JABATAN PELAJARAN NEGERI PERAK

PEPERIKSAAN PERTENGAHAN TAHUN SAINS

PMR 2011

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MARKING SCHEME

Science – Paper 2

Q Answer Marks

1(a)

(b)(i)

(b)(ii)

SmokeAsap

SolidPepejal

Cooking OilMinyak masak

LiquidCecair

StoneBatu

GasGas

Total

(1 mark each)

3 marks

(1 mark each)

2 marks

1 mark

6 marks

2(a)(i)

(a)(ii)

(b)

Slow

Because it has less difference in pressure

Make another hole // open the lid

1 mark

1 mark

1 mark

1

Solid GasLiquid

Move freelyBergerak dengan bebas

√ Vibrate about a fixed positionBergetar pada tempatnya

(c)

(d) Volume // Altitude Total

2 marks

1 mark6 marks

3(a)

(b)(i)

(b)(ii)

(c)

(d)

Potential energy

S

S is the nearest to the centre of gravity // It is the lowest point

Kinetic energy

Total

1 mark

1 mark

1 mark

1 mark

2 marks

6 marks

4(a)(i)(ii)

(b)

(c)

R, S // left atrium, left ventricleLeft ventricleReason: need to pump blood to all parts of the body // Has to exert higher blood pressureOxygenated blood is bright red whereas deoxygenated blood is dark red in colour. //Oxygenated blood contains higher concentration of oxygen whereas deoxygenated blood contains higher concentration of oxygen. //Oxygenated blood contains lower concentration of carbon dioxide whereas deoxygenated blood contains lower concentration of carbon dioxide.

A

Total

2 mark1 mark1 mark

1 mark

1 mark

6 marks

2

Kinetic (energy)

Heat (energy)

√

√

Rice cooker

Rubber sucker

Syphon

Electric kettle

5(a)(i)(a)(ii)(a)(iii)(a)(iv)(b)(i)(b)(ii)(c)(i)

(c)(ii)

Break/ shed downTo prevent infection (of the reproductive organs)Fertilisation // pregnancyContinues to thicken7th June 201123th May 2011Zygote undergoes cell division //Embryo travels along the fallopian tube //Implantation of embryo in the uterusIUCD

Total

1 mark 1 mark1 mark1 mark1 mark1 mark1 mark

1 mark

6 marks

6(a)(i)(a)(ii)

(b)(c)(i)(c)(ii)

(c)(iii)(d)(e)

HydrogenBurning wooden splinter extinguished and a ‘pop’ sound is producedCombustion / respiration / burningCompoundIt contain two or more element which are chemically combined //can only be separated chemicallyCarbon dioxide (any relevant answer)To increase rate of conductivity of waterEvaporation

Total

1 mark1 mark1 mark1 mark1 mark

1 mark1 mark1 mark8 marks

7(a)(i)

(a)(ii)

(b)

(c)(d)

Brick red precipitate is formed in Diagram 7.1(a) when tested with Benedict solution //Blue colour remain the same in Diagram 7.1(a) when tested with Benedict solution Brick red precipitate is formed because glucose is present

Manipulated Variable Presence of glucose // absence of glucose

Responding Variable The change of colour in Benedict / Iodine

If glucose is present, brick red precipitate will be formedTurns to dark blue

Total

1 mark

1 mark

2 mark

1 mark1 marks

3 marks

9 marks

3

Supply energy Growth

Bread, mee Fish

8(a)(i)

(ii)(iii)

(b)

(c)

(d)(i)(ii)

(e)

(f)

Water in B is hotter than in A // Water in A is cooler than in BIf container A is used, water will become less hot // vice versaWater in B is hotter because B prevents more heat loss /B releases less heat15, 30, 45, 60

Note: 3 correct – 2 marks 2 correct – 1 mark

0-1 correct – 0 mark

Note: All points correct – 1 markWidth of the bar – 1 mark

Types of rodTime taken // conductivity of heat

Different types of rod has different time taken for thumbtacks to drop

A good heat conductor is reading of stopwatch

Total

1 mark

1 mark1 mark

2 mark

2 marks

1 mark1 mark

1 mark

1 mark

11 marks

4

Glass Iron Copper Aluminium