jawapan sains pmr mid year 2008

PEPERIKSAAN PERTENGAHAN TAHUN 2008

SKEMA PEMARKAHAN SAINS

(KERTAS 1 & KERTAS 2) 55/1 & 55/2

SEKTOR SEKOLAH BERASRAMA PENUHKEMENTERIAN PELAJARAN MALAYSIA

SKEMA JAWAPAN KERTAS 1

PEPERIKSAAN PERTENGAHAN TAHUN SETARA SBP 2008SCIENCE

TINGKATAN 3

BIL KONSTRUK ARAS JAWAPAN STIMULUS1 KSNR020101 T B2 KSNR020101 S A DIAGRAM3 KSNR010201 S B DIAGRAM4 KSNR010201 R B DIAGRAM5 PSNR010203 R A6 KSNR010501 S C7 KSNR020202 T D DIAGRAM8 KSNR010402 T C TABLE9 KSNR020102 S A10 KSNR020102 T A DIAGRAM11 PSNR010301 R A12 KSNR020101 S B DIAGRAM13 PSNR010102 R B DIAGRAM14 PSNR010301 S A DIAGRAM15 KSNR010201 S D TABLE16 PSNR010301 S C17 PSNR010203 S D DIAGRAM 18 PSNR010202 S C19 PSNR010101 R C20 PSNR010301 R B21 KSNR020202 T C DIAGRAM22 KSNR020102 S D23 KSNR020101 T C24 KSNR010501 S D25 KSNR010201 R C DIAGRAM26 KSNR010201 R C DIAGRAM27 PSNR010101 R B28 PSNR010102 R A29 PSNR010102 R C DIAGRAM30 PSNR010102 R B31 KSNR010201 R D DIAGRAM32 KSNR020102 S D DIAGRAM33 KSNR010501 R B DIAGRAM34 PSNR010102 R A35 PSNR010102 R A DIAGRAM36 KSNR020101 S C37 PSNR010101 R A DIAGRAM38 KSNR010201 S D DIAGRAM39 KSNR010401 S C DIAGRAM40 KSNR010201 R B

SKEMA PEMARKAHAN KERTAS 2

PEPERIKSAAN PERTENGAHAN TAHUN SETARA SBP 2008 SCIENCE

TINGKATAN 3

QUESTIONS RUBRIC MARKS

1 (a) (i) 1

1

1

3

(ii)

Structure Functions

1

1

1

TOTAL 62 (a)

1

1

13

(b) Protects the seeds 1 1 (c) Germinate 1 1

Nucleus

Guard cell

Stomata

P PpPpP

Q QQQQQqQ

R RRRqR

control all activities of the cell

control the opening and closing of the stoma

allow the water vapor passes out of the leaf

carries out photosynthesis

PlumulepLUMULE

RadicleTesta

(d) Avoid the seed from expose to air, water and suitable temperature for germination / put inside the airtight container and store in the refrigerator

Notes : Accept any suitable answer Do not accept if store in the freezer.

1 1

TOTAL 63 (a) (i) White to brownish 1 1

(ii) Tar 1 1 (b) Acidic // contain carbon dioxide 1 1 (c) Heart disease // emphysema //asthma // bronchitis //

cough // Lung cancer1 1

(d) (i) Nicotine // tar // carbon monoxide(ii) Carbon monoxide // tar // carbon monoxide

Notes : Accept any suitable answer 2 correct = 1marks, 3 correct = 2 marks

11 2

TOTAL 64 (a) Paddy and waterweeds 1 1 (b) (i) Paddy plant mouse snake

eagle(ii) waterweeds small fish big fish

11 2

(c) Snake and big fish 1 1 (d) (i) The snake will decrease / the paddy plant

increase(ii) The number of small fish increases / the number of waterweeds decreases

11 2

TOTAL 65(a) (i) Thermostat

(ii) Fire alarm / electric iron / Bimetallic thermometer / refrigerator

11 2

(b) Expansion 1 1

(c)

(i)

1 1

(ii) - brass expands more / faster than iron //- the bimetallic strip bends / curves downwards.

1 1

(d) (i) - the fire alarm gives out warning // - the bell rings.

1 1

(iii) - the strip bends- touches the contact screw- the circuit is completed- the bell rings.

1

1 2

brass

iron

TOTAL 86(a) (i) A suction pump 1 1

(ii) To clear the blockage of pipes / to unclog sinks

1 1

(iii)

Note : Both X and W must correct

1 1

(b) - the air is forced out- the air pressure inside the rubber cap reduced- the higher outside / atmospheric pressure hold the

rubber cap / plunger (firmly)- the higher air pressure in the pipe pushes the

blockage

1

1 2

(c) J – Don’t put hot pan / wok on the gas cylinderK – Place the gas cylinder far from the stove L – Don’t store the gas cylinder in the closed cupboard

111

3

TOTAL 87(a) J : Load is in between fulcrum and effort//

Second class leverK : Load is in between fulcrum and effort// Second class leverL : Fulcrum is in between load and effort// First class leverM: Fulcrum is in between load and effort// First class lever

1

1

1

1

4

(b)

1

1

1

1

4

8(a) The swing of pendulum from point X / released point, to point Y back to point X again.

1 1

(b) (i) Manipulated variable: The length of the pendulum / string(ii) Responding variable: The time taken to make ten complete swing (iii) Constant variable: Mass of pendulum // Number of swings // any related answers

111

3

(c)

Notes: 4 corrects = 2m 2 @ 3 corrects = 1m

11 2

(d) Refer to appendix 1:

At least 4 points mark correctly = 1 markThe shape of graph is a straight line graph = 1 markThe smooth line of graph = 1 mark

111

3

(e) Directly proportional // The longer the strings, the lower the time taken

1 1

(f) 35 s (+ / - 1 cm) 1 1(g) 30 s / 10 swings = 3 s (unit is optional) 1 1

TOTAL 12

Load is in between fulcrum and effort // Second class lever

Load is in between fulcrum and effort // First class lever

WheelbarrowNutcracker

Nutcracker

HammerPliers

Plier

Length of pendulum (cm) 0 15 30 45 60 75 90

Time taken for ten complete swings (s)

0 10 20 30 40 50 60

APPENDIX 1

Tim

e ta

ken

for

ten

com

ple

te s

win

gs (

s)

10 20 30 40 50 60 70 80 90 100Length of pendulum (cm)

100

80

60

40

20

0

00

X

X

X

X

X

X