Science 2 Answer Scheme (Perak's PMR Trial 2012)

7/31/2019 Science 2 Answer Scheme (Perak's PMR Trial 2012)

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SCHEME OF ANSWERS

PMR TRIAL EXAMINATION

SCIENCE PAPER 2

Question

No.

Answers Marks

1 a) X - lens

Y - Vitreous humour

Z - Optic nerve

b)3m

3m

Total 6m


2/5

W

2 a) iron block - sink

Wooden block -float

b)

4 correct

2m23 correct1m

c)

2m

2m

2m

Total6m

3 a) (I ) Producer - K

(ii) Secondary consumer - M

b) ( I )

4 correct-2 m2-3 correct-1m

(c) Food chain

2m

2m

1m

L

M

N

K

MK LN

X

W

Y

Z

X Air


3/5

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

Total -6m

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

Total6m

5 (a) ( i) To increase the voltage

( ii ) 240 V

(iii) X : Stepup

Y : Stepdown

(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 handphone from blows out/ damage / not function / burn/

explode

Reject: Handphone can last longer

1m

1m

2m

1m

1m

1m

1m

Total8m

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

Y - red blood cell

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

Total8m


4/5

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

(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

1m

1m

2m

1m

1m

1m

2m

Total- 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) Graph1markfor correct points plotted

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

Reject: histogram

1m

1m

1m

1m


5/5

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Science 2 Answer Scheme (Perak's PMR Trial 2012)