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PEPERIKSAANPERCUBAANPMR2012NEGERIPERAKSKEMASAINSKERTAS1

Nombor Jawapan1 B2 B3 D4 A5 A6 B7 C8 B9

B

10 B11 D12 C13 A14 A15 D16 C17 B18 D19 A20 C

Nombor Jawapan21 C22 B23 B24 C25 C26 D27 B28 C29

A

30 A31 A32 C33 D34 B35 A36 C37 B38 D39 C40 D

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SCHEME OF ANSWERS

PMR TRIAL EXAMINATION

SCIENCE PAPER 2

Question

No.

Answers Marks

1 a) X - lensY - Vitreous humour

Z - Optic nerve

b)3m

3mTotal6m

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3

W

2 a) iron block - sink

Wooden block -float

b)

4 correct 2m2 3 correct 1m

c)

2m

2m

2m

Total

6m

3 a) (I ) Producer - K

(ii) Secondary consumer - Mb) ( I )

4 correct-2 m

2-3 correct-1m

(c) Food chain

2m

2m

1m

d) (Population) L decreases / N increases / K decreases 1m

Total -6m

L

M

N

K

MK LN

YZAir

ZY

W

X

X

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4 (a) (i) lime water turns chalky / cloudy / milky

Temperature in the gas jar increases / rises

(ii) Carbon dioxide

(b) (i) water

(ii)

Anhydrous Cobalt chloridepaperBicarbonate indicator

(c) Fuel for aircraft

1m

1m

1m

1m

1m

1m

Total

6m

5 (a) ( i) To increase the voltage

( ii ) 240 V

(iii) X : Step up

Y : Step down

(b ) ( i) The number of turns of wire in secondary coil Q is higher ( than in primary

coil/P)/ vice versa

( ii ) The output (voltage) is higher / The voltmeter reading increases

(c) P1 - To reduce the voltage

P2 - To prevent the handphonefrom blows out/ damage / not function / burn/

explode

Reject: Handphone can last longer

1m

1m

2m

1m

1m

1m

1m

Total

8m

6 (a) (i) X - White blood cell

Y - red blood cell

(ii) X: To kill microorganisms./ body protection / fight against diseases / prevent

from infection

Y: Transport oxygen ( to the whole body)

(iii) X has no nucleus, Y has nucleus /X has no fixed shape , Y has biconcave shape.

(b) ( i) Blood group O

(ii ) Agglutination of blood will occur.

2m

2m

2m

1m

1m

Total

8m

7 (a) (i) Clothes in condition A dried faster because the weather is hotter/temperature is

Higher/ light intensity is higher

Clothes in condition B dried slower because the humidity is higher/ temperature

Is lower

(ii) The higher the temperature the faster the clothes dried // vice versa

1m

1m

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(b) (i)

Set

Time taken for cobalt chloride paper to change

colour(minute)

A 10

B 25

(ii) The time taken for cobalt chloride paper to change colour is shorter if the

temperature is higher/ vice versa

(iii) The higher the surrounding temperature the higher the rate of evaporation

(c) Volume of water

(d) Hanging clothes and drying hair using hair dryer

2m

1m

1m

1m

2mTotal-

9m

8 (a) (i) X is more stable than Y

(ii) The bigger / wider the base area, the higher the stability /

The lower the center of gravity, the higher the stability

(iii) X is more stable because X has bigger base area/

X is more stable because X has lower center of gravity/

Reject: height/taller/ shorter

(b) (i) 60

(ii) Graph

1mark for correct points plotted

1 mark for bar chart ( the same width and has space between graph)

Reject: histogram

K L M N

1m

1m

1m

1m

2m

1m

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( c) The longer the length of stick the less stable the object is.// vice versa

(d)

Controlled variable Base area

Manipulated variable Length of stick

Responding variable Mass of weight

(e) Stability of object is the mass of weight (to topple the object)Total-

11

1m

3m

1m

ENDOFMARKINGSCHEME