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Name: lndex Number: Class:

YIO GHU KANG SEGONDARY SCHOOLEN D-OF.YEAR EXATVIINATION 2416SECONDARY TWO EXPRESS

sgENcE (PHYSIGS)

Friday 7 October 2416 2 hours(For Biology and Physlcs)

No Additional Materials are required.

READ THESE INSTRUCTIONS FIRST

lffrite your name, index numberand class on the cover page.The Science Examination consists of two components: Science (Biology) and Science (Physics).You are required to complete the two components in two hours.

Write in dark blue or black ink-You may use a soft pencil for any diagrams or graphs.Do not use staples, paper clips, glue or conection fluid.

SECTION A: Multiple Ghoice QuestionsThis section consists of ten multiple choice questions. Answer all questions.For each question there are four possible answers A B, C and D.Choose the one you consider conect and record your cholce in the bracket provided.

SECTION B: Structured QuestionsThis section consists of structured questions. Answer all questions.Write your answers in the spaces proMded,

The number of marks is given in brackets [ ] at the end of each question or part question.

The use of an approved scientific calculator is expected, where appropriate.

For Examinefs Use

Parenfs / Guardian's signature

Name of Setter: Mr Phua Yong Bin

Section A I 1 0

Section B lqaTotal /so

This document consists of 15 printed pages and I blank page.

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2

SECTION A [10]: Multiple Choice euestionsAnswer all questions in the brackets provided.

1 Which of the following is an example of a contact force?

electrostatic force

friction force

gravitational force

magnetic force

Ght

400 N

500 N

0.5 m

what is the direction of the moment due to the weight of the boy?

anticlockwise

clockwise

downward

upward

A

B

cD ( )

2 The picture below shows two children on a see-saw. The boy weighs 400 N and the girlweighs 500 N. Both children are 0.5 m away from the pivot.

AB

cD ( )

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3

3

A ball is thrown straight up into the air. lt moved from-P to Q as shown in Fig 3.1 anddropped from Q to P as shown in Fig 3.2.

P

Fig 3.1

Which one of the following is conect?

Potential enerqv of bpllfrom P to Qdecrease

decrease

increase

increase

P

Fig 3.2

Kinetiq energy of ballfromQtoPdecrease

increase

decrease

increase

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)

)

o ii"

ii

AB

cD

4 A hearing aid is attached to the ear to help people who suffer from hearing loss.

What is the main function of a hearing aid?

To decrease the amplitude of sounds sent from the sunoundings.

To decrease the frequency of sounds sent from the suroundings.

To increase the amplitude of sounds sent from the sunoundings.

To increase the frequency of sounds sentfrom the surroundings.

(

(

A

B

cD

o

o

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5

4

Fireworks is the main highlight of every year's National Day parade.

Edward said that it took 4 seconds for him to hear the fireworks, afler seeingthem explode in the night sky.

lf sound travels at 300 m/s, how far away was Edward from the fireworks?

A 75m

B 120m

C 600m

D 1200 m

6 Blue and yellow light are shone on a white screen as shown in the diagram below.

yellow

What colour is region Y?

( )

AB

cD

)

AB

cD

blue

green

yellow

white

The beam will be reflected as convergent rays of light.

The beam will be reflected as diffused rays of light,

The beam will be reflected as divergent rays of light.

The beam will be reflected as parallel rays of tight.

( )

7 Which of the following statements conecfly describes how a paratlel beam of light will bereflected when it hits an uneven surface?

(

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8

5

Amy looks at herself in front of a plane minor.

Which of the following statements conectly describes her image?

Her image appears to be laterally inverted.

Her image appears to be nearer.

Her image appears to be real.

Her image appears to be smaller.

9 Which of the following statements is he definition of cunent?

Current is defined as the flow of chage per resistance.

Curent is defined as the flow of charge per unit time.

Current is defined as the flow of charge through a component,

Curent is defined as the flow of electricity.

l0 Study the circuit below. All bulbs and baftery are in wo*ing condition

+

B c

which one of the following correctly states the number of bulbs that wouldstitl be lit, when one or more bulbs are disconnected?

Bulb(s) disconnected

A

B&Dc

E&F

A

B

cD

A

B

cD

(

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)

()

E

Number of bulb_(s) still lit

A

B

cD

1

2

3

4 )(

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6

SECTION B [40J:Structured QuestionsAnswer all questions in the spaces provided.

11 Fig 11.1 shows an experiment conducted by an engineer, to testthe sofiness of soil. Theengineer places a brick on the soil and measures tho depression caused by the brick.

brick

ruler

depression

soil

Fig 1't.1

Which face of the brick, A, B or C, would cause the deepest depression?Explain your answer.

li

t2l

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12 (a)

7

Fig. 12.1 below shows a book at rest on the table.

Fis 12.1

On the picture above, draw anows to represent the weight and normal contactforce acting on the book. Label the forces drawn. l2l

(ii) lf a horizontal force is apptied on the book, state the change in motion of thebook

i1l

(b) The book is now placed on a mass balance, as shown infig. 12.2 below.

Fig 12.2

(i) State the mass of the book in kg.

mass = kg [11

(ii) Taking acceleration due to gravity to be 10 m/sz,

Calculate the weight of the book.

(i)

0nms

i00

weight =,..........-. N [1J

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13

8

Fig 13.1 below shows a father carrying his baby home from the carpark and climbing upthree levels of stairs to his flat. The carpark is 20 m away from the stairs and each level ofthe flat is 2.5 m high.

2.5 m

2.5m

2.5 m20m

Fig 13.1

(a) The father weighs 600 N and the baby weighs 50 N.

(i) State and explain the work done by the father in carrying the baby as hewalks from point A to B.

AB

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(iU Calculate the work done by the father when he climbs three levels up thestairs with his baby.

Work done = .............J 12)

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14 Fig 14.1 shows a parlicular sound wave.

amplitude / rn

4

2

time / s

Fig.14.i

(a) On the axis provided below,(i) draw a sound wave which has twice the loudness as the originalsound.

amplitude/m

4

2

time I s

(ii) draw a sound wave which has twice the pitch as the original sound.

amplitude I rn

-2'

4

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0

-2

4

2

time / s

(b) Explain why sound energy travers faster through solids than through air.

-4

tzt

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15

10

One of nafure's most splendid masterpieces is the rainbow. Fig. 15.1 shows a light raystriking a raindrop.

incident

Fig.15.1

(a) The part where light ray strikes on the surface of the raindrop has been magnified in

Fig. 15.2and 15.3below. Partof thelightrayisreflectedwhileanotherisrefractedas it enters the rain drop.

(i) ln Fig 15.2, draw and label the normal and the reflected ray.

arwater

incident

Fig.15.2

(ii) State the angle of reflection.

angle of reflection = .-.... o t1l

(iii) ln Fig 15.3, draw and labelthe normaland the reftacted ray.

arrwater

incident

Fig. 15.3l2I

(iv) State if the angle of refraction is bigger than, equal to or smaller than theangle of incidence.

ray

ray

600

t2l

ray

nl

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11

(b) Explain how a rainbow can be formed from visible white light in nature.

t21

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12

.l6 Fig 16.1 below shows a schematic diagram of the electrical circuit in Mr Goh's house.

supplycunent

Dt-'s E - E! circuit brcaker

fuses

(a) (i)

Fig.16.1

Explain how the fuses protectthe appliances from being damaged.

(iD State one difference between a circuit breaker and a fuse.

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(o

a

o?oof

=ooo

E(oo

I

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13

(b) Fig. 16.2 berow shows the righting circuit for Mr Goh,s riving room.

two way switch

Fig.16.2

(i) Each light butb has a resistance of 20 O.

calculate the efective resistance of ail three right burbs when they areconnected.

Effective resistance =............. O L2l

(ii) Explain howthe two unay switch works.

(iii) suggest one location in the house where the two-way switch wourd beuseful.

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(iv) Mr Goh wishes to instafl ? fg-urth tight burb in his riving room which can beswitched on or off without affectinf the other bulbs.

Draw on Fig. 16.2 above to show how this light bulb should beconnected to the existing circuit

t11

i1l

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14

17 State one advantage and one disadvantage of generating electricity frOm a hydroelectric

power plant.

State one effect of an electric cunent and provide an example of its application-

Fig. 1 9.1 below shows the packaging for a 60 W LED light bulb'

Fig.19.1

(a) Explain what'60 W' means.

12)

l2l

18

,l9.

n1

s.1rUI g:l

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(b) A 240 W light bulb and a 60 w LED tight butb were both switched onfar Z4hours.The cost of etectricity is $ 0.2S /kwh.

caleulate how much money can be saved by using the LED right burb.

Savings = $

20 Fig 20'1 below shows Mr Goh's eleckfcal socket connected to multiple plugs, with allofthem switched on at the same time.

Fig.20.1

Describe the electricar hazard that wourd possibry occur from Fig.20.1

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END OF PAPER

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YIO CHU [(ANG SECONDARYSCHOOLMARKING SCHEME

Exam: EOY2016

SECTIONA(MCO)

Subject SCTENCE (physics) Level: 2E

0f B is contact.02. B Boymoves

03. D Ball AS Ballgains as falls04. C

05. D

ear can

an uneven

of sent so

taken

+ +

bavelled the x

a

form

Cunent

Distance travelled by the sound = 300 x 4Distance travelled by the sound = 1200 m

06. D

07. B

08. A

09. B

10. B B&D still up.

1

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SECTION B

11111

[1] for eachcorrect arrowAND label.

weight

Normalforce

12

ans

n111lis perpendicular to that of dislance

TheOR force

13

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(aii) 'oi'rie x distance rnovedWt done = F

fil any one

[1] any oneOne disadvantage is that it requires a larqe amount of land to be-floo-dqd OR

d';s!L;;s ;;;;v;igm due ro flood'mo oR it prevents nutrients from flowing down

a river.

itpollutants OR, it uses renewable source of enerqv.

of power plant4

effectapplication

application

OR;

An effect a current

OR;tisht bulbeffect.lightinoeffect,

OR;

2

area.ASdefinedis per unitforce actingPressure

(ai)

Workd.one = 650 x7-SWorkdorv = 4875!

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b ai)

time / s

Same frequency, amplitude dou bled.

-2

4

amplitude / m

4

2

t1I

Same amplitude, frequency doubled (Two cydes within same time..

time / s-2

-4

amplitude /m

4

2

11l

by the particles.

1SitTherefore,aAs sound travelsresult, faster solidln than atr

energy ist1l

tlI

17

raynormal

incidentny

600

ray accuratetl reflected

reflection = o

incidentray

raY

J refractedray bendstowardsnormal

tl[1

3

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(aiv) rs t1I

(b) ll ltll

18 (ai) When excessive cunent enters circuit,

the

t11

(aii) circuit breakerto

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(bD ffi1111

-=-+-+-Rroto, R1 ' Rz ' R3

1 :1*1*1Rrorot 20' 20' 20

13Rrotot 20

Rrrtor 20

l'3I orr,o, = 6'6? o

[1] working

FI ans

[1] extensionby parallelwith swtich

When one can t1l(biv) t1l

within 1 second.60w ofI[1] Energyusage by bulblllEnergyusage by LEDFI savings

Energy usage of LED bulb = 0.06 kW x

Savings = (5.76- 1.M)x 9.25 = $ 1.08

415 = 91.08

24 5.KW x 76usagekwh24 .441

20 Elechicalfirq is likely to occur assocket/mains when all appliances arg on at the same time.

n1f1l

Thus

(bii)

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(b)