Praktis Bestari Paper 2 MARKING SCHEME

8/14/2019 Praktis Bestari Paper 2 MARKING SCHEME

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Physics Paper 2 Projek Jawab Untuk Jaya ( JUJ ) Pahang 2008

PROGRAM JAWAB UNTUK JAYA 2008

PRAKTIS BESTARI

PHYSICS

Paper 2

Section A /Bahagian A

NO. MARKING CRITERIA / KRITERIA PEMARKAHANMARK

SUB TOTAL

1a. (i)

(ii)

b.

External jaw / outside jawRahang luar

0.01 cm

3.04 (-0.03)

= 3.07 cm

1

1

11 4

2a.

b.

c.

Constant accelerationPecutan malar

8 second / 8 s8saat/ 8 s

S1 = 252

816

+S2 = - ( )2512

2

1

S = ( )25122

1252

816

+

= 150 m

1

1

3

5

3a.

b.

c.

d. (i)

(ii)

RefractionPembiasan

Because the change of speed of waveKerana perubahan kelajuan gelombang

v = 5 3= 15 cm s-1 / 0.15 m s-1

DecreaseBerkurang

Speed of wave is directly proportional to its wavelengthKelajuan gelombang adalah berkadar langsung kepada panjang

gelombangnya

1

1

2

1

1

6

Marking scheme Soalan Praktis Bestari 1

1

2

3

1

2


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SUB TOTAL

4a.

b.

c. (i)

(ii)

(iii)

Manometer

d = 8 cm

Pressure, P = 76 + 8= 84 cm Hg / 114 240 Pa / 114 kPa

Y

d

ddecrease / shorterd berkurang / lebih pendek

Gas pressure in the cylinder decreaseTekanan gas dalam silinder berkurang

1

3

1

1

17

5a.

b.

c.

d.

e.

f.

Electric current is the rate of charge flow in a circuitArus elektrik ialah kadar pengaliran cas dalam litar

Q - R+

Dislike charged will attract each otherCas berlainan akan menarik satu sama lain

shape

arrow

P R

More electric field lines will be observedLebih garis medan elektrik akan diperhatikan

t =1

3

105.1

100.6

= 4.0 104 s

1

1

1

2

1

1

1

8


1

2

3

1

1

2


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SUB TOTAL

6a.

b.

c.

d.

e.

An instrument for measuring gas pressureAlat yang digunakan untuk mengukur tekanan gas

Pa

C

0

Pa

K

0

27 C = 300 K ; 57 C = 330 K

P =300

330120

= 132 Pa

Pressure LawHukum Tekanan

The mass of gas in the flask is less / not constantJisim gas dalam flask berkurang / tidak malar

1

1

1

3

1

18


1

2

3


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SUB TOTAL

7a.

b.

c. (i)

(ii)

(iii)

(iv)

d.

Direct current / arus terus

So that the pointer will only moves to one direction onlySupaya jarum hanya bergerak ke satu arah sahaja

F

F

Magnetic field lines 1

Arrow 2

A pair of opposite direction forces 3

Catapult forceDaya kilas / Daya medan lastik

Flemings left hand rulePeraturan tangan kiri Fleming

Inverse both the direction of current 1

Songsangkan arah kedua-dua arus

Exchange the position of permanent magnets 2

Saling tukar tempat magnet kekal

Increase the current / use stronger magnetMenambah arus / guna magnet yang lebih kuat

1

1

3

1

1

2

110


N S


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SUB TOTAL

8a.

b.

c.(i)

(ii)

d.(i)

(ii)

e.

Logic gate is the decision maker in electronic system; 1

with many inputs but only one output. 2

Get logik ialah penentu dalam sistem elektronik 1

dengan beberapa input tetapi hanya satu output 2

Four rows all correct 123

Three or two rows correct 12

One row only correct1

C 1

D 2

E 1

Relay switchSuis geganti

A small current from logic gate circuit can control a large

current in the air conditioner circuit

Satu arus yang kecil daripada litar get logik boleh mengawal satu arusyang besar dalam litar alat hawa dingin

I =240

1500 1

= 6.25 A 2

2

3

2

1

1

1

2

12


Input A Input B Output X

0 0 0

0 1

1 0

1 1 1


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SECTION B Answer Mark

9 (a ) Rate of change of momentumKadar perubahan momentum.

1

9 ( b ) A student bends his knees to increase the landing time

Seorang pelajar membengkokkan lututnya untuk memanjangkan masapendaratan.

A softball pull his hand backward to increase the stopping timeSeorang pemain sofbol menarik tangannya ke belakang untuk

menambahkan masa berhenti bola

Time taken is increased to stop the motionsMasa yang diambil dipanjangkan untuk menghentikan pergerakan.

From formula F ( Daripada formula F ) = mv-mu

t

When time taken (t) is increase, impulsive force (F) is reduceApabila masa yang diambil bertambah, daya impuls berkurang

1

2

3

4

5

9 ( c )

1,2

3,4

5,6

7,8



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9 ( d )(i)

9 ( d )(ii)

CharacteristicsCiri-ciri

ExplanationPenerangan

Safety belt When the car decelerates suddenly, thepassenger will be thrown forward due

to his inertia.

Apabila kereta diberhentikan secara mengejut,penumpang akan terhumban ke hadapan

disebabkan oleh inersianya.

Safety belt will hold the passenger back

to his seat.Tali pinggang keledar mengekalkan penumpang

pada kedudukannya.

Air bags Provide a cushion absorbing impact.Sebagai kusyen penyerap hentakan.

Prevent the passenger from hitting the

steering wheel or windscreen.Mengelakkan penumpang daripada terhentakpada stereng atau cermin hadapan.

Shatter-proofwindscreen

Will not break into small pieces uponimpact.Cermin hadapan tidak akan pecah berselerak

ketika hentakan berlaku.

Reducing the risk of passengers being

cut by the glass.Mengurangkan risiko penumpang terkena kaca.

The front and

back of the carare made from

soft metal

Easily collapse upon impact

Senang remuk apabila berlaku hentakan.

Lengthen the stopping time and reduce

the impulsive force during collisionMemanjangkan masa perlanggaran dan

mengurangkan daya impuls semasa

perlanggaran berlaku.

The centralportion consists

of strong

reinforced steel

Prevents the passenger chambers fromcollapsing easilyMengelakkan ruang penumpang daripada remuk

Prevent the passenger from direct

impact of the external forceMelindungi penumpang daripada terkena kesanhentakan

Ft = mv- mu

= 1 500 (0) 1 500(10)= - 15 000 Ns

F = (mv mu)t

= 1 500 (0) 1500 (10)

2

9,10

1

2

1

2



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= 7 500 N

TOTAL MARK 20

10. (a ) Radioactive decay is the process in which an unstable nucleusto become stable nucleus by emitting the radioactive radiation

and release the energy.Proses pereputan nukleus yang tidak stabil untuk menjadi nukleus yang

lebih stabil dengan memancarkan sinaran radioaktif dan membebaskan

tenaga.

1

10. ( b) The shape of the graph is exponential / curvelyGraf berbentuk eksponen/melengkung

Activity decreases with timeKeaktifan berkurang dengan masa

Activity become to be half in constant time interval

Keaktifan menjadi separuh dalam sela masa yang samaPhysics concept: Half life

Konsep fizik yang berkaitan: Separuh hayat

Time taken of activity become half from the initial activity.Masa yang diambil untuk keaktifan menjadi separuh daripada keaktifan

asal.

1

2

3

4

5

10. ( c ) (i)

10. ( c ) (ii)

= (236.05 235.85)u.j.a

= 0.2 u.j.a

= 0.2 u.j.a X (1.66 X 10-27)= 3.32 X 10-28 kg

E= mc2

= 3.32 X 10-28 (3X108)2

= 2.988X10-11 J

12

1

2

10. (d )



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TOTAL MARK 20

SECTION C Answer Mark

11.(a)( i) Distance between the optical centre and focal point.Jarak di antara pusat optik dengan titik fokus

1




The thicker concrete

wall

Dinding perisai plumbumyang tebal

To avoid radioactive radiation

released out

Sinar radioaktif tidak terbebas keluar

Using remote control /robot to handle the

radioactive substanceMenggunakan alat kawalan

jauh / robot untuk

menguruskan bahan

radioaktif

To prevent radioactive radiationexpose continuouslyMengelakkan sinaran radioaktif terdedah

secara berterusan

Wear a film badgeMemakai lencana filem

To detect the rate of exposure of

radioactive radiationMengesan tahap dedahan sinaran

radioaktifUse a special tank to

store the radioactive

wasteMenyediakan tempat

menyimpan sisa radioaktif.

Cannot pollute the environmentalTidak mencemar alam sekitar

Use an alarm / sirenAlat amaran kebocoran /

siren

As a reminder when the

radioactive radiation leakageMemberi amaran bila berlaku kebocoran

sinaran radioaktif

Wear a special safetyclothes

Memakai pakaianpelindung khas

To prevent the body exposedirectly to radioactive radiation

Mengelak badan daripada pendedahansinaran radioaktif secara terus.

Place a radioactivesymbol at the

radioactive roomMemasang pelekat simbol

bahan radioaktif di luar

bilik simpanan bahanradioaktif

As a sign radioactive materialstored inside that room.Memberitahu / amaran kepada orangramai bahawa terdapat bahan radioaktif

tersimpan di dalam bilik tersebut.


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11.(a)(ii) Arrange the lens and screen in parallel / diagramSusun kanta dan skrin secara selari / rajah

Face the lens toward a distant object.Halakan kanta kepada objek jauh

Adjust the screen until a sharp image is formed on the screen.

Laraskan skrin sehingga imej tajam terbentuk di atas skrinMeasure the distance between screen and optical centre.Ukur jarak antara skrin dengan pusat kanta

1

2

3

4

11. ( b )

Choose : QPilih : Q

Reason : Focal length of object lens greater than focal lengthof eye lens, bigger diameter of the object lens, smaller

diameter of eye lens and distance between two lens = f0 + fm

Sebab : Panjang fokus kanta objek lebih besar lebih besar daripada

panjang fokus kanta mata, diameter kanta objek yang besar, diameter

kanta mata kecil dan jarak antara dua kanta = f0 + fm

1,2

3,4

5,6

7,8

9

10

11. (c) ( i) f = 20 cm

v = 60 cm

f

1=

u

1+

v

1 1




Focal length of object

lens greater than focallength of eye lens.

Panjang fokus kanta objek

lebih besar lebih besardaripada panjang fokus kanta

mata.

Magnification power become

higherSupaya kuasa pembesaran tinggi

Object lens with bigdiameter

Diameter kanta objek yang

besar

Can receive more lightUntuk menerima lebih banyak cahaya

Eye lens with smalldiameter

Diameter kanta mata kecil

Suitable for size of the eye tolook the objectSesuai dengan saiz mata untuk

melihat objekDistance between the

two lenses = f0 + fmJarak antara dua kanta

= f0 + fm

Final image formed at infinitySupaya imej akhir terbentuk di infiniti


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11. (c) ( ii)

20

1=

u

1+

60

1

u = 30 cm

m = u

v

=30

60

= 2

2

3

1

2

TOTAL MARK 20

12. ( a ) (i) If the voltage supplied is 12V, the power generated is 24WJika voltan yang dibekalkan 12 V kuasa yang dijana 24W

1

12. (a )( ii) To give out more heat energyUntuk memberikan lebih banyak tenaga haba

1

12. (a ) (iii) 1. Length of conductor Panjang konduktor2. Cross sectional area Luas keratan rentas3. R is directly proportional to length, l

R berkadar terus dengan panjang,l

4. R is inversely proportional to cross sectional area, A R berkadar songsang dengan luas keratin rentas,A

1

2

3

4

12. ( b ) (i) R E = 4 + (4x4)

4+ 4= 4 + 2

= 6 1

12. ( b ) (ii) V = IR = 2 x 4= 8 V

12

12. ( b ) (iii) I = 12 = 2A6

1



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Connection to earthDisambungkan ke bumi

To flows the excess / overloadcurrent to earth if the is short

circuit

Untuk mengalirkan lebihan arus ke bumiuntuk mengelakkan berlakunya litar

pintas

Material of heating

coil is nichromeBahan gegelung pemanasialah nikrom

To produces high heat energyUntuk menghasilkan tenaga haba yang

tinggi

High number of loopBilangan lilitan gegelung

banyak

To increase surface area so that

more heat is releasedUntuk menambahkan luas permukaan,

maka lebih banyak haba dibebaskan

High powerKuasa tinggi

To produce more heat energy in

the coilUntuk menghasilkan lebih banyak

tenaga haba dalam gegelung

Choose : RPilih: R

Reason : because if is connected to earth, material isnichrome, high number of loop, and has high power.Sebab: .kerana disambungkan ke bumi, bahan gegelung pemanas ialah

nikrom, bilangan lilitan gegelung banyak dan kuasa tinggi.

1,2

3,4

5,6

7,8

9

10

TOTAL MARK 20

END OF MARKING SCHEME


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