I*,'- ~

CANDIDATENAME

CENTRENUMBER

UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONSInternational General Certificate of Secondary Education

I'-----__ f-i_tl~_t!_' A_~ I

ITIJJJ CANDIDATE [[IIJNUMBER

PHYSICS

Paper 2 Core

0625/22

,May/June 2010

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 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.

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

This document consists of 21 printed pages and 3 blank pages.

~ UNIVERSITY of CAMBRIDGE~ International Examinations

DCA (SHW 00379 1/09) 20865/5© UCLES 2010 [Turn over

Hany El-Gezawy

2

1 Five identical steel balls are measured with a rule graduated in cm, as shown in Fig. 1.1.I

woodenblock

2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Fig. 1.1

(a) Use Fig. 1.1 to find the diameter of one ball.

wl-"o( e, t.".,..~1k ~, 6 - L, =- I 2..

'D1Qrfttt:te~1Dnt "all:::. ';. ::; 2.lt

diameter of ball = ~.~~ cm [2]

(b) What instrument would be used to measure the mass of a ball?==-...............................................~ ..Ia"CL [1]

(c) Another ball has a volume of 9.0cm3 and a mass of 72g.

Calculate the density of this ball.

ForExaminer's

Use

=

density = ~ 3/~.~ [4]

[Total: 7]

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3

(a) Fig. 2.1 shows a space probe, far out into space, where there is no atmosphere. It ismoving at a constant speed in the direction shown by the atrow.

rocket motors

Fig. 2.1

Is a force necessary to keep the probe moving like this? Tick one box.

yes Dno I V--J

If your answer is "yes", draw an arrow on the diagram to show this force.

(b) Fig. 2.2 shows the space probe just after the rocket motors are fired.

exhaust gases

Fig. 2.2

State what effect this has on the space probe .

................................t!!f<~!~~.~ ~:t. .

...............................in...$0m-e.: .cf,rechbn ..(C(f."S.if.~..ds- ~...............[2]

e9(fausf !)Qselj

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[1]

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(c) Later into its mission, the space probe is brought back into the Earth's atmosphereagain, with no rockets working. f

Suggest two effects that the atmosphere has on the space probe.

1 SCOWS i.f. do.wn .2 m.a.Kt.$ .i.t. ~.Q1. [2]

CaMUt fy,.oh'of1br[Total: 5]

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Hany El-Gezawy

5

3 (a) Here is a list of some energy resources which might be used to generate electricity.I

Put a tick in the box alongside any of these which relies on a fuel being consumed.

oil~

hydroelectricity Dnuclear fission [rJwind Dwaves D [2]

(b) Here is a list of devices which convert energy from one form to another.

battery, electric motor, gas lamp, gas fire, generator, loudspeaker, microphone

Which of these is designed to convert

(i) chemical energy into light energy,

.............................................Jas. R.amp .(Or. ..tt~) .(ii) electrical energy into mechanical energy,

...............~J~.~tr.~~~m.otQr: .(.Qv.: .c.~d.5pelA~~C.). .(iii) sound energy into electrical energy?

.......................m} ~.'f:Y?ph.o.nL .[3]

[Total: 5]

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6

4 (a) Fig. 4.1 shows end views of the walls built by two bricklayers.I

A B

reinforcedconcrete

foundation

reinforcedconcrete

foundation

Fig. 4.1

Which wall is the least likely to sink into the soil, and why?

................................WQ,I.( A .

...................b1.~9~.r.ar.t.~ .

...................................~..s:.e.S .

............................................Lo.w p~«~ O\1 S.0.i.1 [2]

(b) Fig. 4.2 shows two horizontal squares P and Q.

P

Fig. 4.2

ForExaminer's

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The atmosphere is pressing down on both P and Q. !(i) Name two quantities that would need to be known in order to calculate the

atmospheric pressure on square P.

1 d.ep~ .(..~1at ..~..OU·r.) .

2 clet1:!J ~f. OJ.'Y.:- [2]

O~ acce!e~t~~JOlu.t to ~rovi,© UCLES 2010

Hany El-Gezawy

7

(ii) The area of P is four times that of Q.

Complete the following sentences.

1. The atmospheric pressure on P is ~me ~ the

atmospheric pressure on Q.

2. The force of the atmosphere on P is ...4.tm,tj ...j~4tey. ~~force of the atmosphere. on Q.

© UCLES 2010 0625/22/M/J/10

[Total: 7]

[3]

ForExaminer's

Use

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Hany El-Gezawy

8

5 Fig. 5.1 shows a device called a thermostat, which is being us d to control the temperatureof.the air in a room.

powersupply 0----,

insulator ----1

xy

temperaturecontrol screw--.,..-y~Yr--\\

brass strip contacts

Fig. 5.1

X and Yare strips of two different metals, joined together along their length. Together theyare called a bimetallic strip. X expands more than Y for the same temperature rise.

(a) The temperature rises and the bimetallic strip bends.

State

(i) which way the bimetallic strip bends,

.................................00.Q.~.$. t;, tht. r1J.ht. [1]

(ii) what happens to the contacts,

.........................................~ QP.~.n [1]

(iii) what happens to the current in the circuit,

..........................th~ CU.r.rent-.. w,lI·:~ 5T.o.P.._ [1]

(iv) what adjustment could be made to this thermostat, in order to increase thetemperature at which the thermostat operates .

....................................5£.r.e ..w. i~ .cotl1ro1. ..S.Crew .

.................................((o.±aJi $.~.~w c.l.o.c~.w.is~) [1]

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9

(b) Fig. 5.2 shows how the temperature of the water in a tank would rise if it were heatedcontinuously, starting with water at a temperature of 00C. I

70

temperature/ 0C 60

50

40

30

10

o o 40 50 602010 30time / minutes

Fig. 5.2

The thermostat controlling the temperature of the water switches off the heater currentwhen the temperature rises above 50°C.

(i) Use Fig. 5.2 to determine how long the water is heated before the thermostatoperates.

time = 2.9 minutes [1]

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70

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(ii) The heater supplies energy at the rate of 2000W.

Calculate how much thermal energy is supplied to the water before the thermostatswitches off the heater.

= ?O~ )(-t\rM

.:. 2-000 X(2.q min)= .2000 X 2q )('0

,energy = 3~.~.Rx....I.O J [3]

[Total: 8]

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Hany El-Gezawy

11

6 (a) Fig. 6.1 illustrates a sound wave travelling through the air.:.-.~direction of--~-4~~+-4-~--~~----+-----~--~--+-+-~~-4--~wave travel

( )

Fig. 6.1

(i) On Fig. 6.1, mark clearly the direction in which the air particles are moving. [1]

(ii) Use Fig. 6.1 to measure the wavelength of the sound wave.

wavelength = 4.~I!.t!.s..P~.!At.~P.J..... cm [1]

(iii) The Ritch of the sound wave is raised.

State how the sound wave pattern would differ from that shown in Fig. 6.1 .

.............S.h.o.r~r..~ve.~ .;.~ m.o~ ..WaN.e.r iIII .

..............flu.J~m!..~·S.lrlll(t. (mD.d. &<fWN.:J)........................ [1]

(b) Fig. 6.2 shows a section through a series of waves on water.

t•~

direction of~

wave travel

Fig. 6.2

(i) On Fig. 6.2, mark clearly the direction in which the water molecules are moving. [1]

(ii) From Fig. 6.2, measure the wavelength of the water wave.

wavelength = .J.~.pe.wk...O/l.W:..tcrt ... cm [1]

(iii) The ~~de of the water waves is increased.

State how the appearance of the water waves would differ from that shown inFig. 6.2 .

................ta.l(~r...w.t:A.~!...w..t.ll. .appetr. .

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

[Total: 6]

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7 (a) A ray of light passes through one surface of a glass prism at right angles to the surface,as shown in Fig. 7.1.

ForExaminer's

Use

ray oflight

Fig. 7.1

(i) State why the ray is not deviated as it passes through the surface into the glassat A.

.......................hib. S.u.rI.aCL ..qf r:j8~.t.a(J9.lS .

........................(.a.r19ft ".l..I;,Cid~fi~ = Zero) [1]

(ii) On Fig. 7.1, use a ruler to help you draw the rest of the path of the ray, until it hasemerged again into the air. [3]

(b) Fig. 7.2 shows a periscope that uses two plane mirrors.

mirror A

mirror B

Fig. 7.2

(i) On Fig. 7.2, clearly mark the angle of incidence i and the angle of reflection ratmirror A. [1]

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(ii) State the equation linking i and r.r-..\.

r-..,.--(iii) In the space below, use a ruler to redraw the periscope, but using prisms like that in

Fig. 7.1 instead of mirrors at A and B.

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[Total: 8]

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[1]

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[2]

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8 (a) Fig. 8.1 shows a circuit containing a 6V lamp, two switches and a 6V motorcycle battery.The lamp has a resistance of 10 n when it is glowing normally.

ForExaminer's

Use

6V

~~------,

-rIII

6V,10n

Fig. 8.1

How can the lamp be made to light up at normal brightness? Tick the box alongside anyaction which will do this.

close S1 only Dclose S2 only Dclose both S1 and S2 0 [1]

(b) Fig. 8.2 shows a similar circuit, but the switches are arranged in parallel.

6V

-=-rIII

.~ ~1~7_6V,10n

Fig. 8.2

How can the lamp be made to light up at normal brightness? Tick the box alongside anyaction which will do this.

close S1 only 0close S2 only [2Jclose both S1 and S2 0 [2]

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(c) The lamp is now connected to a 1.2V car battery, as shown in Fig. 8.3.

~-----,

12V-r

III

6V,10Q

.....................................lA.mp. W.o. (,t, ,.r) ~. to.w. .

..................................( ±OQ..muci« Vb..{ta.r.ICu.~). [1]

(d) Resistor R is connected in series with the lamp, as shown in Fig. 8.4.

Fig. 8.3

State why it would not be wise to close switch S.

S

ForExaminer's

Use

6V,10Q

(i) State what value R must have, in order to enable the lamp to have 6V across itwhen S is closed.

resistance = 1.0 Q [1]

(ii) With this resistor and the lamp in series, calculate the current in the circuit.

current = O..b A [4]

[Total: 9][Turn over

12V-r

III

Fig. 8.4

I: viR: 6/10 - 0.6-

or r = viR..= \2./.2.0 - 0.6-

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9 Fill in the gaps in the sentences below, using only appropriate words from the following list.Do not use any word more than once.

charge, current, few, many, potential difference, resistance

Insulators are materials which possess very fe.w free electrons.

Because of this, when a 00 Oo,?otcnhal. cliff! 00 00 00 is applied across an

insulator, the electric w.~.~t in it is very small.

The 00 00 .~s..i. S.tanCL 00 00 00 00 of a piece of insulator is likely to be very high.

[Total: 3]

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[3]

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10 (a) (i) What is an electromagner?

............................Ii.m"Jl1Ill:.wlMch ..oppeYQ/e~ w.h.t,n .

...................~ ;S a. ..4~1: .

...... ·C··.CDil ~.~ .f)..WrsrJ.: ..Wrr:.pfUl·.~onJhn [1]~r)

(ii) State one very useful property of an electromagnet.

........................................Ca.n be Swit.d.r~.don/.o.ff .

........................................ ~.h ~ h?Qrb. IIe!rJ..S.~ [1]

(b) An iron bar has many turns of wire wrapped around it, as shown in Fig. 10.1. The wire isconnected to an alternating current supply.

low voltagelamp

iron bar

ForExaminer's

Use

'"'"-alternating

currentsupply

Explain why this happens .

............... .In.(; M~.rJJJC..£~drl.pYlfKip.(Ld. /.w.I.11. .

..........................,.ha'!#l ,~~& fllAx .t·".lcar- .

................(..-h~~111 Li ~es ~i?J"'M.) .

...............................sa irJdM.a.J. e.·.m.!.t:. w.tlf. Iu .

............................pro.ciMc.uJ ....in t:h.t ..OrFik. ...c.c'r.CtMt ..(fa.p.(/y~1)© UCLES 2010 0625/22/M/J/10 [Turn over

Fig. 10.1

Some more wire is made into a flat coil and connected across a low voltage lamp. Whenthe flat coil is held close to the end of the iron bar, the lamp glows.

Hany El-Gezawy

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(c) Fig. 10.2 shows a relay being used to switch an electric motor M on and off.

springy metal

pivot

contactsA _----'r' --1~B=" \ ~ I

insulatoriron armature

core

coil ofwire

S

Fig. 10.2

Switch S is closed. State what happens to

(i) the core,

.............................................Ma9Ni,.t.~d ......................

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

(ii) the iron armature,

.................................................a:ltrrJ.c.~d .

................................. (m4!.nJ;'s,gJ)..... [1]

(iii) the contacts A and B.

.........................................................c.lo.s.e... .

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

(d) A suggestion is made that the relay would work better if the armature were made ofsteel instead of iron ..••.... -Explain why this is not a good idea .

...............o...r:.((1.J..~~ 4;re.C()"".t..~ .pt!r.m.tJAe~ m'ttdtZPJ. .

................~.9~.fdn~t.r."!;I.~ ..:6bm (Q~/ ..C4lltQ'tJ Q.lW!}.,s...C(05Id[2]

[Total: 10]

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11 (a) State what is meant by thermionic emission.

..........................e.mis..t,: ;:>.0 of e.,e.clr.oO'$. ~ .

..................................................~~i~ [2]

(b) In Fig. 11.1, a beam of cathode rays is entering the space between two charged metalplates.

cathoderays ---»---- ----::-:~

Fig. 11.1

(i) What sort of particles make up cathode rays? Tick one box.

a-particles Delectrons [aneutrons Dprotons D [1]

(ii) On Fig. 11.1, continue the dotted line to show the path of the cathode rays as theytravel between the plates and into the space beyond the plates. [3]

[Total: 6]

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2012 (a) Four students attempt to define the half-life of a sample of radioactive substance.

Student A Half-life is half the time for the activity of the sample to decrease to zero.

Student B Half-life is half the time taken for the activity of the sample to decrease tohalf its original value.

Student C Half-life is the time taken for the activity of the sample to decrease to halfits original value.

Which student has given a correct definition? C [1]

(b) Fig. 12.1 shows two samples of the same radioactive substance. The substance emits~-particles.

[1]

I I

ForExaminer's

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. Fig. 12.1

Put a tick alongside any of the following quantities which is the same for both samples.

the half-life of the samples [aDDD

the mass of the samples

the number of atoms decaying each second

the number of ~-particles emitted per second

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Hany El-Gezawy

(iii) The material is only useful to the factory if the activity is at least 100 counts/minute.Use Fig. 12.2 to determine how many hours of useful life the factory has from theradioactive material. hTo evct d-\?-

-r'nL eo.!.t hDtf+ u~k,S~~ N 13 C Witt\" 200 Imi",)

21

(c) A quantity of radioactive material has to be taken from a nuclear reactor to a factorysome distance away. Fig. 12.2 shows the decay curve for the quantity of radioactivematerial.

count ratecounts / minute

1000

2 4 6 8 10 12 14 16time/hours

Fig. 12.2

Just before it leaves the nuclear reactor, the count-rate from the material is 2000counts/minute. When it arrives at the factory, the count-rate is 1000 counts/minute.

(i) How long did the journey take? 4 hours [1]

(ii) How many half-lives elapsed during the journey? /.......................... [1]

useful life = .13 hours [2]

[Total: 6]

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