SULIT

JABATAN PELAJARAN PERAK

PEPERIKSAAN PERTENGAHAN TAHUN 2010TINGKATAN 3 SCIENCE Mei / Jun2010

SCIENCEPAPER 1 & 2

PERATURAN PEMARKAHAN

1

Jabatan Pelajaran Negeri Perak

Peperiksaan Selaras Pertengahan Tahun 2010

Skema Sains Kertas 1

No soalan

Jawapan No soalan

Jawapan No soalan

Jawapan No soalan

Jawapan

1 B 11 B 21 B 31 A2 C 12 C 22 D 32 D3 B 13 A 23 A 33 D4 C 14 C 24 C 34 A5 D 15 C 25 B 35 D6 A 16 C 26 A 36 B7 B 17 A 27 D 37 C8 B 18 A 28 D 38 D9 C 19 B 29 B 39 B

10 A 20 D 30 C 40 C

Skema Sains Kertas 2

2

Questions Rubrics Marks 1 a (i) Q : compression

R: lever S : beamb. weight : compression balance/ spring balance mass : lever balance

3 correct - 2m2 correct, 1 wrong - 1m1 correct , 2 wrong - 0 m 1 correct without wrong – 1 m

c. kilogram/ kg

1 each

3m

2m

1mTotal : 6m

2 a (i) from the blood capillary to the body cells

Reject: line without arrow : sentence

(ii) diffusion b X : higher concentration / more (than Y) y: lower/ less concentration ( than X)

NOTE : The answer should show the comparison

c. oxyhaemoglobin

d. (i) reduce the transportation of Oxygen to the body cells.// body cells will lack of Oxygen

(ii)use lead – free fuel/ unleaded petrols// (catalytic) converter to the exhaust// Car pooling// use public transport// maintan vehicles under good condition

1m

1m

1m

Any 1 correct: 1m

Total : 6m

3

3

4

5

a) increase in size // increase in number of cells// increase in weightb) Infancy/ adolenscence // teenagersc) i. adolenscence

ii. female reach puberty faster earlier than male/male reach puberty late than female./ female reach puberty at the age of ( 11 to 14) but male reach puberty at the age of ( 14 to 16)

d. i) protein /calcium ii) protein: build new tissue/ /formation of cell calcium : formation of born / teeth

a. i) hydrogen ii) lighted wooden splinter will produce ‘pop’ sound

b. to increase the conductivity of electricity// to make water a better conductivity.

c. I) q: p = 10: 5 = 2:1d. Water consist of 2 hydrogen atoms & 1 atom oxygen

Accept: correct drawing

a i) fulcrum is in the middle // fulcrum is between the load and effort// the load & effort act in the same direction ii) scissors / pliers / claw hammer/ can opener accept: any suitable first class device.

iii) effort is less than the load// use lesser/ smaller effort b i) P 1: the see saw will be not balance/ imbalance // boy N will go upwards// boy M moves downwards/ P 2: the movement of force of M is greater / bigger// The moment of force of N is lower / smaller// the moment of force of M is bigger / smaller that M is vice versa.

1 m

Any -1 m1 m

Any 1- 1 m

1m 1m

Total : 6m

1 m1m1 m

1 m1 m

Total : 6m

1 m

2 m

1 m

1 m

4

O H

H

6

b ii. M moves towards the pivot/ fulcrum.

c.

a. Radiation b. i.

note: accept the arrow drawn outside the box.

ii. P1: P / black surface / dull surface absorbs more heat ( compare to Q / silver surface/ white surface) P2: Air in conical flask P expand more

P3: volume of air in conical P increases more

P4: ( The air in conical flask P pushes the red ink towards Q)

c.Chemical energy heat energy kinetic energy

d i. white

ii.P1: ( white colour) reflect more heat/ absorb less heat

P2: temperature in the house lower/ the condition in the house cooler note : reject any reason relate to black and brown surface.

1m

1 m1 M1 m

Any 2

1 m

1 m

2 m

Total: 8 m

5

/

7a) P : hydrostatic skeleton

Q : endoskeleton R : hydrostatic skeleton S : exoskeleton

b, i. aquatic / marine /sea/ ocean

reject : water/ any fresh water habitat

ii. water support the body weight// ( the body can be supported by ) water buoyancynote: b (ii) is independent of b(i) in condition the answer in b(i) is aquatic habitat.

Eg: b (i) = lake(x) b(ii) ; lake water support the body weight(/)

4 m

1 m

4 m

Total: 10m

6

8.

a.i) the air pressure of the tyre of the bus is higher ( than the car)// vice versa

ii) the higher the size of vehicles the higher the air pressure in the tyre // vice versa// when the size of the vehicles bigger/ increases the air pressure in the tyre increases// vice versa

b i) 40 o C = 108 / 108.5/109 50 o C = 112

60 o C = 115

70 o C = 119

4 correct = 2 marks2-3 correct = 1m1 correct = 0 m

ii) the air pressure /reading of B. gauge depends on/ influence by the

2 m

1 m

2m

7

P, Q, R and S

Hydrostatic skeleton Endoskeleton

exoskeleton

P, R/ Worm and jellyfish

Q S / grasshopper

Air Pressure,kPa 120

115

110

105

100

temperature.

The temperature affects the air pressure //

The higher the temperature, the higher the air pressure/ reading of B. Gauge// vice versa

As the temperature increases the air pressure increases

c. Manipulated variable: temperature( of water) Responding variable: air pressure / B. Gauge reading

d.

8

30 40 50 60 70

Temperature, oCCorrect all points = 1 m Smooth straight line = 1m

e. Air pressure is the reading of Bordon Gauge.

2m

1 m

Total :10m

9