gerak gempur sains 2010 - marking scheme ct seriperakpb

7/30/2019 Gerak Gempur Sains 2010 - Marking Scheme Ct Seriperakpb

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MARKING SCHEME GERAK GEMPUR SAINS 2010

SIJIL PELAJARAN MALAYSIA 2010

SCIENCE PAPER 2

GERAK GEMPUR

MARKING SCHEME

1511/2 SULIT1


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Section a

QuestionNo

1

Marking criteria

(a) (i) The thermometer reading decrease (in diagram 1.2)

1 m

Bacaan termometer menurun ( dalam rajah 1.2)

(ii) -2oC

(b) (i) Presence of impurities/common salt

1 m

Kehadiran bendasing / garam biasa

(ii) The thermometer reading / freezing point1 m

Bacaan termometer / takat beku

(c) Distilled water is a pure water/liquid with the freezing point of 0C

Air suling adalah air/cecair tulen yang mempunyai takat beku 0C

Total 5 m

Mark

1m

1m

1m

1m

1m

2 (a) Metal X is the most reactive // Metal Y is the least reactive1 m

Logam X paling reaktif // logam Y paling tidak reaktif

(b) (i) Type of metal

(ii) Amount/Quantity/Mass of metal

(c) X, Z, Y

1 m

(d) Magnesium1 m

Total 5m

1m

1m

1m

1m

1m

1511/2 SULIT2


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3

- All points are transferred correctly

(Semua titik betul dipindahkan)

- Smooth graph

(Graf licin)

(b) 5

(c) The higher/lower the temperature, the higher/lower the number of

bacterial colonies

Semakin tinggi/rendah suhu semakin tinggi/rendah bilangan

koloni bakteria

(d) The highest temperature kill/destroy the bacteria // Bacteria is notactive at the lower temperature.

Suhu yang paling tinggi membunuh/memusnahkan bakteria //

bakteria tidak aktif pada suhu yang paling rendah.

Total 5m

1m

1m

1m

1m

1m

1511/2 SULIT3

x

x

Number of bacterial colonies

(Bilangan koloni bakteria)

6

8

4

10

12

0

2

10 20 4030 50 60Temperature (oC)

(Suhu oC)


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4 (a) As the time increases, the length of the ticker tape sectionsdecreases//The longer the time, the shorter the length of the ticker tape

sections.

(b) (i) Time / masa

(ii) Length of ticker tape /panjang pita detik

(c ) 3.2 + 0.1 (cm)

(d) Any value less than 3.2 (cm) Total 5m

1m

1m

1m

1m

1m

Question

NoSECTION B

Marking criteria

Mark

5 (a) Discontinuous variation1 m

Variasi tak selanjar

(b) Type of earlobe// ability to roll tongue//blood group1 m

Jenis cuping telinga//kebolehan menggulung lidah//kumpulan

darah

Accept any suitable answer

(c) Genetic factor

Faktor genetik

1 m

(d) 2 m

(e) Curly hair

Rambut kerinting

Total 6m

1m

1m

1m

2m

1m

6 (a) T : Beta ray /sinar BetaV : Alpha ray /sinar Alfa

(b) (i) V ray / Alpha ray /sinar Alfa

1m

1m

1m

1511/2 SULIT4

Hh Hh Hh Hh


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(ii) because it deflect to negative plate

kerana ia terpesong ke plat negatif

(c) U ray/gama ray/Sinar U//Sinar gama

(d) Placed in lead block//concrete container

Letak dalam blok plumbum//bekas konkritTotal 6m

1m

1m

1m

7 (a) X - GreenY - Cyan

Z - Magenta

(b) Red // blue // green

(c) (i) Black

(ii) Green

Total 6m

1m

1m

1m

1m

1m

1m

8 (a) Thermoplastic : Bottle and Rain coatThermoset : Epoxy glue and Electric plug

(b)

Thermoplastics Thermosets

(c) Electrical insulator // Low melting point // Resistant to chemical

substance // Dissolve in organic solvent // Can be recycle(any one)

(d) PVC (Polyvinyl Chloride)

Total 6m

1m1m

2m

1m

1m

9 (a) Oscilator(Pengayun)

(b) Electrical energy Sound energy Tenaga elektrik Tenaga bunyi

1m

1m

1m

1511/2 SULIT5


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(d) (i) Transistor

(ii) To strengthen modulated audio signals

Untuk memperkuatkan isyarat audio yang termodulasi

1 m

(e) Reflective // can travel long distances // able to move through

vacuum // travel at the speed of light // not easily affected by

obstacles

dapat dipantulkan // boleh bergerak jauh // boleh bergerak

melalui vakum //bergerak dengan halaju cahaya // tidak

mudah dihalang oleh halangan1 m

Total 6 m

1m

1m

1m

QuestionNo

SECTION CMarking criteria

Mark

10 (a) Hypothesis :Acid can coagulate the latex/Alkali prevent the latex from

coagulating

(b)

(i) Aim of the experiment :

To study the effect of acid and alkali on latex.

(ii) Identification of variables

a. Constant variable :

The volume of latex/acid/alkali//The concentration of

acid/alkali

b. Manipulated variable :

Type of chemical added// Acid and alkali

c. Responding variable :

The condition of latex //The coagulation of latex

(any two)

(iii ) List of apparatus and materials :

Beaker / any suitable container , Glass rod , Measuring

1m

1m

2m

1511/2 SULIT6

(c)

Or


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cylinder,Latex, Ethanoic acid ,Ammonium solution

( iv) Procedure

i. Pour 20 cm3 latex into beakers labelled A and B. //Diagram

ii. Add a few drops of ethanoic acid into beaker A // Diagram

iii. Stir the solution for a few minutes.

iv Observe and record the condition of latexv. Repeat stage (ii) to (iv) using ammonium solution// Diagram

(Any four)

(v) Tabulation of data

Type of chemical added The condition of latex/The coagulation

of latex

Latex + Ethanoic acid

Latex + Ammonium

solution

Total 10m

1m

4m

1m

11 (a) 1. Dilation of pupils2. Increase in breathing rate

3. Increase in heartbeat

4. Increase in blood pressure5. Increase in blood glucose level

6. Increase in energy production

(any four)

(b)Able to list down two common characteristics

1. Controlled by the cerebrum according to our will

2. Involve skeletal muscles3. Can be quickened or slowed down

4. We are aware of the action being planned and taken

(any two)

Able to relate two common characteristics to the action in

order to construct the initial concept

Controlled by the cerebrum according to our will and we are awareof the action being planned and taken is called voluntary action.

Able to state one example of another voluntary action

Walking, dancing, running (all the voluntary action)

Able to state one example of involuntary action

Sweating, digestion of food, peristalsis, breathing

Able to construct the actual concept of voluntary action

4m

2m

1m

1m

1m

1511/2 SULIT7


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Voluntary action are controlled by the cerebrum accroding to our

will and we are aware of the action

Total 10m

1m

12 (a)

1. Artificial colouring

Effects- Causes cancer// food poisoning2. Bleach / peluntur

Effects- food poisoning // cancer

3. FlavouringEffects Mental retardation especially in children // cancer

4. Artificial sweetener / Pemanis tiruan

Effects Cancer

5. Antioxidant / pengantioksidaEffects Growth retardation // damage liver and kidneys

(any two chemicals and effect)(b)

Problem statement

How to store the catch for a longer period

Methods and explanation

1. DehydrationExplanation Most bacteria die or become completely inactive

in the absence of water

2. Freezing

Explanation At lowest temperature, less than -18C there is

absolutely no bacteria activity

3. Canning

Explanation Heating at 116C - 121C can kill off all the

bacteria including their spores and the can is sealed while still

hot.(any two methods and explanation)

Best method and explanation

Freezing

The food can be stored longer lasting because of microorganismscannot grow and reproductive at low temperature

Dehydration

4m

1m

4m

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The food can be stored longer lasting because of microorganisms

cannot grow and reproductive in the absence of waterCanning

The food can be stored longer lasting because of microorganisms

cannot grow and reproductive at high temperature

Total 10m

1m

END OF MARKING SCHEME

PERATURAN PEMARKAHAN TAMAT

1511/2 SULIT9

gerak gempur sains 2010 - marking scheme ct seriperakpb

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