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sECz/SCl [SA2] 239
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.
sECz/SCl [SA2] 240
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
SEC2/SCI [SA2] 241
)
)
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
sEcz/sct lsA?) 242
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
(
sEC2/SCt [SA2] 243
)
()
E
Number of bulb_(s) still lit
A
B
cD
1
2
3
4 )(
sECz/SCr [SA2] 244
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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sECz/SCt [SA2] 245
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
SEC2/SC] [SA2] 246
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
t21
(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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I
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
sECz/SCt [SA2] 247
t1I
t1l
0
-2
4
2
time / s
(b) Explain why sound energy travers faster through solids than through air.
-4
tzt
sECz/SCl [SA2] 248
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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sEC2/SCt [SA2] 249
11
(b) Explain how a rainbow can be formed from visible white light in nature.
t21
sEC2/SCl [SA2] 250
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.
t1l
t1I
(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.
t1I
(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
sEc2/SCl [SA2] 252
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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15
(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
sECz/SCt [SA2] 25s
t3l
tzt
END OF PAPER
',.t-t ..
SEC2/SC! [SA2] 255
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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sEC2/SCl [SA2] 256
SECTION B
11111
[1] for eachcorrect arrowAND label.
weight
Normalforce
12
ans
n111lis perpendicular to that of dislance
TheOR force
13
n1t11
(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!
sECz/SCt [SA2] 257
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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sECz/SCl [SA2] 258
(aiv) rs t1I
(b) ll ltll
18 (ai) When excessive cunent enters circuit,
the
t11
(aii) circuit breakerto
t1l
(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)
t1t
(b)