new medicines an baru Penemuanubat-ubat

The smallest cell in the human body SeIterkecildalambadanmanusia Can move by itself Bolehbergeraksendiri

Table 1 shows the volumes of different quantities of metal bobs, found using the water displacementmethod. Jaduall menunjukkanisipadubagiladunglogam kaedah yang bilangannyaberbezamenggunakan sesaranair. Quantity of metal bobs Bilangan ladung logam

Volume/cm3 Isipadulcm3

2

6

4

72

Which of the following ceils is described by the statements? Antara sel berikut,yang manakahdiperihalkan olehpernyataanitu? A Ovum cell Seloaum B Sperm cell Selsperma C Red blood cell Seldarahmerah D White blood cell Seldarahputih Diagram 1 shows four types of microorganisms. R a j a h 7 m e n u n j u k k a ne m p a t j e n i s m i k r o organisma.

Table 1 ladual 1. Predict the volume of 5 metal bobs. Ramalknnisipadubagi5 ladunglogam. A 3cm3 B 9cm3 C 15 cm3 D 18 cm3

Chlamydomonas Klamidomonas

The following are statementsabout an animal cell. Berikutadalahpernyataanberkaitsndengansatu sel haiwan.

Paramecium Paramesium

Amoeba Ameba

%-lat %w Spirogyra Spirogira

Diagram 1 Raiah 1

126 )

lJ*

"'n.,t

Which of the following are unicdllular mictrorganisms? A n t q r n y a n g b e r i k u t ,y a n g m a n a k n h mikroorgrnEmflunisel? A Amoeba, paramecium and Spirogyra Amebs,paramesiumdan Spirogira B Spirogyra, Amoeba and ChlJmydomonas Spirogira,Amebadan Ktamido*o,ro, C Chlamydomonas, Amoeba anrl Paramecium Klnmidomonas, Amebadan paramesium D Paramecium, Spirogyra and Chlamaydclmonas Paramesium,Spirogiradan Klamidnmonas

Cnt

e)

Y Diagram 2 Raiah2

Table 2 shows four subtanceswith different densities. I adual2 menunj ukkanempat bahanyang berlainan ketumpatan. Substances Bahan

Which of the following statements is true about the particles as the matte. .hu.,g", from state X to state y? A n t a r a p e r n y a t a a nb e r i k u t , y a n g manakah b.enartailang zarah-zarahapabiajiim berubnt daripadakeqdqanX kepadakeadaany? \A The kinetic energy of the particles decreases Te-naga kinetikzarqh_zarah berkurangan . B The distance between the pu?ti.l", becomefar apart

Density/g cm-s

larak di antara zarah-zarah menjadi lebilt

jauh C The particles take the shape of the container Zarah-zarahmengikutbentukbekas D The size of the particles increases Saiz zarah-zarah bertambalt

Iable 2 ladual 2 Given that the density of water is 1.0 g crnr, which substancescan float on water? Diberi bahazua ketumpatanair ialah 1.0 g cm-3, bahayyang manakahbolehterapungdi atqs air? A Ice and oil Ais dan minaak B Ice and iron Ais dan besi C Oil and mercury Minyak dan merkuri D Iron and mercury Besidan merkuri Diagram 2 shows matter in state X changing to state Y when heat is released. Rajah 2 menunjukkanjirim dalam kearlasn X..berubahkepadakeaclaany apabila haba dibebaskan.

127

P, Q and R are steps to separatea mixture of sand and salt. P , Q d a n R a d a l a hl a n g k a h _ l a n g k a h untuk v mengasingkan campuranpasir dan gorom.

I P l* I

I

Salt is left in the

|la |l-i

I

n l---- evaporating dish I

Goianiitin'ggotkon di dalammangkuk seiat

Which of the following correctly represent p, Q and R? Antara yang berikut,yang manakahmewakilip, Q dan R denganbetul?

a

P A

Filter the solution Turaskan larutan

Filter the solution Turaskan larutan

C

D

Stir and dissolve the mixfure Kacaudan larutknn campuran

R

Stir and dissolve the mixture Kacaudan Iarutkan campuran Evaporate the salt solution Sejatkan larutan garam Filter the solution Turaskan Iarutan

Stir and Evaporate dissolve the salt the mixture solution Kacaudan Sejatkan larutksn larutan campuran Saram

Evaporate the salt solution Sejatkan larutan Saram Stir and dissolve the mixture Kacaudan larutkan

Which energy change takes place when the wound-up spring is released? Apakahperubahantenagayang berlakuapabila springyang diputar itu dilepaskan? A Kinetic energy Sound energy --=' Tenagakinetik TenngaUunyi" B Potential energy Sound ----> "r.,"igy Tenagakeupnyaan Tenagabtmy"i' _ C Kinetic energy potential ----------> "ru.gy Tenagakinetik Tenagakeupayiln D Potential energy Kineiic ".,"rgy Tenagakeupayaan€ Tenagakinefitr 10 Houses in tropical countries are usuallv painted white to Rumah-rumahdi negaratropika biasanyadicat putih untuk A absorbheat menyeraphaba B radiate heat menyinarluba C detect heat mengesan haba D reflect heat memantulhaba

SAram Evaporate the salt solution Sejatkan larutan Saram Filter the solution Turaskan larutan

What are the products of combustion of a candle? Apakahhasilpembakaran lilin? A Nitrogen and oxygen Nitrogendan oksigen B Water vapour and oxygen Wapair dan oksigen C Nitrogen and carbon dioxide Nitrogendan karbondioksida D Water vapour and carbon dioxide Wapair dan karbondioksida

11. Diagram 4 shows a fire alarm s,gstem. Rajah 4 menunjukkansistem penggera kebakaran.

Bell Loceng

Diagram 3 shows a wound-up spring toy car. Rajah menunjukkankeretamainan berspring .3 yang diputar. Spring winder Pemutarspring

Diagram 4 Rajah4

Diagram 3 Rajah 3 728

P, Q, I{ and S are steps by which of the alarm works. P, Q, R dsn S adalahlangkah-langkah bagaimana peftggerqtersebutherfungsi. P - Bimetaliic strip expands and bends lalur dzoilogam mengembang dan rnembengkok Bimetallic strip touches the contact screw Q and the circuit is complete lalur dwilogammenyentuhskru sentuhdan melengkapkan litar R The fire increasesthe room temperature Api meningkatkan suhu bilik S The fire alarm bell rings Locengpenggera kebakaran berbunvi Choose the correct sequenceof steps to make the alarm works. Pilih urutan langkah4angkah yang betul untuk membuatpenggeraitu berfungsi. A R ---> P ---> Q ---+ S B P ----> Q ----.. R ---+ S C R,--->Q---+P---+S D P ----->R ---> Q ----+ S 12 Diagram 5 shows the heating of three metal rods, P, Q and R. A thumb-tack is attached at the end of each rod by a layer of plasticine. 5 menunjukkanpemanasantiga rod logam, \ojln P, Q dan R. Satu paku tekandilekatknnpadahujung setiaprod menggunakanpIast isin.

Masa yang diambil untuk paku tekan dicstatkandalam[adual3. Thumbtack at P Paku teknn diP Time/s Masals

150

Thumbtake at Q Pnku tekan di Q

Thumbtack at R Paku tekan di R

270

90

Table 3 ladual 3 Which of the following shows the metals in ascending order of their conductivity of heat? Antara yang berikut,y ang manakahmenunjukkan kedudukanlogam-logamitu dalamurutan menaik kekonduksian haba? A Q,&P C P,Q,R B &Q,p D Q,P,R 13 Which of the following sensory organs can detect touch, pain and p.ersorei Antara organderiaberikut,yang manakahboleh mengesan sentuhan,kesakitandan tekanan? A Eyes Mata B Nose Hidung C Ears Telinga D Skin Kulit 14 The calorific value of rice is 15 kJ/g. Calculate the calcirificvalue in 100 g of rice. Nilai kalori bagi nasi ialah lS kJlg. Hitung nilai kalori untuk 100g nasi. A lskj c 1s00ki B 30kj D 3000kj 15 Which of the following animals are coldblooded? Antara haiwan berikut, yang manakahberdarah sejuk? A Pigeon, Elephant, Frog Burung merpati,Gajah,Katak B Gold fish, Snake, Frog Ikan emas,lllar, Katak C Elephan! Pigeon, Frog Gajah,Burung merpati, Katak D Pigeory Gold fistr, Snake Burung merpati,lknn emas,lllar

Heat Panaskan Diagram 5 Rajah S The time taken for the thumb-tacks to drop is recorded in Table 3. 129

16 Table4 shows the massesof four students. The students climb up the stairs to different heights. ladual 4 menunjtrkkan lisim bagi empatoranR

Antara kesank habitat A

ttturitl.

Murid-murid fersebutmemanjattanggadengan ket inggianyang berbeza. Student Murid

Mass/kg Iisimlkg

Height of stairs/m Ketinggian tanggalm

P

42

a

a

50

6

R

80

4.5

S

54

2'5

Leaves Daun

B Caterpillar Beluncas Leaves Daun

Arrange the four students in ascenclingorder starting from the one with the leasl work done. Susunempatorangmurid itu mengikutsusunan menaikbermuladaripadayang melakukankeria paling kurang. A P,S,Q,R B R,Q,P,S D P,Q,S,R D S,P,R,Q

C

Frog Katak

17 Diagram 6 shows a pyramid number in a habitat. Rajah6 menunjukkan piramidnombordalamsuattt habitat. Snake Ular

100

Caterpillar Beluncas Leaves Daun 18 The following is a list of organisms.

Berikutadalahsenaraibeberapa organisma.

Frog Katak

500 5 000

Frog Katak Caterpillar Beluncas

Table 4 ladual4

5

t, yangmanakah menunfukkan at ittt jikn semuaular dalam unuh?

Rat I Tikus Paddy I Padi Caterpillar f Beluncas Cobra I Ular senduk Sparrow I Pipit Eagle I Helang

Caterpillar BelU N C A S Leaves Daun

Diagram 6 Rajah6

Choose a correct food web for these organisms. Pilih j aringan makanan yang betul bagi organisma tersebut.

Which of the following shows the effect on the habitat if all the snakesin the habitat are killed?

130

A Pa
--u--4 =-=-

Caterpillar Beluncas

-..---''->-.,'-

Pipit

_ Rat Tikus

Caterpillar Beluncas \==*Rat Tikus

Sparrow

_---->

-_-'-_..--_-->,'l

-=.---_*__Eagle ,--..-...'z Helang

---'' Cobra Ular senduk Cobra Ular senduk-\_

______>

_-==---l.Eagle Hrlong

-o'?

Sparroy__r' Pipit

Rat Tikus

Cobra Ular senduk _ =:----sEagte

Sparrow Pipit

-' Caterpillar I Beluncas

_-_=__>

Sparrow Pipit

--"?

Helang

Cobra Ular senduk --=;Eagle

Caterpillar Beluncas

Rat --------''-'--"'Helang Tikus

19 Diagram 7 shows processesp, e, R and S that occur in the carbon cycle. Rajah 7 menunjukkanprosesp, e, R dan S yang berlakudalamkitar karbon. Carbon dioxide in the atmosphere Knrbon dioksida di atmosfern

Death and decay Mati dan reput

DiagramT Rajah7 731

Which of the following are involved in the production and absorption of carbon dioxide? Antarayangberikut,yangmanakahterlibatdnlam penghasilan dan penyerapan karbondioksida? Produce rarbon dioxide Menghasilkan karbon dioksidn

Absorb carbon dioxide Menyerap karbon dioksida

A

P,Q

&S

B

&s

Q,P

C

P,Q,S

R

D

Q,&S

P

20 Diagram 8 shows two methods, p and e, of water purification. Rajah8 menunjukkandus kaerlah, p ande, unttrk pembersihan air. Muddy water Air lumpur First day Hari pertama

After three day Selepas tiga hari

Diagram 9 Rajah9

Pa Diagram 8 Rajah 8

a_

What is the reason for using methods p and Q? Apakahalassn menggunakankaedahp dan kaedahQ?

a

P A

To separate insoluble solids Mengasingkan pepejaltak larut

To kill microoganisms Membunuhmikroorganisma

B

To remove impurities Mengeluarknn bendasing

To remove colour Menghilangkan

To remove sediment Mengeluarkan keladak

To remove impurities Mengeluarkan bendasing

C

D To remove colour Menghilangkan warna

7.0arna

After three days, the water level in the beaker decreases. Why does this happen? S e l e p a st i g a h a r i , a r a s a i r d i d a t a m b i k s r berkurangan. Mengapaknhini bertaku? A Water molecules lose heat and turn into solid Molekul air kehilanganhabadan bertukar kepadapepejal B Water molecules absorb heat and turn into gas Molekul air menyeraphabadan bertukar kepadagas C Water molecules lose energy and turn into gas Molekul air kehilangantenagadqn bertukar kepadagas D Water molecules vibrate in a fixed position and turn into gas Molekulair bergetardi tempatyang tetapdan bertukarkepadagas 22 Diagram 10 shows a syringe used to transfer water. Rajah.l0 menunjukkanpicagariyang digunakan untuk memindahkan air.

To kill microorganisms Membunuhmikroorganisma

Syringe Picagari

Diagram 9 shows a beaker of water left on a table in the laboratory for three days. Rajah 9 menunjukkansebuahbikai berisi air ditinggalkandi atas mejadalammakmalselama tiga hari.

Water Air

Diagram 10 Rajah70

732

,"-.".F'fiffi.r
\ Why does the water enter the syringe when the piston is pulled up? Mengapakah air masukke dalampicagariapabila anfuohditarik ke atasT A The air pressure outside and inside the syringe is the same Tekananudaradi luar dan di dalampicagari adalahsama B The water pressure inside the beaker and inside the syringe is the same Tekananair di dalam bikar dan di dalam picagariadalahsama C The air pressureoutside the syringe is less than the air pressure inside the syringe Tekananudaia di luar picagari ada'lahlibih rendahdaripada tekananudara di dalam picagari D The air pressure outside the syringe is higher than the air pressure inside the syringe Tekananudara di luar picagariadatahlebih tinggi daripada tekanan udara di dalam picagari Diagram 11 shows a glass containing water placed upside down on a plastic cover. The water remains in the glass. From which direction A, B, C or D, does the air pressure acts so that the water does not spill? Rajah 71 menunjukkansebiji gelas berisi air ditelangkupkan di atassekepingpenutupplastik" Air kekaldi dalamgelasitu. Antara arah A, B, C dan D dari manakah t e k a n a n u d a r a b e r t i n d a k s u p a v aa i r t i d a k tumpah?

74 Diagram 12 shows a support system of\ insect. \ Rajah72menunjukkan sistemsokongan bagiseekor\ serangga.

Diagram 12 Rajah 72 What supports the insect's body? Apaknhyang menyokongbadanseranggaitu? A Exoskeleton Rangkaluar B Endoskeleton \ Rangkadalam C Segmentedabdomen Abdomenbersegmen D Hydrostatic skeleton Rangkahidrostatik Diagram 13 shows four models, W, X, y and

z.

Rajah13 menunjukkanempatbuahmodel,W, X, Y dan Z.

ffimff Diagram 13 Rajah 73

D--=>

Which of the following shows the correct arrangement of the models in ascending order of stability? Antarasusunanmodelberikut,yangmanaknhbetul mengikutkestabilansecaraurutan menaikT A Z,X,Y,W B Z,Y,X,W C Y,W, Z, X D X,Z,W,Y

3-B Plasticcover Penutupplastik C

Diagram 11 Rajah7I 1-a

IJJ

Which of the following statementsis correct about the effort that was used? betul AntaraTternyataan herikut,yang fiMl1akah mengtrnidatlayang digunakan? A P needs less effort than Q to pull out the nail P perludayatlangkurnngdaripadaQ untuk mencabut paku B Q needs less effort than P to pull out the nail Q perlu dnyatlangkurartgdaripadaP untuk mencabut paku C The distanceof the nail frorn the fulcrum does not influence the effort used Jarakpakttdarifulkrum tidakmempengaruhi dayayang digunakan D If the distance of effort is nearer to the fulcrum. the effort used will decreased lika jarak daya dekatdenganfulkrum, daya yang digunakanakanberkurang

26 Diagram 14 shows the position of a worket's hands lifting sand using a spade. kedudukrm tanganseorong RnjahT4menunjukkan ketiknmengangkatpasir menggunakan Ttekerja uenuodok. Right ha Tangank

t

Left hand Tattgankirr

Sand Pasir

Diagram 14 Rajah 74 What should the worker do in order to lift the sand using his minimum force? Apaknhyang perlu dilakukanoleh pekerjaitu pasir denganmenggunakan untuk mengangkat dayayang minimum? A Move both hands to P Gerakkankedua-duatanganke P B Move the right hand to Q and the left hand to S Gerakkantangan kanan ke Q dan tangan kiri ke S C Move the left hand to S without changing the position of the right hand Gerakkantangankiri ke S tanpa menguhah kedudukantangankanan D Move the left hand to R without changing the position of the right hand Gerakkantangankiri ke R tanpamengubah kedudukantangankanan -

27 Diagram 15 shows a nail being pulled out using tools, P and Q. Rajah L5 menunjukkansebatnngpaku dicabut alat P dan alat Q. denganmenggunakan

T h e f o l l o w i n g s t a t e m e n t sa r e a b o u t t h e transportation of oxygen in the human body. Pernyataanberikutadnlahberkaitanpengangkutan oksigendalambadanmanusia.

K _ Oxyhemoglobin breaks into oxygen and hemoglobin diuraikanmenjadioksigen Oksihemoglobin dan hemoglobin L

Oxygen diffuses through alveoli into the blood capillaries Oksigenmeresapmelaluialaeolike dalam kapilaridarah

M-

Oxygen combines with hemoglobin to form oxyhemoglobin Oksigenbergabungdenganhemoglobin membentuk oksihemo globin

N_

Oxyhemoglobin is transported to all parts of the body O k s i h e m o g l o b id ni a n g k u tk e s e l u r u l t bahagianbadan

Which of the following is the correct sequenceof the transportation? Antarayang berikut,yang manakahurutan yang itu? betulbagipengangkutan A M,K,L,N B K,L,M,N C N,KL,M D L,M,N,K

Diagram 15 Rajah 15 734

29 I ) i a g r a n i 1 6 s h o w s t h e b l o o d c i r c u l a t o r v r systern in the human bodv. tlnlah 76 menunjukkansisien daroh ltpt.cdaran dalambarlanmanusia. [,,ungs Pcparu

D

Deoxygenatedblooclflorvs from the turrg\ to the heart ancl to all parts of the bodri I)arah terdeoksigen mengalirdari pepani k,, dnn ke selun,th lnrttung bal.tagiart bad|an

30 D i a g r a m 1 Z s h o r a r st h e h u m a n urinarv system. Raiah77 menunjukkntsistemt.trinsrimantrsin.

Heart lantung

Body Badarr

Diagram 16 Rajah76

Diagram 77 Rajah17

Which of the following statements is true about oxygenated and deoxygenatedblood? Antqra pernyataanberikut,yorg *onokah benar tentangdarahberoksigen dan daiah terdeottsigen? A Deoxygenated blood flor,r,sfrom the heart to all parts of the body Darah terdeoksigen mengaliirlari lantung ke seluruhbahagianbadai B Oxygenated blood flows from the lungs to the heart and to all parts of the bodf Darah beroksigenmengalir dari peparu ke jantung dan ke seluruhbahagianbaian _ C Oxygenated blood flows irom the heart g th: l_ungsand to all parts of the body Darah beroksigenmengilir tlari jantung ke peparudan ke seluruhbahagianbadan

What is the function of X? \Apakahflmgsi X? A Carries urine to the urinary bladder Membazt'a air kencingke puiAi kencing B Filters the blood rt hich contains waste products Menapisdarah Vangmengandungibahart buangan C Removescarbon dioxide and water from the body Menyingkirkankarbondioksiriadan air clari hadan D Brings blood containing lvaste products to the kidney Membawadarahyang mengardungibahan buanganke ginjnt

31 Diagram 18 shows a machine used by a patient with malfunction of both kidneys. Raiah 78 menuniukkanmesinyang ,tigrtiakan oleh seor{tngpesakityang ke.dua-dua ginjatnya tidak berfungsi. Blood in Darah mqsuk

"<-- Dialysing fluid in Cecsirdialisis masuk Flow meter Meter ciliran

Blood clot and bubble trap _ Perongkapdarahbekttdan iuih

<_--

Blood out

Darahkeluar Diagram 18 Rajah78

I

I

I t-

i35

Partially permeablemembrane Membrunseparatelap ----r" Dialysing fluid out Cecairdialisiskeluqr

33 Diagram 19 shows a curve of human growth. R a i a h 7 9 m e n u n j u k k a ng r a f l e n g k u n g a n pertumbuhan manusia.

What is the function of this machine? Aitakahfungsimesinini? A To filter urea from the kidney Menapisureadari ginjal B To filter n'ater from the blood Ivlenapisair dari darah C To filter protein and glucose from the kidney Mcnapisproteindan glukosadari ginjal D To filter urea and mineral salts from the blood Menapisureadan garammineraldari darah

Height/cm Tirtggilcm

32 Which of the following pairs are correct methods of birth'control for a male and a female? Antara padananberikut, yang manakahbetul kehamilanbagiseoranglelakidan untuk mencegah seorangperempuan? 4872L620242832 Male LeIaki Cut and tie the sperm duct Potottgdan ikat duktussperma

Use spermicide cream Cuna krim spermisid

B

Take hormone pills Ambil pil hormon

Use IUCD CunaIUCD

C

Use diaphragm Guna diaf'agma

Cut and tie the fallopian tubes Potongdan ikat tiub

A

D

Use rhythm method Cuna kaedahritma

AgulYuu' Umurltahun

Female Perempuan

Diagram 19 Rajah19 Which parts show the most rapid growth? Di bahagianmanakahmenunjukkan pertumbuhan yang paling pesat? A QandR QdanR B QandS QdanS C PandS P danS D PandR P dsnR

falopio Take birth control pills Ambil pil pencegah kehamilan

34 Diagram 20 shows P, Q and R using the product of petroleum. hasilpetroleum. Rajah20 menunjukkanP, Q dan R yang menggunakrtn

P

a Diagram 20 Rajah20 136

R

Which of the following shows the colrect petroleum products used by p, e anct R? Antarsyangberikut,yangmanakahmenunjukkan p"enggunilan hasilpetroleumyang betulbagi p, e dan R7

a

P

P

Diesel Diesel

Kerosine Kerosin

Diesel Diesel

Kerosine Kerosin

Fuel oil Minyak bahanapi

C

Kerosine Kerosin

Fuel oil Minyak bahanapi

Diesel Diesel

D

Fuel oil Minyak bahanapi

Kerosine Kerosin

Diesel Diesel

R

_q _lu_ -lrlr--@- -o-€)-

R

Fuel oil Minyak bahanapi

--;\

r-)

--;-.---p

tl-

V

--@- -G- -lrlr

D

-o- -o- -€>_9 -lrlr

36 Diagram 23 shows a circuit where one of the bulbs has fused. This will prevent the other three bulbs from lighting up. Rajah23menunjukkan sebuah litar dengankeadaan satu daripadamentolitu telahterbakar. Ini akanmenghalang tigamentolyanglain dariparla menyala,

35 Diagram 21 shows four symbois for a circuit diagram. Rajah27 menunjukkanempatsimbol bagi suatu raiah litar.

Diagram 21 Raiah27 Diagram 22 shows a complete circuit. Rajah22 menunjukkansatu litar lengkap.

Diagram 23 Rajah23 Which bulb shown in the circuit is fused? Me-ntolyang manakohdalarnlitar itu yang tct ! terbakar? AK CM B L DN

Diagram 22 Rajah22 Which combination of the symbols would be the most suitable to measurethe resistanceof in the complete circuit inDiagram 22? ?-b"l! Kombinasisimbolyang ffianakahpaliig sesuai digunakanuntuk mengukurrintangai sebuah mentoldalamlitar lengkappadanaiitt ZZZ

137

37 Aballoon which has beenrubbed with a piece of cotton cloth is attracted to a positively charged ruler. Satubelonyang telahdigosokdengansehelaikain kapastertarik kepadapembarisying *r,npunyai caspositif. This situation occurs becausethe balloon Keadaanini berlakukeranabelonitu A releasesnegative charges membebaskan casnegatif B receivesnegative charges menerimacasnegatif

C D

has the same positive chargesas the ruler memptmyaicaspositifyang samadenganpembaris has more positive chargesthan the ruler mempunyailebihcaspositifdaripadapembaris

Diagram 24 shows an electricalenergy transmissionand distribution system from a power station to industrial, tolt'n and residential areas Rajah24 menunjttkksnstttusistempenghantaran dan pengagihan tenagaelektriktiart satu stesert kuasape kazuasan industri,bandsrdan peruftnhan. 275 kV or 500 kV 275kVatau500kY

Light industries Industri ringan Residential areas Kawasqnperumahan

475 415

240V 240V

National grid Grid nasional Heavy industries Industri berat

Substation Pencawang

Substation Pencawang

Main substation Pencawangutama

Diagram 24 Rajah 24 The decreases of voltage are done Penurunan aoltan dilakukan A because it depends on different values of current kerana ia bergantung kepadaperbezaannilai

39 Which of the following occur in the core of

arus becausethe main substationcan accept only 33 kV keranapencqwang utamamampumenampung aoltansebanyak 33 kV sahaja C due to the different requirementsof energy by the industries and the residential areas berdssarksnkEerluantenagayang berbeza bagi kazuasan industri dan kautasqn perumahan D to ensure the step-up stransformer and step-down transformer function very effectively untuk memastikan transformeriniak turun dan transformerinjak naik berfungsidengan berkesan B

the Sun? Antara yang berikut,yang manakahberlakudi terasMatahari? A Bright light is formed Cahayayang terangterbentuk B Projectionof gasesis formed Pancutangas terbentuk C Hydrogen atoms fuse to form a helium atom Atom hidrogenmelakurmembentukatom helium D Charged particles and electromagnetic waves are released Z a r a h - z a r a h b e r c a sd a n g e l o m b a n g elektromagnet terhqsil

138

-'4hnrdJ

FIow did Claudius Ptolemy contribute terthe study of astronomy? Bagaimanakah ClaudiusPtolemymenyumbang kepadapembelaj aran astrononti? A I'Ie suggested that the Moon producecl its own light D i a m e n c a d a n gB u l a n m e n g h a s i l k a n cahaqanya sendiri B He assumed the Sun was the centre of the solar system Dia mengnnggnp Matahari adalahpusat sistemsolar

r39

He assumedthe Earth was the centre of the universe Dia mengnnggnp Bwni sebagni pusatalatn semesta He classifiedstars into six grcrlipl; accordingto their colours Dia mengelaskan bintang-bintang kepndn ennnt kumpulan berdasarlcanLU an ulnVa