2008 Maris Stella Sec4 Express

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1 In using a measuring cylinder to measure volume of a liquid, which of "thl

following is an unnecess8/yprecaution? "

A The cylinder is not tilted .

B The reading 'is taken at the bottom of the meniscus.

C The liquid s!Jrface is h?rizontaL

D -rhe bench surlace is horizontal.

2 When comparing systematic and random errors. the following pairs of

properties of errors in an experimental measurement may be contrasted

Pl : error can possibfy be eHmrnatedP2 : error cannot possibfy be eliminated-0 1 : errOf"is"of constant sign and magnitudeO2 : error is of varying sign and magnitude ..!

Rl : error wiU be reduced by averaging repeated measurements ../R2 : error wjJl not be reduced by averaging repeated measurements

Which properties apply to random errors?

A

_."_, "BCD

'P, . Q1 ) R2

·Pl .. 02 f'R2

P:: t 02. I R1

P2 t 0 , Rl

3 The acceleration of free fall is determined by timing the fall of a steel ba

photo-electricaltY. -The ball passes X and Y at tirt:1es tx and ty , after releast

from PA

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poinl0f' ,.release

-,

d

XJi.hl beam

\Ir

photo-

ceil

y

~ r o u n d Q

'\Nhich of he following expression gives the correct' computation of

acceleration? -

A 2h/(tx - ty)

B hJ( ty2

... tx2)

C h2/( tx - ty)

0 2h/(ty2 _ tx

2)

4 A wooden block of mass 2.0 kg .is dragged on the floor by a constant force of

6 .0 N and it moves with a constant velocity of 0.10. m/s as ~ h o w n below. VVhat

is the frictional force acting on the box?

I :.:::: 16 .0N

-----......:

A ON B 0.20 N C 3.0N o S.ON





5 The diagram below shows four spring ·balances connected 10 a knot X. Thestrings attached to the balance are all at 90° with one another .

If knot X stationary, which set of readings (in Newtons) for K, L, M and N are

correct?

K

A 70

B 70

C 70

o 40

L

70

40

40

55

M

40

70

40

55

N·

40

40

70

70

6 A cube, p. with sides 1.0 em long bas a mass of 8 .0 g . Another cube, Q, wifr

sides 2.0 em long is made of a materia] of density twice that of cupe P . V V h ~ 1 is the mass of cube Q1 .... -

B 329 C 64g 0' 128g

7 A cube of side 8.0 em has weight 1.00 N . A force. F.is acting at one {:orner of'the. cube as shown. What is the minimum value of F in order to tilt the cube?

...F

i . .

A 50N

B- 100N

C 150N

0 200N 100N





In one minute . a d i v e ~ breathes 1 Jitre of air at an atmospheric pressure of

100 kPa. To breathe in the same mass of air in one minute. how much air, inlitre. would be needed to breathe when the total pressure on him under wateris 400 kPa? .

A 0.25 C 1 o 4

The diagram shows a manometer connected'to a gas c y n n d e r ~ Theatmospheric pressure is 76cmHg . What are the pressures at,P'andQ?

A

B

C

D

Pressure at P

o

46

.76

76

Pressure at Q

30

106

106

"46

10- The ·flgure below shows the various positions•.at equal time intervals, C!f amarble rolling from A through B to C on a smooth surface that is uneven.(Assume that acceleration due to gravity = 10 '!l/s2).

B

A : 2.0m

What is the velocity, in mIs, of the marble at C?

A. 6.3 B. 7.0

C . 8.1 D. ,9.9

' ..





11 A meteorite of mass 10 kg' enters the Earthfs atmosph.ere and its velocity is

reduced· from 99 m/s to 1 m/s by air resistance. The .work done, in JouJesagainst resistance is. . -

A 980 B 9900 C 49000 O· 490000

12 I.n a Brownian motion experiment involving smoke particles- in the air, heavy.particles settle quickly but very small particles rer:nain s\Jspended for a long,petiods of time . This is because .' .

A' air pressure has a greater effect on smaner particles .

B the small smoke particles have the same density as 'air.

'. C the Earth's gravftational field does not act on very smaU particte. .

o random molecular bombardment by air- molecules·· keeps the particlessuspended .

13 A· smooth piston and cylinder combination is placed horizontally as shown

\JVhat will decrease when the piston is pul1ed to the right?

(i) temperature of trapped

(ii) pressure of trapped air

(iii) volume of trapped air

tmppcdair

A (i) only

B (i) and (ii) only

C . (i) and (iii) _only

D (i)1{ii) and (iii)

. 1indercy ..

. piston

j





14 Two copper cans were filled with boiling water as shown. One can was

insulated with wool. The temperature of the water in each can was taken

every minute. \J\Ihich graph shows the resufts obtained?

. thermometer

Can 1

VVhich g r a p ~ shows the results obtained?

A

c

Temperature/·Ctoo

roamtemp.o ~ - - - - - - - - - - - - - - -time I tninutes

Perab.1rel-C

' .....

.....-....

- - -_ can 1......_-- .

can 2

15 Which one of the fol1.owing is true?

B

D.

woolCan 2

lme-/ainute&

TieJ'l1l;»enlllmr!JI ·C100

.'

/" .'.

A Sea breeze happens during night time when-the sea is cooler t ~ a n . - t h e · · - . - ,. • r-

land." . ~ . . ' c.

B Sea breeze happens d u r i n ~ t f a y time when the land· is cooler than tJ:re

sea. .

C Land breeze happens. during night ime when the I ~ h d is cooler than thesea.

D Land breeze happens during day time when the .sea is cooler than th&-.." -land. . . '. .. '





16 An ice cube at a temperature of O°Cis· put into a drink at a temperature 01

1 0 ~ C .. After a short time during cooling, some of the ice has melted and the

drink has cooled to a temperature of 8

a

C..

\Nhat is the temperature of theremaining ice?

B 2-tlC o SoC

17 Alex was .aoing an experiment and found that the' thennometer was not

s u i t a b f e ~ H e · replaced itwith another thermometer with a . ongercapillary tube .

VVhat are the changes he would get in .terms of response. sensitivity and

range?

Response SensitMty Range

A Decrease Increase No ~ h a n g e B No change Increase Decrease

C No change No change fncrease

D Decrease Decrease tncrease

18 Two blocks, X and Y. are made of the same metal and are heated ,by h e a t e r ~ wit" the same power rating. The graph below s h o w s ~ the variation :01

. temperature with time.

Temoorature

°c 80

60

40

20

0

- - -The ratio of the mass ofX to that of Y is

A · ..3:1 B 3 ~ 4

:X

y

C 1:3':

"\.

time

min

D 1:4





19 beaker containing 0.100 kg of water is kept bolJing by a 1.0 kW hot plate.

E ~ i m a t e the time required to boil off the water completely if 20% of thethermal energy is lost to t h ~ surroundings. (Take the specific latent heat ofvaporization afwater to <be 2.3 )(-106 JJkg). .

A 2305

o

o

o hotplate

B 2885 C 1150 s o 23005

20 Data transmitted along glass-fibre is in the form of pulses of monochromaticred light each of duration 2.5 ns.-Which of the following the best estimate of

the number ofwavelengths in e a ~ Q pulse? -

21 As water waves travel from deep into shallow regions. its_ _ _ _ _ __remains constantA period- C wavelength

B wavefronts D' velocity

.22 A girl of height 1.6 m stands 0.5 m in front of a vertical- plane mirror. V\lhat is -

the m i ~ i m u m length of the mirror which will anow- the girl to see the whole of~ ~ ~ -

A O.5m- B O.8m C 1.3 m D 1.6m





23 Marcus arranges an Hluminated objectt a lens and a screen s.uch 1hat the size .of the image obtained is twice that of the object. Keeping the distancebetween the s c ~ e e n and the illuminated object fixed, he exchanges the

p o ~ i t i o n s of the screen and the illuminated object. What would be observed onthe screen?

A A blurred. magnified image.

B A blurred t diminished ·image.

C A sharp image that is twice the size .of the,:object.·

o A sharp image that is half the size of he object .

24. The ray diagram. below shows the- refraction of a light ray at three parallel

i n t e r f a c ~ s among four media. VVhich of the following statements must be trueifonly rays QR and ST are paralJel?

(i) The refractive index of medium 1 is the J a r g ~ t among the four media.

. (ii) Medium 2 and medium 3 are of the same thickness.

(iii) Medium 2 and medium 4 have equal refractive jndices.

A

B

(0 only

(iii) only

C

D

Medium 1

M.edium2

- Medium3

Medium 4

".'1

(i) and (ii) only

(ii) and (iii) only

25 Jhe diagram shows . ~ h e ~ e l a t l o n s h i p . between the energy' of electromagnetic'- radiation and the wavelength of the w a v e s ~ VVhich of the following has the

lowest energy? . ' .-





A Infra-red

B Microwaves

C Ultra":'vioJet

0, ,X-rays

26 Which of the following waves can be used in physiotherapy?

A Gamma raysB Infra-red raysC Microwaveso Ultra-violet rays

27 '. Ultrasonics (sound of high frequencies) is not use<f in the air force radar

defencesystem.

Whichof

thefollowing

isthe

mainreason?

A It is a longitudinal wave.B It cannot pass through a vacuum.C rt cannot be'reflected by metanlc bodies of aircraft.o Its speed' in air, which 1s 330 mis, Is too slow.

28 Amanda standing at X. between, tWo paraJle-1 walls fires a pistol. She hearstwo loudest echoes 1.0 s and 1.5 s later after firing. VVhat is the distance

between the two walls? (Take speed of sound in air to be 340 mls).

,x•

A 340m B 425m C 595m·. D 8s<tm





.'" '

29 Two identical neutral light conducting balls are suspended by insulating threac

and touching each other as shown in the figure beJow. VVhich of the forJowing

shows the position of the bans after a heavy positively-charged sphere is

placed near them?

A c

B o

30 Wire X and wire Y has 1he following ratios for their physical properties:

lenithLx ' 2- - - - : - ' . -- = - resistivityPx' 3_ _ _ _ _ _ _ _ _ _ _ _ :::::r --iameterDx . 1

---------.-..;;;;.;;;.... IC I -

length!". 3 d z l r m e ~ e r Dy 2 resistivity Pr 4

If the resistance ofwire Y is 6 n, the resistance ofwire X s 0 .

A 0.75 B 1.5 C·9. D 12





31 XY is a 2 m long resistance wire. When XZ =1 .6 m, the voltmeter indicates azero reading .

z

. .

VVhat is the resistance. in ohms, of unknown resistor R?

A 1 B 4 C 8 o 16

32 Point P is a junction jn a. circuit. What is the unknown current I?

SA

A OA C 5A D 10A

33 Hair dryers used at home generally do not have an earth wire. The 'reason is

because.

. A The plug is a l r e a ~ y installed with a fuse.

S The heating element does notdraw too great a current..

C The casing of he hair-dryer is made plastic material.

o The built-in fan prevents the heating coil from becoming too hol





34 Which of the following electrical components win produce results as shown inthe V-I graph below?

V/V

A A switch

B A thermistor

C . A f u n ~ v e rectifier1fA

o . A semicQoductor diode

35 Three lamps A. B •. and C_ are connected to a 220 V s o u r c ~ as shown in thediagram below.. What is the cost per unit of electrical energy if the cost ofoperating lamp B for 50 mins' is $0.551

- 110.n

A $0.11

B $0.42

c

. 0 $0.61

36 Two plotting compasses are placed on a flat table top with a current carryingstraight wire alongside them, as shown in the diagram below .·

Top View

-0-lotting compass

currentdirection





In which directions will the compass needles point?

e, . current

8current

([)direction

·8direction

A C

CD current(3

current

CDdirection

(3direction

B D

37 A very large current is passed through the wire in the direction as shown in thediagram'below. VVhich two lengths ofwire would attract each other?

A YandW c ZandY

B "YandX o XandZ

38 Which one of thefollowing would be the -correct observation when a simple

d ~ c . motor is connected to a_pairofslip rings rather than a" pair ofsplit rings?

A The coil will rotate to and fro after every 9 O ~ B· The coil will rotate to and fro after every 180·

C The coil will rotate continuously, but at a slower rate.

D The coil Will rotate to a particular position, and stop moving a f t e r w ~ r d s . "





39 The diagram below shows a circuit with resistor R and a 12 V d.c" power

supply connected to a transformer" The primary coil has 30 turns whereas the

secondary coil has 180 turns.

30 18012V

R

Turns Turns

VVhat is the potential difference across resistor R?

A OV B 2V C 12V D 72V

40 The waveform shown below is seen on the screen of the Cathode Ray

OscifJoscope. The time base is set at 12 ms/cm and the V-gain is set at 4.0

V J c m ~ Each division on the eRO screen is 1 em.

/I

...-,...

lCIri

' \.

\ J~ V.





VVhiCh of the folJowing correctly represents the peak voH:age and the

~ e q u e n c y of the signal?" .

A

B

8 V; 13.9 Hz

8 V; 27.8 Hz

C .16 V; 13.9 Hz

D 16 V; 27 .8 Hz

End o f P ~ p e r





. -" .. Section A

Answer all the questions on this section.

1 A weight W is suspendedby

two -N e w t o ~

meters X and Yas

shown in the [5]. igure. The readings of.X and Yare 6 Nand·5 N respectively.. By drawing a

scale vector d i a g ~ a m . determine the weightW and the angle Bas shown in-the

figure.

w





2 )n a performance test, a car of mass 800 kg is first accelerated to a velocity ·of

25 m/.s on a dry straight road. After travelling for a while, the brakes are

applied . The figure shows the "results.

speed I m/s

oil.

. -.- -"0

(f ,

-

I. . . ..II \.0

10. / '

- ~ . ' \ . ... 4_w

" " :

."

. f . .

'"-

\

/ ' !\........

(Olf 2 4 6 8 10 12 14 t6 1JJ. 20 22 ,.

(a) What is the resultant force acting on tile car during the time" (2)

(I) t= s to 6 ,s and

(ii) t= 6 s to 1851

(b) If the car is Joaded so-that its total mass is doubled and is accelerated to [3]

25 mis from rest and the total resistive forces acting on the car remains

the same. find the time-taken fo r it to accelerate to 25 mls.





3 The figure below shows a foot p u m p ~ ·which may be used to pump air into cartyres. The figure shows the internal d e t a i l ~ t o f the pump . As the -pedal ispressed down; the cylinder is pushed and tne moves down the outside of thepistor:t (This is equivalent to pushing the piston into the cylinder). This causes

air to be forced along the connecting tube to the tyre .

: P . i - ~ t i f t ~ ' - ~ , ' ! ' I " " ' . - - ~ - t . ....*-.:--;-

(a) If the area of the piston is 25 cm2 and the force -applied to the cylinder is ' [",

800 N. calculate the pressure exerted on" the air by-the -piston

(b) Why is it important that the area of the piston (and cylinder) is not t o ~ · [2large?

(c) Describe the main energy changes that take place in the use of this [2pump'as the foot depress the pedal..





4 The diagram below illustrates the idea of pressure due to a gas .

.... .wallOf ccntaIr1er

(a) Explain h k i n ~ t i c t.heory of matte"tod Newton's ideas on forces'are [2]used to d e f i n ~ g a s ~ L ' Ii Lll. : . , _

(b) Jacques Charles (see him-, berow) investigated the relationShip [3]

~ e e n the volume of a gas and how it changed with temperature. Henoted that the volume of a gas Increased with the temperature .

. Charles then stated that the volume of a given amount of dry ideal gas. is _ .irectry p ' r o p o r t i g ~ ~ I . to the. ~ e t v i n T ~ m p e r a t u r e ~ c a l e . provided the

· amount of ~ n d the pressure remain f ~ ~ d .

Exp'ain how Charles's .statement and Newton'sLaws are applied to lift hot air balloon -throughthe air .





5. (a) The table shows three methods of heat transfer that is allowed through [2]

the different media. Complete the table to show the method of heat flowthat is allowed through the-different media. Show whether he-at flow ispossible or not by drawing a -tick (possible) or a .cross (not p o s s j b l e ) ~

. -

Medium Conduction Convection Rad1ation

Solid

Uquid .

Gas,'.

Vacuum. '

. (b) iLRadiatian is the transfer o f heat energy by e1e.ctromagnetic wave [3]

motion."How does the above statement explain global wanning on Earth?

6 (a) Several devices have been designed to harness energy from the waves .

. The 'Salter Duck' is an example. The duck Ibobs· up and down onwaves arid a special- turbine - inside converts this movement intoelectricity. The Salter Duck is as large as a Douple Decker bus.. They

are arranged in set patterns in the sea. to take advantage of waveformations.

Rockingmovement

Oncoming waves

axle .





If you watched a duck in o p e ~ a t i o n , how could you ten that it was good at [2]

! 3 x t r ~ c t i n g energy f r ~ ! ! l t h ~ waves?

(b) A range of hills Jies: between_ a radio and television transmitting station (3] -and .a house . The house lies well within the normal reception range- of

both t ~ e -r C J d i ~ al1d, television transmissions from _his station. Bcp',ain - .why a -television set in the house cannot receive -television transmissionsfrom the station while a radio set can obtain good reception .

7 Read the following passage carefully before answering the questions.

Spraying crops with chemical fertilise(S or i n s ~ c ~ c i d e s has b e ~ o m e more efficient .

-A portable h i g ~ v o l t a g ~ generator. gives the drops of liquid insecticide a small

positive charge.. This causes the liquid to break up into smaller droplets. This-helps the spray_ to become finer and spread out more.

The plants. which are all r ~ a s o n a b l e :conductorst are in contact with the earth. As

the droplets of spray get near to the plants, the plants themselves become slightlycharged and attract the droplets.. 1:'

(iI) ~ ~ a i n why the droplets spread"out. [2] .-.. A'" ..

(b) Explain why the drop1ets are attracted to the plants. [2]

(e) ~ u g g e s t now It IS -an -advantage to both tile tanner and the environment 12]to use very small charged droplets during the insecticide spraying.





8 (a) The figure below shows a circuit containIng A and B which are , I ~ n g t h s

(i)

(iQ

(b)

of different resistance wire while P and Q are two identical resistors. The

material ofwire A has a resistivity of 4.0 x 10-7' Qm and the diameter of

A is 1.6 times' that of B. In order for the galvanometer to show zero

. deflection. the length ofA is three'times that ofB:

A x

Q

Y .

What is the resistivity of the material ofwire B?- - -

Modify the circuit to achieve a. ful( wave· rectification when the power

supply is changed to a.c.supply..· .

Draw the modified circuit diagram and- sketch the"waveform of the ,full

wave r e c t i f i ~ t i o n ..[21





Modified circuit diagram:

Sketch:

(c) The figure below' shows the Centre Tap Fun-Wave Rectifier which isanother circuit arrangement to achieve a full wave rectification,.

Source: http://sub,,al1aboUtcircuits.comJimagesI03260.png

State one advantage that the modified circuit in (b)(i) has' over the circuit [1]

above, which js the Centre Tap Full-Wave Rectifier.





9 "'Cafs eyes" are prisms set in rubber mould mounted in a boX. They are usedon roads to mark out ranes by reflecting light from the headlamps at night (seeFig.9.1).

- ; ....

-..,.I:-=- ..:. ..- . . -,-. "":.. -

.. - .....

... -,. ..._ .....

--! .. _."

Figure 9.1

(a) . Complete the path of light rays in Figure 9:.2 below.

-pri$in -

.arr

-B

Light from

headlamps

Reflect!!dlight -

Figure-9.2

[ ~ J

(b) Given thatthe

refracflVe indexof

the materialof

the prism is 2.2, [2Jcalculate the critical angle of the material.





(c) A car is at a distance away from the reflector so that the light fram its [3]

headtamps makes an angle of incidence i =150

• Explain whether light isreflected to the car. .

Section B

Answer all the questions ffOm this section4

Question 12 has a choice of parts to answer.

10 (a) Maria, a geophysicist, searches for oil by setting off an expJosion [4)charge. It takes 0.4s for her detector to.. receiva an echo from' a rockband in the Earth's crust (i) I f the speec;l, of the sound waves throughthe surface layer is 4000 m J s ~ how deep is the top of the rock hand? -(ii)

·IfA second reflected pulse is p i c k e d ~ up 0.1 slater stin., ,\Nhere has ,this

come from? How thick is the rock band?

(b) Alfred, a sound engineer, used a noise Jeve) meter to measure thenoise levelfrom a pneumatic'drift He recorded the resutts\..as follows:

, " <..y .....--'4 c_ .. t' ) - • : ",...- " ... ." -"".

.,

Distance from drilUm 5..

10 20 40' 80

Noise leveVdB 90 70 50 30 10





Paul, Alfred's cousin, .commented that a noise level of BOd B and above would be - [6]

detrimental to human1

s hearing. Using the results from the table, estimate the

minimum ·safeJ

distance from the drill. Explain why the method -you used to arrive at

an estimation that is scientifically reasonable.. / .

11 (a) Alvin sets up an experiment to. ca-Iculate the specific latent heat of [6]

fusion of ice. It -was observed that beaker B was needed in the-experiment

Lab pack

t2 V

JouJemt1er

Water Wat6r

: : - : - - : ; - - ~ ' l l - - - r e __t_e.:..ps taken to determine 1he specific latent heat of

xpla-in clearly the use· of beaker B in your





(b) Calculate the specific latent heat of fusion of ice from these [4]

results.

mass of water in beaker A =0.1 kg

mass of water in beaker B = .02 kgfinal reading on joulemeter :: 71500 Jinitial reading on joulemeter = 43 500 J

-1200 the lined p ~ g e at the end of this. Question Paper

EITHERA thin. horizontal steel wire is fixed at one end, A and is kept undertension by means of weight. W s u s ~ n d e d over a pulley. Magnets areplaced near to the centre Qf the horizontal section of the wire in orderproduce a magnetic field at right angles to the wire as shown in Fig.

12.1.Horizontal steel wire

" " - - - - - 'A \ ~ - s -----r

F--/__ N _ ~ - - r / ______

r1(J.12.1

A 5 V battery is connected to the wire betvveen A and the puUey sucht ~ a t current"flows from A to the pulley . The horizontal steel wire bendsas shown in Fig. 12.2 •.

l>-z

- f - L ~ _ N __ </

o..-. .-____

fig. 12.2 -





(a) (i) Explain the.obselVation. [2]

(il) (ii) 'J\Iith an observer positioned at Z, Copy Fig 1 2 ~ 1 and Fig 12.2 and [2]draw the magnetic field ~ t t e m s as seen from Z in (a) Fig_12.1 and (b)

Fig.12.2

[ ]Fig 12.1

(b) From a popular culture standpoint, the electric guitar is one of the most·. important inventions of the 20th century. The electric guitar looks like anormal guitar except that it has no hoJlow cavity to amplify sounds madeby the strings. Instead, it senses t ~ e vibrations in the steel s t ~ n g s usingelectric ·"pickups". Then the- "pickups" s e n ~ electrical signals which are

produced from the vibrations to the amplifiers and. speakers. The diagrambelow shows the schematic side view ofan electric guitar.

Steel guitar string

Coil - - - ' 1 - - - - ' - - -

To amplifier

- - - - . . ~ Permanent magnet





(i) State the principle used in the design of electric "pickups·. [1]

Oi) Explain how an electrical signal is produced from the vibration of the [4]string.

(iii) Suggest a way to increase the strength of the electrical signal produced [1]wjthout change the strength of the permanent magnet

OR

. (a) .Diabetics 'have to be very careful about ,the amount they eat of 'certainkinds of food. Some use a simple balance at the table to check the

amounts they are about to eat. In one such balance, the pan· isconnected to a counterbalance by a scale, which is· calibrated to show

the weights directly. To use it. you',slide the scale through the pivot untiliJ balances then read the weight off the scale.

(i) . Explain how the balance works,. [2]

(ii) At which end of the scale (A or 8) are t h e J a r ~ e r weight ~ a d i n g s ? [2]- . .

(iii) T h ~ scale markings on a balance I;ke ~ i s are not equally spaced. Can [2]'

you explain why this is s01

(b) In a children's game, small balls are thrown at wood blocks in order to'turn . [11

them over .. One such block, of mass 150'9 with each side of length '10 em' isshown in Fig. I beJow . In order to tum the block over. the <;entre 01 gravitY C of

the block must be raised ·so that C is. vertically above the comer A For the

block as shown on Fig. 11, .





10cm... ..

-' "-

• ..

I..

'I> .. "10cm "':.....C,

...... ", I "

'A 'A

Fig. I Fig. II

(il) Calculate- the vertical height through which the centre of gravity hasbeen raised. .

(iii) Calculate the gravitational potential energy of the block.

(c) A ball of mass 11 ,g. traveling horizontally towards C. struck the block. The [3]

brock and' the ball are in contact for 0.15s. .and thereafter the block tums aboutc o m ~ r A to attain the posiOon in Fig. II. Given that 25% of the kinetic energyof the ball is t r a n s f e ~ e d to the block, calculate

OOU'b_.. - ------- C

A

(i) The .kinetic energy of the ball just before it strikes the block.

(ii) The speed with which the ball strikes the block .

(nil The speed with which the ball rebounds from block .

flV) The average forc.e on the block..





Section A

Q

Q10.

Qll.

Q12.

Q13.

Q14.

Q15.Q16.

Q17.

Q18.

Q19.

Q20.

Q21.

Q22.

Q23.

Q24.

Q25:

Q29.

Q30._ D

Q31. A

Q32. A

Q33. C

Q34. C

Q35 . C

Q36. No Answer

Q37. C

Maris Stella High SchoolPreliminaryExamination 2008

Secondary 4 Express

_Pure Physics

DD

5058





Section B

Ql

Q5a Ii Ii!Q5b Heat from the sun travels through space in the form of electromagnetic wave

motion. This heat is trapped within the earth s ozone layer and very little is_

released back into s p a c e ~ thus giving rise to global warming.





Q6a The cam-shaped Structure will be pushed along by the rocking movements of the

waves to tum the turbine whichin

tum will-extIact kinetic energy and- convert toelectricity

Q6b

Q7c. Also,

Q8ai

Q8aii

Q8b

Q8c Full wave rectification allows for both positive and negative portions of the wave

to be rectified, while half wave rectification oQly ' r e ~ e c t s ' the negative portion to

become positive as seen in the Centre Tap Full·Wave Rectifier.

_Q9a-

Q9b 27.0°





Bi Any movement of the steel strings will result in a change in magnetic flux. This

change will be amplified.

Bii Any movement of the steel strings will result in a change in magnet ic flux. This

change will be amplified. A larger movementViiU result in a greater change" thus

a different note.

Biii Increase the number ofcoils.

Q120R





Ai Using principle ofmoments -where clockwise moment of the counterbalance will

DPosed to the

Civ


2008 Maris Stella Sec4 Express

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