CANDIDATENAME

CENTRENUMBER

UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONSInternational General Certificate of Secondary Education

I ROrk/!?P.iJe~ In-TTTl CANDIDATE ITTII~ NUMBER ~

PHYSICS

Paper 2 Core

0625/23October/November 2012

1 hour 15 minutes

Candidates answer on the Question Paper.

No Additional Materials are required.

For Examiner's Use

1

2

3

4

5

6

7

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11

12

Total

READ THESE INSTRUCTIONS FIRST

Write your Centre number, candidate number and name on all the work youhand 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.You may lose marks if you do not show your working or if you do not useappropriate units.Take the weight of 1 kg to be 10N (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 Diven in ornckcts l 1 at the end of each question or partquestion.

DC (CW/SW) 49782/4© UCLES 2012

This document consists of 19 printed pages and 1 blank page.8 UNIVERSITY of CAMBRIDGE:: :::~.International Examinations [Turn over

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2

Two boys, X and Y, decide to measure the speed of some of the vehicles travelling along aroad. The two boys stand 405 m apart beside the road, as shown in Fig. 1.1.

Y X405m

ForExaminer's

Use

Fig. 1.1 (not to scale)

Boy X has a stopwatch which he sets to zero. As a vehicle passes boy Y, boy Y drops hishand as a signal to boy X to start his s opwatch. Boy X then stops the stopwatch as thevehicle goes past him.

The appearance of the stopwatch is then as shown in Fig. 1.2.

Fig. 1.2

(a) How long did it take for the vehicle to travel from Y to X?

time = 5..'t. s [1]

(b) Calculate the average speed of the vehicle as it travels from Y to X.

5pe~ = c/isrante / rime

== L,05 /54': -=l.. IS

average speed = 7f.~.5.. rnls [4]

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Tick one box.

greater than average speed I V'" Isame as average speed Dless than average speed D

[2]

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(c) The vehicle in (a) and (b) is accelerating as it travels from Y to X.

(i) How does its speed at X compare with that at Y?

Tick one box.

less than that at Y

[2]DD

greater than at Y

same as that at Y

(ii) How does its speed at X compare with the average speed calculated in (b)?

[Total: 7]

© UCLES 2012 0625/23/0/N/12 [Turn over

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4

2 Solids, liquids and gases have different properties. The list below gives some of them. ForExaminer's

Use

[2]

shape{

completely fills the container

fills the container from the bottom

fixed shape

{

move around, close together

molecules move around, far apart

vibrate about a fixed position

Use descriptions from the list to complete the table. Any description may be used more thanonce if appropriate. Two spaces have been filled in to help you.

shape molecules

(a) solid fi){ed .f'~eJ pos ;+ion.

(b) liquid +iI' t(O,a bt)itolll move around, close together

vnOw. Qrovnct J

(c) gas completely fills the container +Or opo(t

[Total: 4]

© UCLES 2012 0625/23/0/N/12

[1]

[1]Hany El-Gezaw

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3 Here is a list of energy resources available to the world. Some of these are renewable andsome are non-renewable.

[4]

In the first blank column, put a tick by any two resources that are renewable.

In the second blank column, put a tick by any two resources that are non-renewable.

renewable non-renewable

coal Vhydroelectricity Vnuclear energy ,,/

oil t/'solar energy Vtidal energy Vwind energy V

[Total: 4]

ForExaminer's

Use

[Turn over

/( more t:h.4nI) boxej tick~cIin a column (-I) -{;,-r ~ct, error:

© UCLES 2012 0625/23/0/N/12

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6

An aluminium rod is cut into a longer section and a shorter section, as shown in Fig. 4.1.

( [)(a) The shorter section of the rod is placed into a measuring cylinder containing water.

©UCLES2012

Fig. 4.1

Fig. 4.2 shows the appearance of the measuring cylinder before and after this is done.

water~<,

/

-

20--:

cm3

50

1-------1 42•••1,040- 40

t-----1- 3'"3.72

30 ----:3/ 30

-

20--:

10-

\

Fig. 4.2 (not full size)

shorter section ofaluminium rod

(i) Calculate the volume of the shorter section of aluminium rod.

- ~2 - 3~-

ForExaminer's

Use

volume = ~ cm3 [3]

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(ii) The mass of this shorter section is measured as 21.2 g.

1. Name a laboratory instrument that might have been used to measure this mas .

.........................b.o.ta.tIC"L. ~]2. Calculate the density of aluminium.

Densi!J = mOlSS Ivotum~ ~I'S

=21.2/g~= .2. 'S

Vo\:. 8

density = 2.~..'.5 3ICrn~ [4]

(b) (i) Name an instrument that could be used to measure the length of the longer sectionof aluminium rod .

..................................':Ru.le or \ir. IlJ(r.. Qr,Jiptrs. [1]

(ii) Suggest a method, different from that in Fig. 4.2, that could be used to determinethe volume of this longer section .

...............»1~4.j~ dJ..alP.dv. (Dr. r.AdJ1Jt) .

(QRI~':~:~tI~~~~~~~~~-=...........000a.{U(t.. tn:t.~(../~ ¢.t! ~r;Ir-.fh,.m [2]

~ 1-1«lf/ D~fir [Total: 11]

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ForExaminer's

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5 (a) In Fig. 5.1, A and B are two parallel plane mirrors. A ray of light strikes mirror A at anangle of incidence of 45°. The ray then reflects, to strike mirror B.

A

B

Fig. 5.1

(i) State the name given to the angle x shown on Fig. 5.1 .

....................................ant'.AI.~ ot rc: ..~Jt..c.:h~O(l [1]-;J-(ii) State the value of

~1. angle x, ~.5 .

5~-- -2. angle y. 4t... . .

(iii) On Fig. 5.1, use your ruler to draw the path of the ray after it leaves the surfaceof B. [1]

© UCLES 2012 0625/23/0/N/12

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[2]

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(b) The mirror B is now rotated so that it reflects the ray of light back along its original path. ForExaminer's

UseOn Fig. 5.2, draw mirror B in the correct position to do this.

A

[1]Fig. 5.2

[Total: 5]

© UCLES 2012 0625/23/0/N/12 [Turn over

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6 Some water in a glass beaker is heated from below, as shown in Fig. 6.1.

__ water

theat

Fig. 6.1

(a) Name the process by which thermal energy is transferred

(i) through the glass, Condu.ttio.n .(ii) throughout the water CO.n.\lf ..c.ti.OO .

[2]

(b) As thermal energy is supplied, the temperature of the water begins to rise. Althoughthe supply of energy remains cone: ant, eventually the temperature becomes steady atabout 80°C.

Suggest why this happens .

...................................h~af lost. af. .

.....................................................J.(J",I! fl:lt.~ "., .

......................................................................v.,e".t ..s.llr'I/~J.. [1]

(c) The rate of energy supply is increased. The temperature of the water begins to riseagain, but eventually becomes steady at a higher temperature. This time many bubblesare seen throughout the water.

(i) State what is now happening to the water.

L_ 'I'................................................DO.I ..f.ft.g [1]

(ii) What gas do the bubbles contain? Tick one box.

air Dhydrogen Doxygen Dsteam ~

[Total: 5]

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[1]

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7 (a) State what is meant by the echo of a sound.

......................~~.f.l.~chOt.1qf s.o.vod .

..........................O.(1; an O~~c.t: .

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

(b) Describe how the echo of a sound may be demonstrated. Include a diagram that showsapproximate sizes and distances.

diagram

---::!!!» --_...£------

description of method .

.....................Set a Sound .s.~v.,{U W~·lb...~ JQ.UJ. .

....... s:-oUAci Ot\ ~ cl.\\~n6. .fWI.~~ .

..........................-t~~ I.S.O m / £~stcn..to. tIu .

..........................~.c:~c······l..2n.t·s.QV~) .

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

,(c) The demonstration in (b) is used to find the speed of sound in air.

(i) Which two measurements should be made?

1 d"sfQn~ ~f.Wf.~ S.O.U.V\O' ~ Qb.s.+~.~k .2 tiJn~ ~<~ ~4\(.\!!'jS;)IHld.Ik!>J ..hj!'4(.i~i

(ii) State how you would calculate the speed of sound from these measurements .

.........................sp.e~J.= d;..sm.••<L./..t,~tN. .

..........(.ol.;.tt-att.C#. X .2. ) Qr,: .

.................( ..t,Il\A- ...::- 2.) , [2]

[Total: 9]

© UCLES 2012 0625/23/0/N/12 [Turn over

ForExaminer's

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Hany El-Gezaw

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12

8 Fig. 8.1 represents the circuit that operates two of the lamps on a car.

(a) In the space below, draw the circuit diagram for this circuit, using conventional symbols.

switch

lamps

rig. 8.1

41---

(b) The car battery has an e.m.f. of 12V and, when the lamps are switched on, there is acurrent of 1.6 A in each lamp.

Calculate the resistance of one of the lamps.

© UCLES 2012

12= _(I)I.'

[3]

( I) ( ')

resistance = ~.~.; ~ [4]

0625/23/0/N/12

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13

(c) When the switch is turned on, both lamps should light up. On one occasion when thedriver operates the switch, lamp L2 ~ to light up.

Suggest a reason for this.

: L·2············ha.s bIDWf.l .........o.a L2···········j.·S .{O.OSL ....................................................................................................................................... [1]

(d) An amateur workman connects a length of wire across lamp L2 and shorts it out.

When the switch is closed for the first time after this, what happens, if anything, to

(i) the fuse, b.l.o..w.s .(ii) lamp L1' N.o1lfit1J ../.d.o.e.tnof l.«jhf .

(iii) lamp L2? No.tttittj / dot..sm:J.t ...LI# ·[3i

[Total: 11]

L,

© UCLES 2012 0625/23/0/N/12

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14

9 (a) Magnets A and B, shown in Fig. 9.1, attract each other.

Is NI Ismagnet A magnet B

Fig. 9.1

The S pole of magnet A has been marked.

On Fig. 9.1, mark the polarities of the other poles, using the letters N or S. [1]

(b) A soft-iron rod and a steel rod each have coils around them. Both rods are initiallyunmagnetised. The coils are attached to circuits, as shown in Fig. 9.2.

steel

Fig. 9.2

(i) Use the following statements to complete the table referring to the soft-iron rod andthe steel rod shown in Fig. 9.2.

magnetised loses its magnetism keeps its magnetism

switch closed switch open

soft iron

steel

(ii) Which words apply to the force bo ween the rods when the switches are closed?

Tick one box.

D~ ---7D

no force

attractive force

repulsive force

© UCLES 2012 0625/23/0/N/12

[2]

ForExaminer's

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(iii) Which of the two arrangements in Fig. 9.2 would be used as the electromagnet onthe crane in a scrap-metal yard?

.......~ ..orw wi1h t:It(.so.ft ..fr:o.n ~ [1]-(iv) State one advantage that an electromagnet could have in comparison with a

similar-sized permanent magnet.

..............Can ~ Sw.itc.'di olJ··l·o.(f. .

..............C(;4n b!z J.~~.t;r. (CiJ4'1Jl S~m) [1]

[Total: 6]

© UCLES 2012 0625/23/0/N/12

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16

10 (a) Suggest how a plastic rod may be given an electrostatic charge.~ ............................................................................................................................................

....Hbyrubbi~Hjt.W.;(ti4.H......

When a plastic rod with a positive charge is held near the suspended charged sphere,the sphere moves to the position shown in Fig. 10.1.

plastic rodinsulating threadl-

I-

++I-

+++

_____charged sphere

Fig.10.1

. "AffII,~'~(i) State the sign of the charge on the sphere f.1tr' ..r.!I' .

(ii) Give the reason for your answer to (b)(i).

. ..n.~.t. . c.AIJ.. ~S cdftiAc.t .~~HH....HH

.........(.OppOSJ~~ ..) ····························[2·]

(c) On Fig. 10.1, draw an arrow to show he e ectrostatic force on the sphere. [1]

/JOri20r/4f o.'VroJ.J'fr, L./ Si-C(yf,y oren:iJ~<9 r'\ SI'huu .

© UCLES 2012 0625/23/0/N/12

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(d) The positively-charged plastic rod is removed and replaced by a plastic rod with anegative charge.

Describe the position that the suspended sphere now takes .

..........................................5.wJ~~.S tQ. 'R'J.ht .

.................OR m.o\'-C.s A~ .

.............OR r:.e.pctb.;cn... t-Arct ..flaCc- [1]

[Total: 6]

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18

11 (a) The charges on the particles in an atom may be represented by

o or +1 or -1.

The masses of the particles in an atom may be represented by

o or m or 2000m.

Using these choices, complete the table below.

particle charge mass

electron -1 m

neutron 0 ~OOO ",proton -+f :2000 m

[4](b) How many of each of these particles are there in a neutral atom of 2~~U?

number of electrons = 9'.2. .number of neutrons = ..l.~.6 .

number of protons = 9..2 .[3]

~-;r ~ eK4mi~d;~ hot rrwlh40~!2. ODO m

YOIJ. atn Us:t1~t,O m'&'3cr me~ ~ yo~ ~\C -b:, doocp

~" a: r71(fIfftw·d ~~~ -<.~~ .•.....

( P-rI1) ~~ -:1 e-:. ns.l{ potI rt. ~ fUlAfr(J(/ Jl,",

yu ./ rz. = Yl,uci.tOf'l. -J no re- -

• 29%- 92.

= ''''''

tIl oil•

238--92 _U_ (p)

©UCLES 2012 0625/23/0/N/12

[Total: 7]

ForExaminer's

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19

12 Fig. 12.1 shows the graph of the count rate from a radioactive source over a period of time.The readings have already had the background count rate subtracted.

1000

count ratecounts/s

I

200-

\00

I':0-

( 50time/s

." I: r;c)llrl rue to decrease from 1000 counts/s to(a) From Fig. 1~.1, finrl tI,~ irne lakr,,)125 counts .

, "t' _ 31.5 \'3i. \~ 3;.', ,- s [1]

(b) How many hllf-'ivps of the rwr"'l('I;V(' ma: I I we're there during the time interval

in (a)? 1000 ~~>-SOu ts~>lSO at~~nt II, ~pr ( ~,IIf lives = 3 [1]

(c) From your answers to (;1 lnrl (I r :\UI3t~ the h:tlf-life of the material.

, _ 12- (/2 _I!)h(llf- I e - 5 s [2]

(d) On Fig. 12.1, sketch he curve ti'3t might have ''''t''l plotted if the background count ratehad not bee" 51 I :r·lcteJ. [1]

o.bove. 8?<i~·I"iYl'l~.r». (("0 ~"h~ MnUltJ JJ J / r: [fotal: 5]

© UCLES 2012 OG2S/23/0/N!12

60

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