I [[IJJ - IGCSE Physics · PDF fileCandidates answer on the Question Paper. ... State what har ~ ) the mercury level in the tube . ... (i) (ii) (iii) (iv)

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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONSInternational General Certificate of Secondary Education

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Candidates answer on the Question Paper.

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READ THESE INSTRUCTIONS FIRST

Answer all questions.You may lose marks if you do not show your working or if you do not useappropriate units.Take the weight of 1kg to be 10 N (i.e. acceleration of free fall = 10 m/s2).

At the end of the examination, fasten all your work securely together.The number of marks is given in brackets [ 1 at the end of each question or partquestion.

This document consists of 16 printed pages.

~ UNIVERSITY of CAMBRIDGE~ International Examinations

0625/02Oetob 2008

1 hour 15 minutes

Write your Centre number, candidate number and name on all the work you hand in.Write in dark blue or black pen.You may use a soft pencil for any diagrams, graphs or rough working.Do not use staples, paper clips, highlighters, glue or correction fluid.DO NOT WRITE IN ANY BARCODES.

For Examiner's Use

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PHYSICS

Paper 2 Core

SP (NF/CGW) T41976/4© UCLES 2008 [Turn over

Hany El-Gezawy

2

1 A boy is fishing in a river. Nearby, a ferry-boat is taking passengers backwards and forwardsacross the river.

When he starts fishing one morning, the boy's wristwatch is as shown in Fig. 1.1.When he finishes his morning's fishing, the wristwatch is as shown in Fig. 1.2.

ForExaminer's

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(a) For how many minutes was the boy fishing?"~4~- S :2S-:3 \,r ~cl 20 ,rli", = '§D + 2..0

. " .number of minutes = Qo.o ml-(1 [3]

Fig. 1.1 Fig. 1.2

(b) It takes the ferry-boat 20 minutes to load up passengers, take them across the river,load up with passengers at the other side, and return, to start all over again.Calculate how many journeys, across the river and back, the ferry made whilst the boywas fishing.

2002D

number of journeys = 1..0 [2]

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[Total: 5]

Hany El-Gezawy

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2 The tank in Fig. 2.1 measures 2.0m x 1.5m x 1.0m. It is full of water.--water

Fig. 2.1

(a) Calculate the volume of the tank.

y=- L" 13 X H= 2 X t· S 'j( I

volume = 3 m~..........[3]

(b) Water has a density of 1000kg/m3.

Calculate the mass of water in the tank.

cr) {t ,mass = ~.Q.9..Q ~ [3]

[Total: 6]

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Hany El-Gezawy

4

3 A spring is hung from a beam, and a load is suspended from it.Fig. 3.1 shows the spring before and after suspending the load.

before after"--"--'-~""""'-''-'---- W - __ I~~-r'-"--'-'

L.....------ X ------ •......

Fig. 3.1

(a) Using the letters on Fig. 3.1, state which distance you would need to measure in orderto find the extension of the spring.s

distance = y...~ [1]

(b) An experimenter measures the extension of the spring with different loads, and obtainsthe graph shown in Fig. 3.2.

extension / cm

2\ol

oo 2 3 4 load/N 5

Fig. 3.2

(i) When the experimenter hangs an unknown load on the spring, the extensionof the spring is 1.7 em.Use Fig. 3.2 to find the weight of the unknown load.

weight = ~.~.~.S .( Lj·2 - ~·G

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N [1]

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Hany El-Gezawy

5

(ii) State the value of the tension in the spring when this load is hanging from it.

tension = ~.::.2.5 N [2]

(iii) The load is pulled down further.State what happens to the tension in the spring .

.......................................'IV\c.vea.se.$... [1]

(iv) After being pulled down, the load is released.State what happens to the load immediately after it is released .

.......................................G.oes U.p .

................................(. C..r<:..i..\.\.~\) [1]

[Total: 6]

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Hany El-Gezawy

6

4 Fig.4.1 represents the regions of the electromagnetic spectrum, with an enlargement of thevisible light part of the spectrum.

[2]

\.~-c':__-,-_~_~+-I~_r~"'T~--+r~n"'Tr~f-~:;__ V_iS_i_bl'T"e_-f-/_x-_raT"Y_S--l/,-Y_-_rays

I : IIY : / : II II <; I I

I

/ :/ ,,,,,,,,,,,,,,

ForExaminer's

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. CQ \!.. /.........,...."- ..A.. -- J. i; "'microwaves 0. \rt.,9 -rr ~."m .u.rl'.~Ol1t .._ ....;:x:;tA:..U"a~~l"'u-~ 1?t1~

infra-red o.ph~ ...£b&~/...T:.'t..f.'Un.ok.~f ..S~(..Ulr.~~.SJ5km~)...::tft~m.~ ~~;'"

y-rays S'te.ri. ~~.$.',.~..fooJ.j'" .d~tecl:t~. of:..ca.~.r 6...t~nf .[3]

-......-......lr---------------.,,,,,,,,,,,,,,,visible

Fig. 4.1

(a) Two of the regions have not been named in Fig. 4.1.In the two boxes below the spectrum, write the names of these regions.

(b) Write "long wavelength" next to the long wavelength end of the electromagneticspectrum. [1]

(c) State one use for the radiation of each of the following regions.

(d) State the colour you would expect to find

(i) at end M of the visible spectrum, ~.r;I. .(ii) at end N of the visible spectrum ViQ(e..t. .

[2]

[Total: 8]

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Hany El-Gezawy

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5 (a) Make the following scntcnces about sound echoes correct by crossing out the incorrectalternatives. An example has been given to help you.

(

large(example) An echo is caused when a sound wave hits a SfI'te+f obstacle.

thift

reflected(i) An echo is a sound wave which is ~if~88hH;l by an obstacle.

ifiiel5el ees

(ii) An echo from a stationary obstacle hasIi ~~88t8~f~8~el81Ie)tlolePlthe same frequcncy asa iY~8l1er fl equu ICY tllePl

the sound hitting the obstacle.

(b) Two students, A and B, are trying to use echoes to enable them to measure the speedof sound. Student f\ has two blocks of wood that make a loud sound when bangedtogether. Student B has a stopwatch. They stand 240m from the school wall, as showninFig.5.1. -

_____ -""""=-----"'''-='---- L......I _

_4--------------~(=24~O~m~)----------------.

Fig. 5.1

Student A bangs the blocks together and, at the same time, B starts the stopwatch.B stops the stopwatch when he hears the echo. The watch then reads 1.6s.

,:::if -f-orw.....J P ~(k IA'O....J i(i) How far did the sOl nd travel during the 1.6s? ~ Q m [1]

(ii) Calculate the spco' of sound.

speal.: ct'c;fc:adCL/ -t,m~= £tiO 11·6

speed of sound = 3..00 m/s [3]

t'1{1 ~ rtA~

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ForExaminer's

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[1]

[1]

Hany El-Gezawy

8

(iii) The students expected that the value for the speed of sound would be closer to330m/s.

Suggest two reasc e- that might explain why the students' value was different fromwhat was expectec.

1 m~os.(.ut.d...dA~$.+r..nC4:-: i().r.ot.Y'ect .2 YV\£aSUt'td t.ltnL in.correct [2]

("«ch'~~t;~)~r Any ~"(:~~ -f:;, ~ / Wirdl hUM.ot7 [Total: 8]

6 Fig. 6.1 shows two mercur- »arometers standing side by side. The right-hand diagram isincomplete. The space labc j X is a vacuum.

X

glass _--Itube

mercury

dish

Fig. 6.1

(a) On the left-hand barornr r, carefully mark the distance that would have to be measuredin order to find the value r the atmospheric pressure. [2]

(b) A small quantity of air i roduced into X.

(i) State what har ~ ) the mercury level in the tube .

............................... £o..'.l.S......................................................... [1]

(ii) In terms of the beh: our of the air molecules, explain your answer to (b)(i) .

...............a~:r. rnQk;ev.As bQm.bqr.d ScA~(Q.. ..~ ~

.................C'~tI2: p.(e.~.4~ o.n H9 [2]

(c) The space above thr- r1 ury in the right-hand barometer is a vacuum.On Fig. 6.1, mark tile I~ of the mercury surface in the tube. --

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[1]

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Hany El-Gezawy

9

(d) The left-hand tube now . > air above the mercury; the right-hand tube has a vacuum.Complete the table ~,CI using words chosen from the following list, to indicate theeffect of changing t'l ) c» nal conditions.

ris ~"

changeef

mer'

atmospheric pressurerises

-

temperaturerises

falls stays the same

7 This question requires the 1I ,e of a ruler or other straight edge. Fig. 7.1 shows a ray of lightstriking a plane mirror.

ray oflight

/

ct on the level of the effect on the level of the, y in th~ left-hand tube mercury in the right-hand tube

rises rises~CL([ s stays ~ 5am~

[Total: 10]

~orn"G1~

III.II1\.1 r~

Fig. 7.1

draw the normal to thc mirror at A,

draw the path ('f tr ~ r flected ray,

": "-.....................................................................L.....: .....v.:-............................................ [1]

[4]

(a) On Fig. 7.1,

(i)

(ii)

(iii)

(iv)

mark and labe

mark and labc

(' c of incidence, i,,. , ) of reflection, r.

ForExaminer's

Use

[1]

[1 ]

[1]

[1]

(b) State the equation that I;r -s i and r.

(c) OnFig.7.1

(i) draw another r .rr rthe right of A,

(ii) draw the path ( ('

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ich is perpendicular to the one in the diagram and 2cm to[1]

nf light after reflection from this second mirror. [1]

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[Total: 7][Turn over

Hany El-Gezawy

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8 (a) An iron rod is place, ~ xl t a bar magnet, as shown in Fig. 8.1.

[1]

IN sliron rod

ForExaminer's

Use

[1]

[1]

Fig. 8.1

(i) On Fig. 8.1, mark clearly the north pole and the south pole that are induced in theiron rod. [1]

(ii) What happens he r 'lgnet and the rod? Tick one box.

nothing D[ZJD

they attract

they repel

(b) A second bar maqn> is no v placed next to the iron rod, as shown in Fig. 8.2.

sl51'------ sl

iron rod

Fig. 8.2

(i) On Fig. 8.2, mark clearly the magnetic poles induced in the iron rod. [1]

(ii) What happens 10 the irC)nrod and the second magnet? Tick one box.

nothing Dhey attract [2Jthey repel D

(c) The iron rod is rem ved, leaving the two magnets, as shown in Fig. 8.3.

sl51-----

Fig. 8.3

What happens to the wo magnets? Tick one box.

nothing D•hey attract

~they repel D

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Hany El-Gezawy

(d) The second magncFig. 8.4.

I_N s]

11

removed and replaced by a charged plastic rod, as shown in

Fig. 8.4

1+charged

plastic rod

What happens to tt-", 'W'nC" and the plastic rod? Tick one box.

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nothing

they attract

they repel

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[aDD

-I

[Total: 6]

[Turn over

[1]

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Hany El-Gezawy

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9 A toymaker wires a circuit a toy house, so that a 6V lamp can be switched on using eitherswitch 1 at the bottom of t ) stairs or switch 2 at the top of the stairs.The circuit is shown in Fig J.1.

ForExaminer's

Use

x y

switch 2a

6Vlamp

b

6V supply

switch 1

Fig. 9.1

(a) When switch 1 is in position A, what is the position of switch 2 so that the lamp is lit?

..............................0 [1]

(b) When switch 2 is in p .cn b, what is the position of switch 1 so that the lamp is lit?

......................................................................E [1]

(c) The lamp has a resistance of 4.0Q.

Calculate the currcn i'" If r; circuit.

I: VIR=- 6/4

current = .'~/5 A [4]

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13

(d) The toymaker decid= wants to have two 6V lamps in the circuit with the 6V supply.

Which of the followir "leans of connecting the lamps between X and Y, shown inFig. 9.2, is the best? ( vt: two reasons for your answer.

X y

11-X Y

conr '1 1 connection 2

ForExaminer's

Use

Fig. 9.2

Which is best? .. Co.l\ne..c.+i.on 2 .Reason 1 bo1Y( ~ece.i.v.e +ttJJ Vol+ar ..(.&U ..kr,~StN.{sJReason 2 .I~~ O(\Q. b.(o.WS./S.w..;t.cbeJ ..off../ O~ [3]

w ,I\ Coo+it1.Ut!.. LVOdc ....:~~ [Total: 9]

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Hany El-Gezawy

10 The circuit in Fig. 10.1 sheon and off. The relay coil t

6V

r1~1~SWitCh) I+-

~

(a) The relay operatesOn Fig. 10.1, mark t'operates.

(b) Describe how the rei

14

n electromagnetic relay being used to switch an electric motormuch greater resistance than the potential divider.

pivoted ironarmature power supply

for motor,----{) '"'-.J 0-------,

relay core contacts

Fig. 10.1

there is a potential difference of 3 V across the coil.osition of the slider of the potential divider when the relay just

[1]

ises the contacts in the motor circuit.

.............wh.c.~ w\I're.nt si!J.d t~f(o.w ..~ CD.it .

..........th~ core (.i~Otl)·..~3N.+t5.ed tkt.t1 ~ .

..............Qy..m.~c.t.e attr~cte.4 ®.~.~ w.. p.;~.t. .

...............G..v:.mcd-u tt -pu.!~t Co"+QcJS CJOLLJ ............................................................................................ [3]

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[Total: 4]

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Hany El-Gezawy

11 Fig. 11.1 shows a transfo

0 ~

240V Imains i0 .:8000 turn.

(a) What name is given t

(b) For the transformermatter?

(c) Using the information

(d) State why it would no

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15

)cing used to operate a 6V lamp from a 240V mains supply.

B

ForExaminer's

Use

A

6Vlamp

iron

Fig. 11.1

piece of iron that links the two coils?

................COA.E [1]

'crate, must the mains supply be a.c., d.c., or doesn't it

..................a.~..c; [1]

ig. 11.1, calculate the number of turns on the secondary coil.

Vp _ NpVc; Nr2J.tO !oo0:=t> ~ s _ 8000 X b6 N"!» 2.~o

number of turns = 200 [3]

/ise to connect a 1.5V lamp between A and B.

..............~I+-.~ ico...h.~.f, [1]

.lLamp wi" b(aw J [Total: 6]

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Hany El-Gezawy

12 The nucleus of one of the (the symbol

21884

(a) State the proton nurr

(b) State the nucleon nu,

(c) The nucleus decays a

21881

(i) State the protor

(ii) State the nuclco

(iii) Name the ernit'c-

Permission to reproduce items where thirdreasonable effort has been made by the publpublisher will be pleased to make amends at I

University of Cambridge International ExamirCambridge Local Examinations Syndicate (UC

© UCLES 2008

16

rent nuclides of polonium can be represented by

f this nuclide. ......itl:1 [1]

. 2.l.g [1]of t'iis nuclide.

ir J to the following equation.

-) 2~ipb + emitted particle

er of the emitted particle. ..........2. [1]

'b r- of the emitted particle. . ~ [1]

'cle. ick one box.

a-particle [6'~-particle D

neutron Dproton D

[Total: 5]

j mal .al protected by copyright is included has been sought and cleared where possible. EveryES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, thepossible opportunity.

»art of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University ofch is itself a department of the University of Cambridge.

0625/02/0/N/08

[1]

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Hany El-Gezawy