UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONSInternational General Certificate of Secondary Education

CANDIDATENAME '----- __ M_Q_cLM_AYu_svJef 1

OIIJCENTRENUMBER

CANDIDATENUMBER

•

PHYSICS

Paper 3 Extended

0625/33October/November 2013

1 hour 15 minutes

Candidates answer on the Question Paper.

No Additional Materials are required.

READ THESE INSTRUCTIONS FIRST

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 pencil for any diagrams or graphs.Do not use staples, paper clips, highlighters, glue or correction fluid.DO NOT WRITE IN ANY BARCODES.

Answer all questions.Electronic calculators may be used.You may lose marks if you do not show your working or If you do not use appropriate units.Take the weight of 1kg to be 10 N (i.e. acceleration offree fall = 10 rn/s'').

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 part question.

DC (SLM/JG) 64758/5© UCLES 2013

This document consists of 18 printed pages and 2 blank pages.

ID UNIVERSITY of CAMBRIDGE• International Examinations [Turn over

Hany El-Gezawy

2

1 An archaeologist digging at an ancient site discovers a spoon. The spoon is made from anunidentified material.

(a) The archaeologist suspects that the spoon is made of metal. She places it above aflame, as shown in Fig. 1.1.

Fig. 1.1

(i) She notices that the handle of the spoon quickly becomes very hot.

State why this observation supports the suggestion that the spoon is made ofmetal.

................13.e.cau.sz. t1dw\.s q.'f.~ 8Qod Co..ndud.br.~ .

...........................................Qf. h·e~ [1]

(ii) Describe, in terms of its atoms, how thermal energy is transferred through a metal.

........qT..fu h0t.£ncl m.0.leCu..&S v.\h~ .

.........:fuw. m.Q(e.~~ C.dttc0. ..w.\~ ~y. .

............ 1(,1ci'j h.bo.ucs..~ ..5.Q eYJ.ef8j t.br.R.~.h. v;. b.cdl'9.n .

........... pA.S'S.e.a 9D .

.............................................................................................................................. [3]

Or-G(~~YH (fvy.~)roesve. rfb stu- ~ot v:bV'~-fu s-b--- cd- £ hot00 OMct, fu! e. eledrov

pa ~s O~ ~ $Q 11- ~a, fur fucA,.

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Hany El-Gezawy

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(b) The archaeologist hopes that, by determining its density, she will be able to identify themetal.

Describe a method for determining the density of the metal from which the spoon ismade .

..................................lli-~~ ~..mas.s ..I\f9.lUmR. .

...0 .D~~ ~ mass. ..d s.p.O.~n. bJ \jS.lIf.l3···· .

...........i:Qf?~f.X!'\.\..b.ala.(\.Oh·:;f·····i.'m~v.:-~ S:p.~r.) :1~ .

.............a.. ..~qs.u..O'~ ~ll~v:1ckc w;1h q ..~.v..{w.rct:e.'t'\.1 .

. .\!910.~ ..~.w-~. J detetr.mj.~ :fR...JVo1Cf.'eaiR. .

............. j.v:\ \lbtJ.~.W~d. ..W;.!( b.e. ..~.~L).m.Q...z:f.S~D9.f;) .

G······..s:ubs:h:k U0:~ f.YlQJ:S ~ Vbl£)~ ~ ..s.~~ [4]

\~ ~ a.bo~ ~~~'o0 . [Total: 8]

© UCLES 2013 0625/33/0/N/13 [Turn over

ForExaminer's

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Hany El-Gezawy

4

2 A spring S is suspended from a clamp stand in a school laboratory. ForExaminer's

UseA student hangs various masses from the end of S and determines the extension x producedby each mass.

~ 250j(a) Calculate the weight of a 250g mass. \00:::> ....::: 0, 25 ~

~6M- =-- rY):3~O\2sxIO

weight = ?~.';? N [2]

(b) The student plots a graph of the force F applied to the spring against the extension x.Fig. 2.1 is the student's graph.

6.0

5.0F/N p

J~4.0

3.0

2.0

1.0

oo 2 4 6 8 10 12

-4!F- lO -- > x/cm

Fig. 2.1

At point P on the graph, the line begins to curve.

(i) State the name given to point P.

...... .hrr.;l:: o.#..~m.p ot.hnro ·~tJ ·

....................................().r. ela.s:\t~..Q;m.'it [1]

(ii) Use the section of the graph where spring S obeys Hooke's law (F = kx) todetermine the spring constant k of the spring.

=

k= O~.4.5. N/Cm [2]

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Hany El-Gezawy

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(c) Fig. 2.2 shows a mass of 0.12 kg resting on the bottom of a box.

box

Fig. 2.2

A spring that is identical to S connects the mass and one side of the box. Ignore frictionbetween the mass and the box.

(i) The box and the mass are at rest.

State the resultant force acting on the mass ..~

force = Zo:o N [1]

(ii) The box is firmly attached, in a horizontal position, to the body of a racing car.

As the car accelerates the spring stretches by 2.0cm.

1. Using Fig. 2.1, determine the tension in the spring.

US~ ~ caVfh (O,S> ~ LON)

tension = 00.!.9. N [1]

2. Calculate the acceleration of the mass produced by this tension.

~Z()\Q

~0..2:-rn

ForExaminer's

Use

© UCLES 2013 0625/33/0/N/13 [Turn over

acceleration = ~ •..? m./s..~ [2]

[Total: 9]

Hany El-Gezawy

6

3 Fig. 3.1 shows a fork-lift truck lifting a crate on to a high shelf in a warehouse.

crate

fork-lifttruck

Fig. 3.1

The fork-lift truck lifts a crate of weight 640 N through a vertical distance of 3.5 m in 4.0 s.

(a) Calculate the useful work done in lifting the crate.

W\YK-dD~ s;;. F K d=-- 6'~o '( 3,S

work done = 2.2.~.o. J [2]

(b) A motor drives a mechanism to lift the crate. The current in the motor is 25 A. The motoris connected to a 75 V battery.

Calculate

(i) the energy supplied to the motor in 4.0 s,

l= :::: V I -t.::::: -::f-S x. 2 S x l{

energy = 3.-.5..0.0..S [2]

(ii) the overall efficiency of the fork-lift truck in lifting the crate.

eAAue1lcr:= useM ~ o~ X l00 Y.-e-V\Q,f[Jj ~ut- .

'22~O::]-50~ffiCienCy = :E.l.!.CJ. % [2]

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Hany El-Gezawy

7

(c) Not all of the energy supplied is used usefully in lifting the crate.

Suggest two mechanisms by which energy is wasted.

1. . LJ.e.cM C£<f2 ..!tledl.(19 .2 :G::l..~. f() [2]

Sourd [Total: 8]

ForExaminer's

Use

e UCLES 2013 062S/33/0/N/13 [Turn over

Hany El-Gezawy

8

A child's toy launches a model parachutist of mass 0.40 kg vertically upwards. The modelparachutist reaches a maximum height of 8.5 m.

(a) Calculate

(i) the gravitational potential energy gained by the model parachutist,

8rcw~ ~+.& = m 9 h-= O.lt X \0 X 8,S

==- s Lt

energy = 3~ I. [2]

(ii) the minimum possible speed with which the model parachutist was launched.

c-P E-]y

V2. 2x:?40-4

V::zffio

k, I-=- =-1X'O,lfXv'2==-2

speed = J~ tD./s. [3]

(b) In practice, the launch speed must be greater than the value calculated in (a){ii).

Explain why.

...... ~e. ..f0....1:> a:a...G."r.(~y., ~ l.si.",a,)y. . .

...............(;..k~f..K.~ o.-r. ~ ~~.J .q.s ~ .

................Y:'n.o.u. K.~.P-. l.~ ~.l ..-io e~CJo:-Q jrj [2]

(c) As the model parachutist returns to the ground, it loses gravitational potential energy.

Explain what happens to this energy as the model parachutist falls through the air at~o_n~ta.I'ts~eec!:

........... :trof.).$.f.o:(tif.\ed ~ ..~~a.S2.~ ~.s:.t..:.k .

..........................~'c: ~.r.--n~.s [1]

V' 01 k'.F- [Total: 8]

Vl.o+ G-Pe. ---7 K. I~ -'::so ~1~cJ-

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Hany El-Gezawy

9

5 The Sun is a large sphere of high temperature gas. An extremely large quantity of energyradiates from the Sun into space every second.

(a) A process releases energy inside the Sun and its temperature stays high.

State the name of this process .

.........................nlJ..c.ka<.: ..M19.b ..r.e.ac;h\?D............................................... [1]

(b) A gardener stores water in a large, cylindrical metal drum. The drum is painted blackand has no lid. On a bright, sunny day, the water evaporates quickly and the water levelin the drum falls.

(i) Suggest how, by using a drum of a different shape, the gardener can reduce thequantity of water lost by evaporation .

..................i.t h.~.$. Sm.~lkKs..\)"y:tu.(Q o.tf:(fJ .

........................... ~r.1O''C.r.9.w.f3r.. a± ..io.p.~._ [1]

(ii) The gardener is told that, by painting the drum white, he can reduce the quantity ofradiation absorbed and so reduce the rate of evaporation.

Describe an experiment to show that black surfaces are better absorbers ofradiation than white surfaces. You may include a diagram .

........ ~ .... ~ €Jt<;f?,: .. .o.s....ohQ~ ..:;p- bta.0k. ..t.~.K ...Card-r..

..........$kck.. ±a ~.~:;I W\e..a.s.~..fk ..fav.rrp ..

..........O'~SL <7.h ~1f.\ ~~ ~ ~t.:~.CLir.d .

.......~¥J.1~~ ~s ~~ ..,oJ,e.,.j...$o b.t~c.k .

............3uc.fk0) D.'f!:.... ~ ..ab.~~.r..~cs [4]

[Total: 6]

ForExaminer's

Use

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Hany El-Gezawy

10

A student uses a 2400W electric kettle to obtain a value for the specific heat capacity ofsunflower oil.

Fig. 6.1 shows the apparatus.

thermometer

plug

ForExaminer's

Use

kettlemeasuringjug

Fig. 6.1

The student uses a measuring jug and pours 1.5 kg of sunflower oil into the empty kettle. Heuses a thermometer to measure the temperature of the oil.

The kettle is switched on and left on for 50 s. The temperature of the oil increases by 32 "C.

The student assumes that all the electrical energy is transferred as thermal energy to the oil.

(a) Calculate the value for the specific heat capacity of sunflower oil obtained by the student.

5\.'2>(10 J

c

2 '3 -/, 0

specific heat capacity = ..... :..~.5..X ...LD.....~/~ ...c.... [4]

(b) State and explain whether the value for the specific heat capacity obtained by thestudent is too large or too small.

.....:1k..:>.~tyQ,.tIiR.....h··~·£:t7····~.t'.L-····

.......~ ..t~ hed...LQ.~t...+.a ..Su.r.r..ou.nct.~s [1]

[Total: 5]© UCLES 2013 0625/33/0/N/13

Hany El-Gezawy

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7 A ray of light from a laser passes from air into a clear, semi-circular, plastic block. Fig. 7.1shows the ray entering the block.

ForExaminer's

Use

plastic blockI

: normalII

Fig. 7.1

The ray continues in the same direction and meets the middle of the opposite surface at anangle of 400 to the normal. The refractive index of the plastic is 1.5.

(a) The ray continues into the air.

Calculate the angle between the normal and the path taken by the light after it leavesthe block. b' ~ . r. O~Sih L -- '3jR-r o,:ltr

V'L.:2 1'.aS\\, , S1Yl all£..,r (J'()r -5il1 r: =- S"h L)(n- -

_ S~Vl '--to' x \5 'Z- C3\QGy \o

angle = ?.4.~.r;; [3]

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Hany El-Gezawy

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(b) The frequency of the light produced by this laser is 3.8 x 1014 Hz and its wavelength inthe plastic block is 5.3 x 10-7m (0.00053mm).

Calculate

(i) the speed of light in this ~astic,

V = fAx f \'-c-1 D= 5·3 X'lO ~ S, ~ X; \

2.014 y: (OS

(ii) the speed of light in air.

speed = ..... 2.~.Ol.k..x:.lQ.~...(bls.....[2]

~~\~u&~~ ~eV'e-

ForExaminer's

Use

© UCLES 2013 0625/33/0/N/13 [Turn over

YL= CV

C=n()(V 8t·S »: 2.0/4 )( (0

~speed = '"$.:9.?:- xio sols [2]

(c) Explain why the ray does not change direction as it enters the plastic block .

.........Wg~ ..~t:? .....~+...(£y:dY.:~J....~ ..{).ia$:h:<::.. qj...~ ..SaCM..

.........t\~ ...c.k ..1.h~..~~o.c:t..~.~).:;J.S~ QJ1. 5.lo.W..$ .

...........dO'w.'0. d.~.s.a.~ ..~ (...r...::: ..O~ C. L..:.::..0), [2]

[Total: 9]

Hany El-Gezawy

14

An a.c. power supply is connected in series with a metal-filament lamp. A cathode-rayoscilloscope (c.r.o.) is in parallel with the lamp, as shown in Fig. 8.1.

Fig. 8.2 is the trace seen on the c.r.o. screen.

'r /\ '\I 1\ I \ I \

II \ I \ I \ II \

\ \ I\ I

I 1\ 1\ IIIV V \

[2]

lamp cathode-rayoscilloscope.......-t-

ForExaminer's

Use

power ~supply

Fig. 8.1 Fig. 8.2

A diode is inserted in the circuit, as shown in Fig. 8.3.

'! I~ r\I ~ I 1\ / \

II \ II , I 1 /\ ~ , J J, , , ,,, , , , ,

, , ,, , ,, , ,, ,," , ,

, ' , , ,, ' , , , ,.: '-,

lamp cathode-rayoscilloscope.......-t-power ~

supply

Fig. 8.3 Fig. 8.4

(a) (i) On Fig. 8.4, draw the shape of the trace now seen on the screen.

(ii) Suggest a device that uses a diode in this way.

...........................Qe.difi.~r. ~..to..procL~...cl~(:'.-bO',c..."'[1]

(b) State and explain the effect on the lamp of inserting the diode into the circuit.

............~trp. &S.~~ OY.) ..g ..9..f.!.:.!h..st ..~:R ~~ .

. Lei;' brfJ h:!. (o!Jm.~ .

..............:f!.g2> :t!~:;/.5-f;) iess. pcw.ec ~J ~ [2]

~.. [Total: 5]

"

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Hany El-Gezawy

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9 The a.c. supply from a power station is connected to the primary coil of a transformer. Thesecondary coil is connected to long-distance transmission cables.

ForExaminer's

Use

© UCLES 2013 0625/33/0/N/13 [Turn over

(a) The output voltage of the transformer is greater than the input voltage.

Explain how a transformer produces this output voltage .

..........Q\hr.lO.t1~ ~.C~~.~atdJ~~ ..................M~J.~~ ..Wd ~at fu 1D),Y.)\o.~ ................5.() QM.0.ma:b~ m.(E1~~(.....£r:ddf.,~ s.e.c..:: Co..n .

................ Vb.lf-o..:'f-.3 .s ...;.ndill:a..J. ..I¥I .... 5.e.I2...'.~'L...~..... u

.................~cl k~.k $.e.CwX\~G'"J ..C0.I. R9 .

.................H.O.R.E-:.tv.(.()>. ...~f.l. ..pc~Yl1~ .....s.-o....~ ..o~pd [4]

(b) There are energy losses in the transmission cables.

(i) Explain why the energy losses become greater when the length of the transmissioncables is greater .

.....O'S' ~ \\c.~.~!. ~~.~s+uVl.(R. lho.r.eC(.~ .

...... ~ eY.l~ .l.~s.se.sd~ ..±o rr.~;5+u'l:\Ur ~ .

........C@.k? ~P.~I.~R.~ [2]

(ii) Discuss the.advantaqes and disadvantages of using transmission cables of greatercross-sectional area .

...~.....Q.5.:.....G:mr. ... s..e&.'O.~ ..9.:ft:Y.\ ... :.iY1.C!..rr..~S&!..-/ ... ('e~ Uh!R.

..........de.~Q:$.g5:····f·~·Q······(~·~fM.~.~J(..bd- ~~ .

... Y.\0L?l..N. m.~:-r..~..meh.Q. ..~.J h.~~ ~.~J. [2]

w~6h. ~~ G9S+~ Pjlon~ [Total: 8]

..

Hany El-Gezawy

16

10 Fig. 10.1 shows a variable resistor (rheostat) and a solenoid (long coil) connected to abattery.

variableresistor

solenoid

ForExaminer's

Use

battery-r-

II---l....-

Fig. 10.1

The current in the solenoid produces a magnetic field.

(a) (i) On Fig. 10.1, draw lines to show the pattern of the magnetic field due to the current.[2]

(ii) State the feature of the pattern of the magnetic field lines that indicates the strengthof the magnetic field at particular points .

...... .UY.l.~.s. Cl9.5.e.c ~.bB.'.~ !.~ .

S'tn~()r-...........................................................;..~.,..o' [1]

(b) ~ and explain the effect on the magnetic field of increasing the resistance of thevariable resistor .

...........s. ~U.5.. ~.S.~.~ d...~ ..£~ld .

...........e f.Y.1.c.~$.~ ~ ..~.[~-da~.~ k &...cka£:1at .

..........................~u.s. ~ ..Ct.t~m. .

..................................................................................................................................... [2]

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Hany El-Gezawy

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(c) In a laboratory vacuum chamber, some current-carrying coils produce a very strongmagnetic field near a source of a-particles.

•Fig. 10.2 shows the arrangement. Or

ForExaminer's

Use

x unifor_____ ma tic

~x f dintopage

x x

x x x x x x

path ofa-particles x x x x x

x x

Fig. 10.2

(i) In the shaded region of Fig. 10.2, draw a possible path for the a-particles in themagnetic field. [2]

(ii) State and explain the effect on this path of reversing the current in the coils .

................... .i..t. CY:.~~ ~ .Q~.~S~.-k Q.ir.e.CU~ .

.................. ~~ .

.....................~ ~~U~~.BbbI. is ce.V':£r.k.J. [2]

[Total: 9]

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Hany El-Gezawy

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11 In a laboratory at a nuclear power station, a radiation detector is connected to a computer.The readings recorded are displayed on the computer screen.

The detector is switched on. Ten minutes later, at time t = 10 minutes, a small sample ofradioactive material is removed from a nuclear reactor and placed near to the detector.Readings are recorded for a further 40 minutes. Fig. 11.1 shows the display.

90

80

count-rate 70counts/minute

60

50

40

30

20

10

00 10 20 30 40 50

ForExaminer's

Use

time t/minutes

Fig. 11.1

(a) Use Fig. 11.1 to determine the background count-rate in the laboratory.

background count-rate = ..1..2 G>.v.rrl:.s ..lm.tn .. [1]

(b) Use Fig. 11.1 to determine the count-rate due to the radioactive sample

(i) at t = 10 minutes,

count-rate due to sample = 1~ (Q.\.m.t.S"./rr.l.l~ .

(ii) at t = 19 minutes.

21- 12.-::: 9,

count-rate due to sample = ! ~9..~n~.lt!).(t\ .[2]

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Hany El-Gezawy

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(e) Use the values obtained in (b) to estimate the half-life of the radioactive sample.

'2 h,L. >- 3G h.L· ~ 1?1 h.L~ qT rn ® Q ~I

(LV Go vvffJ fI1~CVVII t-5o 111,'"

~ 10 -to ,q M~

half-life = '3.-:' ..Q m.~.n [2)

3 haJP- ~~s

£\.L. = CJ rrv~ = 33 h.l- [Total: 5)

- --- -----.

ForExaminer's

Use

Hany El-Gezawy