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SULIT 1 1511/1&2(PP)

1511/1&2(PP) © 2011 Hak Cipta Jabatan Pelajaran Perak [Lihat halaman sebelah] SULIT

JABATAN PELAJARAN NEGERI PERAK

PEPERIKSAAN PERCUBAAN

SIJIL PELAJARAN MALAYSIA 2011

SCIENCE 1511/1&2

MARKING SHCEME

PAPER 1

Question Answer Question Answer 1 B 26 A 2 B 27 B 3 A 28 D 4 D 29 A 5 A 30 D 6 D 31 D 7 A 32 B 8 C 33 A 9 A 34 A 10 B 35 B 11 C 36 C 12 B 37 D 13 D 38 C 14 C 39 C 15 D 40 B 16 D 41 C 17 B 42 A 18 C 43 A 19 B 44 C 20 C 45 D 21 C 46 A 22 B 47 B 23 A 48 C 24 D 49 D 25 C 50 C


SULIT 2 1511/1&2(PP)


PAPER 2

Construct Marking Criteria Marks 1 (a) Volume of gas (collected) 1 (b)

1+1

(c) (i) Volume of gas collected is directly proportional to the reaction time

1

(ii) 48 cm3 1 TOTAL 5 2 (a) 1.5 ± 0.1 cm 1 (b) Near object from the pin-hole camera produce large image

Further object from the pin-hole camera produce small image The size of image in Diagram 2.1 is larger than the size of image in Diagram 2.2

1

(c) The nearer the distance of the object, the larger the size of the image The further the distance of the object, the smaller the size of the image

1

(d) The size of the object // The height of the object The size of the hole. // Number of pin hole

1

(e) The image is sharper // A sharper image is produced // Sharp image on the screen

1

3 (a) Bacteria cannot grow under white light / light / sunlight / bright light // Bacteria grows well in the dark place

1

(b) (i) Manipulated variable: Light intensity// presence of light 1 (ii) Responding variable: Growth of bacteria // Bacterial growth //

Cloudiness of nutrient broth 1

(c) In the dark 1 (d) Bacterial growth is a process that causes the nutrient broth

becomes cloudy 1

TOTAL 5

0 1 2 3 4 5 6 7

10

20

30

40

Volume of gas (cm3) Isipadu gas (cm3)

Time (minute) Masa (minit)

X

X

X

X X X


SULIT 3 1511/1&2(PP)


4 (a) Green pea seedling with complete culture solution have more roots than that of culture solution without phosphorous. Green pea seedling with complete culture solution produce more roots than culture solution without phosphorous.

1

(b) Complete culture solution contains phosphorous for the growth of roots

1

(c) (i) Type of seedling // Volume of culture solution // Size of seedling 1 (ii) The number of roots // Growth rate 1 (d) Algae will growth in the solution 1 TOTAL 5 5 (a) Radioactive decay 1 (b) Ray M : Beta rays

Ray N : Gamma rays 1 1

(c) Lead Concrete

1 1

[max 1] (d) - Cause cancer

- Kills / damage body cells / tissues - Causes infertility / sterility - Causes death - Causes mutation - Causes deformity of newborn babies

*Choose any two

1 1 1 1 1 1

[max 2] TOTAL 6 6 (a) (i) Mitosis 1 (ii) - To increase the number of body / somatic cells.

- Replace worn out / dead cells. - Reproduce asexually in unicellular organisms/ fungi/ ferns /

mosses

1 1 1

[max 1] (b) Each chromosomes doubles (to become a pair of chromatides)

Chromosomes replicate (to form two chromatides) 1

(c)

1

(d) Tips of shoot / roots 1 (e) 2 1 TOTAL 6 7 (a) X: Kernel

Y: Mesocarp 1 1

(b) Mesocarp // Y 1 (c) Vitamin A / E 1 (d) It is resistant to high temperature // Does not produce unpleasant

odours 1


SULIT 4 1511/1&2(PP)


(e) Sterilisation, Separation, Extraction, Filtration, Purification 1 TOTAL 6 8 (a) (i) Chilli sauce Y 1 (ii) Has expiry date 1 (b) (i) Monosodium glutamate 1 (ii) Cancer // Mental retardation in chlidren 1 (c) To slows down the action of bacteria // To avoid the bacterial

growth in food. 1

(d) Net weight // Quantity of food 1 TOTAL 6 9 (a) 3 1 (b) - Information is not affected by the change of wheather /

condition in the atmosphere - More information can be transmitted

1

1 (c) (i) P: Gamma ray 1 (ii) Radio waves 1 (iii) Microwaves 1 TOTAL 6

10 (a) Hypothesis - The presence of salt increases the boiling point of distilled

water. - Presence of impurities will increase the boiling point of distilled

water

1

(b) (i) Aim To study the effect of impurities on the boiling point of distilled water

1

(ii) Variables Manipulated: The presence of impurities / table salt Responding: Boiling point (of distilled water / mixture) Fixed: Volume of distilled water // Quantity of salt // Type of salt

1 1 1

[max 2] (iii) Apparatus

- Distilled water - Table salt - Beaker - Wire gauze - Tripod stand, - Bunsen burner - Thermometer

1

(iv) Procedure - Pour 100 cm3 of distilled water into a beaker.

1


SULIT 5 1511/1&2(PP)


- Heat up distilled water until it boils. - Observe and record the boiling point by using thermometer. - Repeat the experiment with mixture of distilled water and salt. *OR functional labeled diagram

1 1 1

(v) Result :

The presence of impurities Boiling point / oC Without salt

With salt

1

TOTAL 10 11 (a) Two differences between chemical and physical changes:

Chemical changes Physical changes

1. New substance is formed. 1. No new substance is formed.

2. Not reversible // Difficult to reverse

2. Reversible // Easy to reverse.

Example of physical changes: - Melting ice - Evaporation of water. - Dissolving sugar in water

1

1

1 1 1

[max 4] (b) (i) Common characteristics:

- New substance is formed. - Not reversible // Difficult to reverse

1 1

(ii) Other example of chemical changes: - Heating iron with sulphur - Burning magnesium in presence of air. - Heating copper (II) carbonate

1 1 1

[max 1] (iii) Two example of physical changes:

- Melting ice - Evaporation of water. - Dissolving sugar in water

1 1 1

[max 2] (iv) Chemical changes is a process which is new substance is formed

and not reversible

1

TOTAL 10


SULIT 6 1511/1&2(PP)


12 (a) Type of plastic Example

Thermoplastics Polyvinyl chloride (PVC) / nylon / polythene / perspex / polystyrene / polypropene

Thermosets Bakelite / melamine / epoxy glue /

1+1

1+1

(b) Identify the problem Environmental pollution

1

Clarification of the problem Improper disposal of plastics wastes.

1

Methods to overcome the problem Recycling the plastics Reuse the plastics Burning the plastics in incinerators. Bury the plastics in the ground. Use biodegradable plastics.

1 1 1 1 1

[max 3] Best method and reason Method: Burning the plastics in incinerators. Reason: Prevent the release of carbon dioxide or poisonous gases. [Any one method with correct reason]

1

TOTAL 10

END OF MARKING SCHEME


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