Ujian Sains Tingkatan 2

SECTIONA:[40marksl Answer all questions flhe time suggested to answer this section is 60 minutes.l 1 Diagram1.1 and Diagram1.2 showsour@sof energy.

)

Diagram1.1 (a)

(b)

(c)

Diagram1.2

In the spaoes providedon Diagram 1.1 and Diagram1-2,namethe sources of energy.

Statethe energychangesu/hicho@urin Diagram1.1.

[2 marks]

r

[1 mark] Basedon Diagram1.1aN 1.2,statetwo advantagesof any of those ' sourcesof energy. 1. A

z.

P

.1.....-. .......\. [2 marks]

(d)

Statetwo uses of the sourcesof energyin Diagram1.2. 1.

I

2.

[2 marks]

Diagram2 showsthe set up of an experimentto investigatethe absorption of heat by two different surfaces. Y thermometer

coatadwith

ill"?** s.oc

shinywhite

after 1O ninutes *

{-8cm *-8crn

*

Diagram2 (i)

\Nhatis the temperaturein thefollowingconicalflasksafter10 minutes?

[2 marks] (d)

X and Y from Bunsenburner? Howis heattransfenedto thermometer

[1 mark] (e)

\N['ryis the temperaturein flask X higherthan that in flask Y?

[1 markJ

(0

Write an examplein \rhich the principleof heat absorptionis applied in everydayfife? [1 mark]

3. Diagram3 showsa foodwed.

Diagram3 (a) Basedon Diagram3, which organismrepresents 1. a primaryconsumer?

2. a tertiaryconsumer? [2 marks] (b) Constructa simplefood chainfrom the abovefood web.

[1 mark] (c) \Mat kind of interactionbetweenmouseand snake? [1 mark] (d) What happento the mice if the populationof snakesincrease?

[2 marks]

A studentcanies out an experimentto investigatethe situationin the followingdiagramwhichshowsthe arrangementof apparatusfor the experiment. Sunlight

Sunlight

//

//

sodium hYdroxide solution

PlantA

PlantB

(a)Whatistheproblemstatementforthisexperiment?

[1 mark] (b) \fdhat is Your hYPothesis?

[1 mark] (c)

State the variables involved in this experiment'

Manipulatedvariable Respondingvariable Controlledvariable

I

I

(d) Why are the plantskept in the darkfor two days beforethe experiments

is can'ed out?

(e) (i)\Mat is the functionof the sodium hydroxidesolution?

I mark]

[1 mark] (ii) The leavesfrom whiclrplant containstarchat the end of the experiment? [1 mark]

5 Diagram5 showsthe apparatususedto investigatethe oompositionof water.

AB

wabt+2d*ryxof dilute sulphurk acid

['1,

a) Namethe processof splittingwaterabove. [1 mark]

6

-

b) Whenthe switcfris furnedon, bubblesof gasescan be seenfrom each of the electrode. Namethe gas collectedin TesttubeA:

Test tube B :

t 2 marksl

i I

c) \Mat type of test can be carriedout to identifythe gases in test tube A

and test tube B? Test tube

Test

A B

[2 marks]

d) \Nhatis the ratioof the gas in the test tube A and B in termsof volume? [1 mark] 3 e) predictthe volumeof gas in test tube B if 10 crn of gas is collectedin test tube A. [1 mark]

r 6.. Diagrambelow shows the set-up of an experiment.A few drops of dilute hydrochloricacid was added from the burette into the alkali solution in a conicalflask

Table belowshowsthe resultsof the

(a) (i) Namethe processthat takes placewhen the acid reactswith alkati.

[ 1 markJ (ii)\tvhatis thevolumehydrochloric acidusedto neutralise the alkali?

[1 mark]

8

F

Write downthe word equationforthe :eaciion'

+ [2 marks]

(i)

testedwith

[1 mark] (ii) Writethe reasonfor the observationin (c) (i). [ 1 mark] (d) lf solidacidcitricis given,what is happenedto bluelitmuspaperwhen it put into the solid citricacid-

[1 mark]

SE CT I O NB : [ 2 0 m a r k s ] Ansrverc all questions. ffhe time suggeted to complete this section is 30 minutes.l 7.

Diagram7 showsa pictureof animals,R, S, T, U, andVR

S -t gltfltllll Elt ww

- \- - l

--T

Diagram7 Basedon your observationin Diagram7, (a) Stateone characteristicof each animalsR, S, T, U and V. R: c'

v.

T: tv.l.

V:

[5 marksl

10

(b)

ClassifyanimalsR, S, T, U and V in Diagram7 into two groupsbasedon a common characteristic-Writethe leters of the animalsbelongingto t-2L^

LL

-

|

.^A^--

-t

/

each group-

Gommon Characteristic

Lettersof the animals

[5 marks]

t1

g. The diagnambelorr shonrstwo piecesof dampfilter papers,one of whiclt is folded.

ta) \A/hatis the aim of the experiment?

[1 mark] (b) Name the following variables: i.

Constantvariable:

ii.

Manipulatedvariable:

iii.

ResPondingvariable: [3 marks]

(c) \A/hichfilter papr will dry up first?

[1 mark]

t2

(d) Explainyouranswerin (c;

[1 mark! (e) \Mat is the hyphothesisof this experimenP

[1 mark]

(0 Whatis yourconclusion for thisexperiment?

(g) Statetwo difierencesbetweenevaporationand boiiing.

[1 mark]

i.

ii.

[2 marks]

13

Mark SchemeScienceForm2 (August2009) Item No. l(a)

ScoringCriteria Diagram 2.1: W ater/hydro energy Diagram2.2: Wind/ ar

Marks

Remark

I I

2m

I

1m

(b) Potential + energy (c)

2(i) (d) (e) (f)

3(a) (b)

(c) (d)

electrical energy

I Renewableenergy/reusable 2 Does not causepollution/clean a J

(d)

Kinetic orerg]-;

4 1. 2. 3. 4.

I I

Economical Unlimited (any two)

Toproduceelectricalenergy To turn turbine To turn windmills To movesailingships(anytwo)

X :3 8 .9 o C Y= 32.5oC By radiation More heat has beentransferred/absorbedinto conical flask People in cold countries wear black clothes in the day to help them absorbmore heat from the sun Or Oil trucks/tanks are painted shiny white to reduce the absorptionofheat (eitherone)

,8\JAuw r. P€dcy# ruf I bN lffwtn.otrW 2. Eaele/snake Sampleanswer: Paddyd swalloud snake c) eagle olant Prey predatot The pooulationof the mice decrease

2m I I

2m Total I I I I

7m

2m lm

lm

I

1m Total

5m

I I

2m

I I

lm lm

2

2m

.Total

6m

7 (a)

f' (b)

8 (a) (b)

(c) (d) (e)

(0 (e)

I I I I I

fins R: has scales/tras S : has shelVhasantenna T : has shelUhasfour legs U : segmentedbodY/hasmanYlegs V : has hair or furlhas two ear lobes (any characteristicthat can be seenfrom the figures)

5m

Sampleanswers: Common characteristic: Groupl:hasshell Group2:noshell Letters of the animals: Group 1 : S Group 2 : R, T, U, V

5m Total I

To tnvesttgatepaper P has bigger surface areaexposed I to the air

ity tJempe"atute;f sunoundiny'humid ii. surfaceareaof filter papef I r, at filter paper fyi*q4^bq-}D iii. rateof evaooration

l0m lm

I I

l^l

P fte fittet papetF has a bigger surface areaexposedto the air The btgger surfaceare4 the faster the rate of evaooration takes Place fnetate evaporation of water will increaseif the exposedsurfaceareaof @ Sampleanswers: Evaporation occurs at any temperafure' i. Boiling occursat boiling Point' Evaporation happensat the liquid surface' ii. Boilins haopenthroughoutthe liquid'

I

3m

I I

lm lm

I

lm

I

lm

I I Total

L(

2m 9m

4. h) (b) (c)

(d)

(eXi) (e)0i)

no plants need carbon dioxide fo. photosynthesis? CarUonDioxide is neededfor photosynthesis MV: presenceof carbondioxide RV: presenceof starch(in leaf) CV: type of plant/presenceof light/chlorophyll and Water (any one) To remove starch in leaf (so that no starchpresent at the beeinning of experimenQ Absorb carbondioxide Plant A

5 (a) (b)

Electrolysis

(c)

test tube A : use burning wooden splinter Testtube B : use glowing wooden splinter

(d)

2: I ( A:B)

(e)

iCm'

6(a) (i)

Neutralization

(aXii

25ml Hydroilto.t" acid+ sodiumhydroxide+ chloride+ water

(b)

(c) (i) (c) (ii) (d)

T e sttu b e A : h Y d ro gen TesttubeB : oxygen

A pop soundis heard Presenceof hydrogengas No change/ remain blue

I I I I 1

lm

lm

3m I

lm

I I Total I I I I I I I Total I I

1m lm

8m lm

2m 2m lm lm

7m lm

1m

sodium 2 I I 1 Total

2m 1m lm lm

7m