SECTIONA: [40marksl

Answer all questions

flhe time suggested to answer this section is 60 minutes.l

1 Diagram 1.1 and Diagram 1.2 show sour@s of energy.

Diagram 1.1

In the spaoes provided on Diagram 1.1sources of energy.

[2 marks]State the energy changes u/hich o@ur in Diagram 1.1.r

[1 mark](c) Based on Diagram 1.1 aN 1.2, state two advantages of any of those

' sources of energy.P

1. .1. . . . . - .

Az. . . . . . . . \ .[2 marks]

(d) State two uses of the sources of energy in Diagram 1.2.

-

)Diagram 1.2

and Diagram 1-2, name the(a)

(b)

I1.

2.[2 marks]

Diagram 2 shows the set up of an experiment to investigate the absorptionof heat by two different surfaces.

thermometer Y

coatadwith

ill"?** s.oc shiny white

( i )

after 1Oninutes

*

{-8cm *-8crn *

Diagram 2

\Nhat is the temperature in thefollowing conicalflasks after 10 minutes?

[2 marks]

(d) How is heat transfened to thermometer X and Y from Bunsen burner?

[1 mark]

(e) \N['ry is the temperature in flask X higher than that in flask Y?

(0 Write an example in

everyday fife?

[1 markJ

\rhich the principle of heat absorption is applied in

[1 mark]

3. Diagram 3 shows a food wed.

(a)

Diagram 3

Based on Diagram 3, which organism represents

1. a primary consumer?

2. a tertiary consumer?

[2 marks]

(b) Construct a simple food chain from the above food web.

[1 mark]

(c) \Mat kind of interaction between mouse and snake?

[1 mark]

(d) What happen to the mice if the population of snakes increase?

[2 marks]

A student canies out an experiment to investigate the situation in the

following diagram which shows the arrangement of apparatus for the

experiment.

Sunlight Sunlight

// //

sodium hYdroxidesolution

Plant B

(a)Whatistheproblemstatementforthisexperiment?

Plant A

[1 mark]

(b) \fdhat is Your hYPothesis?

[1 mark]

(c) State the variables involved in this experiment'

Manipulated variable

Responding variable

Controlled variable

I

I

(d) Why are the plants kept in the darkfor two days before the experimentsis can'ed out?

I mark](e) (i)\Mat is the function of the sodium hydroxide solution?

[1 mark]

(ii) The leaves from whiclr plant contain starch at the end of theexperiment?

[1 mark]

5 Diagram 5 shows the apparatus used to investigate the oomposition of water.

AB

wabt+2d*ryxofdilute sulphurk acid

a) Name the process of splitting water above.

[ '1,

6

[1 mark ]

-

b) When the switcfr is furned on, bubbles of gases can be seen from each ofthe electrode.

Name the gas collected in

Test tube A:

c)

i t 2 markslI

\Mat type of test can be carried out to identify the gases in test tube Aand test tube B?

Test tube Test

A

B[2 marks]

d) \Nhat is the ratio of the gas in the test tube A and B in terms of volume?

[1 mark]

e) predict the volume of gas in test tube B if 10 crn 3 of gas is collected intest tube A.

[1 mark]

Test tube B :

r

6.. Diagram below shows

hydrochloric acid was

conicalflask

the set-up of an experiment. A

added from the burette into the

few drops of dilute

alkali solution in a

Table below shows the results of the

(a) (i) Name the process that takes place when the acid reacts with alkati.

[ 1 markJ(ii) \tvhat is the volume hydrochloric acid used to neutralise the alkali?

[1 mark]

8

Write down the word equation forthe :eaciion'

F

+

[2 marks]

tested with(i)

[1 mark]

(ii) Write the reason for the observation in (c) (i).

[ 1 mark]

(d) lf solid acid citric is given, what is happened to blue litmus paper when it put

into the solid citric acid-

[1 mark]

7.

SECTIONB:[20marks]

Ansrverc all questions.

ffhe time suggeted to complete this section is 30 minutes.l

Diagram 7 shows a picture of animals, R, S, T, U, and V-

Diagram 7

Based on your observation in Diagram 7,

(a) State one characteristic of each animals R, S, T, U and V.

R:

c'v.

T:

t l .v.

V:[5 marksl

R

S

-tgltfltllll

Eltww

- \ - - l

--T

10

(b) Classify animals R, S, T, U and V in Diagram 7 into two groups based ont-2L^ LL

- | .^A^--

-t /

a common characteristic-Writethe leters of the animals belonging to

each group-

GommonCharacteristic

Letters ofthe animals

[5 marks]

t1

g. The diagnam belorr shonrs two pieces of damp filter papers, one of whiclt is

folded.

ta) \A/hat is the aim of the experiment?

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

i. Constant variable:

i i. Manipulated variable:

iii. ResPonding variable:

[3 marks]

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

t2

[1 mark]

(d) Explain your answer in (c;

[1 mark!

(e) \Mat is the hyphothesis of this experimenP

[1 mark]

(0 What is your conclusion for this experiment?

[1 mark](g) State two

i.

difierences between evaporation and boiiing.

ii.

[2 marks]

13

Mark Scheme Science Form 2 (August 2009)

ItemNo.

Scoring Criteria Marks Remark

l(a) Diagram 2.1 : W ater/ hydro energyDiagram 2.2: Wind/ ar

II 2m

(b)Potential + Kinetic orerg]-; electrical energyenergy

I 1m

(c) I2aJ

4

Renewable energy/reusableDoes not cause pollution/cleanEconomicalUnlimited (any two)

II

2m

(d) 1. Toproduce electrical energy2. To turn turbine3. To turn windmills4. To move sailing ships (any two)

II

2m

Total 7m2(i) X:38.9oC

Y= 32.5oCII 2m

(d) By radiation I lm(e) More heat has been transferred/absorbed into conical

flaskI lm

(f) People in cold countries wear black clothes in the dayto help them absorb more heat from the sun

OrOil trucks/tanks are painted shiny white to reduce theabsorption ofheat(either one)

I

1m

,8\JAuw Total 5m3(a) r. P€dcy# ruf I bN lffwtn.otrW2. Eaele/snake

II 2m

(b) Sample answer:Paddyd swalloud snake c) eagleolant

Ilm

(c) Prey predatot I lm(d) The pooulation of the mice decrease 2 2m

.Total 6m

f'

7 (a) R: has scales/tras finsS : has shelVhas antennaT : has shelUhas four legsU : segmented bodY/has manY legsV : has hair or furlhas two ear lobes(any characteristic that can be seen from the figures)

IIIII

5m

(b) Sample answers:Common characteristic :

Groupl :hasshel lGroup2:noshel lLetters of the animals:Group 1 : SGroup 2 : R, T, U, V

5mTotal l0m

8 (a) To tnvesttgate paper P has bigger surface area exposed

to the air II

lm

(b) t Jempe"atute ;f sunoundiny'humid ityii. surface area of filter papef I r,iii. rate of evaooration at filter paper f yi*q4^bq-}D

II

l^l I 3m

(c) P I lm

(d) fte fittet papetF has a bigger surface area exposed to

the air

I lm

(e) The btgger surface are4 the faster the rate of

evaooration takes Place

I lm

(0 fnetate evaporation of water will increase if the

exposed surface area of @

I lm

(e) Sample answers:i. Evaporation occurs at any temperafure'

Boiling occurs at boiling Point'ii. Evaporation happens at the liquid surface'

Boilins haopen throughout the liquid'

I

I2m

Total 9m

L(

4. h) no plants need carbon dioxide fo. photosynthesis? I lm

(b) CarUon Dioxide is needed for photosynthesis I lm

(c) MV: presence of carbon dioxideRV: presence of starch (in leaf)CV: type of plant/presence of light/chlorophyll and

Water (any one)

II1

3m

(d) To remove starch in leaf (so that no starch present at

the beeinning of experimenQ

I lm

(eXi) Absorb carbon dioxide I 1m(e)0i) Plant A I lm

Total 8m

5 (a) Electrolysis I lm

(b) TesttubeA: hYdrogenTesttube B : oxygen

II 2m

(c) test tube A : use burning wooden splinterTesttube B : use glowing wooden splinter

II 2m

(d) 2: I ( A:B) I lm

(e) iCm' I lmTotal 7m

6(a) (i) Neutralization I lm

(aXii 25ml I 1m

(b) Hydroilto.t" acid + sodium hydroxide+ sodiumchloride + water 2

2m

(c) (i) A pop sound is heard I 1m(c) (ii) Presence of hydrogen gas I lm

(d) No change / remain blue 1 lmTotal 7m