12

27 Which statement describes a property of a magnet?o It attracts ferrous materials.

B It could have only one pole (north or south).

C It points in a random direction when suspended.

D It repels non-ferrous materials.

28 Which procedure may be used to demagnetise a steel bar?

A cooling it in a freezer

B earthing it with a copper wire

C placing it in a solenoid carrying a large direct current (d.c.)

CV striking it repeatedly with a hammer

29 In which unit is potential difference measured?

A ampere

B ohm

Vvolt

D watt

-I

•...

-~r I

30 The circuit shown in the diagram contains an unknown component X, hidden in a box.

The voltage-current graph for X is as shown.

variable voltage supply+ voltage

o~----------------.-o current

What is the component X?

A a capacitor

B a closed switch

C an open switch

CV a resistor of constant resistance

© UCLES 2012 0625/11/M/J/12

13

[Turn over

Nhich circuit contains a fuse?

A B

D

32 A thermistor is used in a circuit to control a piece of equipment automatically.

What might this circuit be used for?

A lighting an electric lamp as it becomes darker

B ringing an alarm bell if a locked door is opened

C switching on a water heater at a pre-determined time® turning on an air conditioner when the temperature rises

© UCLES 2012 0625/11/M/J/12

14

A student connects a variable potential divider (potentiometer) circuit.

-r-12V :-L--

T

R

s

What happens to the reading on the voltmeter as the sliding terminal T is moved from R to S?

A It decreases from 12 V to a V.

(i) It increases from aV to 12 V.

C It remains at av.o It remains at 12 V.

© UCLES 2012 0625/11/M/J/12

15

A circuit-breaker is designed to protect a circuit which usually carries a current of 2 A.

The time taken to break the circuit depends on the current, as shown in the graph.

time takento break thecircuit/s

160140120

10080

604020

oo

\<,

i--

2 4 6 8 10 14 16 18 2012

current! A

What happens when the current in the circuit is 2A and what happens when the current 18A?

when the current is 2 A when the current is 18A

A the circuit breaks in less than 5 seconds the circuit breaks in less than 5 seconds

B the circuit breaks in less than 5 seconds the circuit does not break

CD the circuit does not break the circuit breaks in less than 5 seconds

D the circuit does not break the circuit does not break

35 The diagram shows a coil connected to a battery and a switch. Two unmagnetised iron bars hangfreely near opposite ends of the coil.

iron bar

coil

y

iron bar

What happens to the iron bars when the switch is closed?

A Both X and Y move away from the coil.

Both X and Y move towards the coil.

e X moves towards the coil, Y moves away from the coil.

D Y moves towards the coil, X moves away from the coil.

© UCLES 2012 0625/11/M/J/12 [Turn over

16

A wire passes between the poles of a horseshoe magnet. There is a current in the wire in thedirection shown, and this causes a force to act on the wire.

wire

force

Three other arrangements, P, Q and R, of the wire and magnet are set up as shown.

P

magnet turned around

Q R

current direction reversed current direction reversedand magnet turned around

Which arrangement or arrangements will cause a force in the same direction as the originalarrangement?

A P, Q and R B P and Q only C P only ~ Ronly

37 The diagram shows a device to produce cathode rays.

evacuated glass container

anodecathode

Which part of the device is heated and why?

part heated reason

A anode to emit electrons

B anode to emit protons

{0 cathode to emit electrons

0 cathode to emit protons

© UCLES 2012 0625/11/M/J/12

17

A radioactive nucleus emits a ~-particle.

./~-particle

pnucleus

What happens to the proton number (atomic number) of the nucleus?

A It stays the same.

® It increases by 1.

C It decreases by 2.

D It decreases by 4.

39 The diagram shows the paths of three different types of radiation, X, Y and Z.

r--

'--

X

Y

Z

2mmofplastic

10mm ofaluminium

Which row in the table correctly identifies X, Y and Z?

X Y Z

A a-particles ~-particles y-rays~

~-particles a-particles~

y-rays

C ~-particles y-rays a-particles

D y-rays a-particles ~-particles

50mmof lead

40 Which diagram could represent the structure of a neutral atom?

A

© UCLES 2012

C

0625/11/M/J/12

Dkeyo neutron@ proton

e electron

14

(a) Complete the following sentences.

(i) An electric current exists in a wire when C.~.~S are madeto flow in the wire. [1]

(ii) The current in a wire may be measured using an instrument called

r.n.ro.e.t~......... [1]

(iii) The potential difference across a wire may be measured by connecting

.......9-......... . .\tm.w. across the wire. [1]

(b) A length of resistance wire is connected in a simple series circuit.

The current in it is O.8A. The potential difference across it is 9.6 V.

Calculate the resistance of the wire.

+?.:: \j .i->: \

I

<4 , b .i-> ~

C.~\

-: ,/'resistance = ..I.2: ~ [4]

(c) The resistance wire in (b) is replaced by a greater length of wire from the same reel.

Without further calculation, state the effect this has on

(i) the resistance in the circuit,o

....................................................\0.~.~.~:. .

(ii) the current in the new wire when there is a potential difference of 9.6V across it, asbefore .

....... J.e.C.. .(:!.S/?; .[2]

[Total: 9]

© UCLES 2012 0625/21/M/J/12

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15

The coil in the d.c. motor in Fig. 9.1 is rotating as shown.

magnet

Fig. 9.1

(a) On Fig. 9.1, clearly label the coil.

(b) State two things that could be done to the apparatus shown in Fig. 9.1 in order to makethe coil rotate more rapidly.

1 J~~~;{ ..0.t~~It.t..9.f. W\q8N.i.t .2 (). '(f0: t ~ b.9J1t~ .

OY' \I\crea~ YllJmbe, o-t-' -tvnt~ [2]

(c) Suggest how the coil could be made to rotate in the opposite direction .

..................................1<~:t!?:r.se w r.r.e-.nt .

.........................................( .c ~u:S.~ ffi~ . ~t·.~..£..t Y.edJ~0-][Total: 4]

ForExaminer's

Use

[1]

0625/21/M/J/12 fTurn over© UCLES 2012

16

Fig. 10.1 shows four different types of switch.

wall-mountedswitch

ceiling-mountedpull-cordswitch flush

wall-mountedswitch

nylon cord~PIUg

%~metalsections

plug switch

Fig. 10.1

(a) In the space below, draw the circuit symbol for a switch.

.i.:»:

(b) (i) Which one of the switches is definitely dangerous to use with mains voltages?

................................................ P.\.LA3·..... .'.t.c.h .(ii) State the reason for your answer to (b)(i) .

..................................~af,,'t i ·3· +. -d.e.cJr:IJ; ~.h9..c.k .

................................:. p..~ed...... t.Q.\ ~, .[2]

© UCLES 2012 0625/21/M/J/12

[1]

ForExaminer's

Use

17

(c) A laundry, where clothes are washed, is likely to have lots of steam and condensation.

(i) Which switch is the most suitable for turning the lights on or off from within thelaundry?

···········································.·f·uJ\;::...cd :). j.t.ch .(ii) State the reason for your answer to (c)(i) .

.....................tj'O~5..t~~ {,\.,.ck ~r.d ..r.~ aJ.ts.~ .

...........~l.~.<)yy.~~nd.u.c11.9.() f. .9. 0. ..r.().et-c:tLmu's ..t..

.............~ e.1.C.fP.s:e.J.. O?.v.et.J~~l~f. I'.().5.I.I\.h,'r<\.".\,~.C .

[3]

(d) The laundry is lit by three mains-voltage lamps. Fig. 10.2 shows the mains supply andthe three lamps.

mainssupply

Fig. 10.2

Complete Fig. 10.2 by adding the switch and the wiring that will allow all three lamps tolight at full brightness when the switch is on. [2]

[Total: 8]

ForExaminer's

Use

0625/21/MI J/12 fTurn over© UCLES 2012

18

Fig. 11.1 shows an electron beam about to enter, at point A, the electric field between twocharged metal plates.

B

1-electronbeam A

1+IIIIIIII

C

Fig. 11.1

(a) On Fig. 11.1, carefully draw the path of the electron beam between A and the line BC.[3]

(b) The voltage across the plates is reversed. State what difference this makes to the pathof the electron beam. ....----

..............................J.t- w.n\ d~.tL.C± t.2p.. . .~ .

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

[Total: 4]

© UCLES 2012 0625/21/M/J/12

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Use

19

The table below gives details about some radioactive substances.

substance symbol type of radiation emitted half-life

barium-139 139Ba beta (~) 85 minutes56

silver-110 110Ag beta (~) 24 seconds47

technetium-99m 99Tc gamma (y) 6.0 hours43

thorium-232 232Th alpha (a) 1.4 x 1010years90

(a) Which of these substances has the greatest number of particles in the nucleus of itsatoms?

...........................................~ .rf. ..l1J :-:-::.:!.3.% [1]

(b) Which of these substances has the least number of electrons in the orbits of a neutralatom?

~ { l'.......................................................n... ..J m: [1]

(c) Which of these substances are emitting particles?

..........................................Ea.r:' ~.D:\ .

.\ '..............................................\ C ~ ~ .v:!.Y.m [2]

(d) Samples of each of these substances are decaying. Each sample starts with the samenumber of atoms.

Which sample decays the most in one hour?

...................................................:->..~.\~ AS) [1]

(e) In the investigation of a blood circulation problem, a patient is given an injectioncontaining one of these substances. The radiation needs to be detectable from outsidethe body.

Which of the substances might be suitable for this use?

+QCh~\Jrn..................................................................................................................................... [1]

[Total: 6]

© UCLES 2012 0625/21/M/J/12

ForExaminer's

Use

10

This question refers to quantities and data shown on the circuit diagram of Fig. 9.1.

6.0V

~--~14

11R

12

X Y

13

2.0Q

Fig. 9.1

(a) State the relationship between

(i) the currents 11,12 and 13' 1..1...~ Iz..:t..J3 [1]

(ii) the currents 11 and 14, J~..::::J..4 (.S.c.tro.e) [1]

(b) The ammeter reads O.80A. Assume it has zero resistance.

Calculate

(i) the potential difference between X and Y,

.:?,'-\ Vp.d. = [1]

p~ ~w.lt( ~(Y sam ~VbI~CJ<- I~

1::VIR-::::.2.''-1 -: 2.

(ii) the current 13'

So Vo H-~ ;lA low~cr.res \stOIrl U2- lAAIIloe: ~.Lt if ~tp

current = 1..~..? A [2]

(iii) the resistance of R.

1\~!4 -==12.+13 -= O,g-t-I\2~ 2A-VTc~ = V'!.oj -t- V;\-)R

G :::: ~~~ + Vi", R. =-t> V ~ 'S.b V

R=- V/r = '$. ~-. _ 1,g~

resistance - [4]

[Total: 9]© UCLES 2012 0625/31/M/J/12

ForExaminer's

Use

(a) Fig. 10.1 shows a wire PO placed between the poles of a magnet. There is a current inwire PO.

N,1/ ,1/ II It ...•v

'-17

S

P o

Fig. 10.1

(i) On Fig. 10.1, sketch lines with arrows to show the direction of the magnetic fieldbetween the poles of the magnet. [1]

(ii) The force on PO is into the paper.

Draw an arrow on PO to show the direction of the current.

(b) The wire PO in Fig. 10.1 is replaced by a narrow beam of ~-particles travelling from leftto right.

(i) Suggest a suitable detector for the ~-particles .

..................................Gel~~JQ C [)kc [1]

(ii) State the direction of the force on the ~-particles .

.......................................Q.Y.t ...~ .....fu ..8l~V\R7...i ...~~..[1]

(iii) Describe the path of the ~-particles in the space between the poles of the magnet.

......................................~~ ~........ . Cu.\[~ .

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

(iv) State what happens to the air molecules along the path of the ~-particles .

................... {\;. f.'..... te.uJs.>.~.... .. ~:5 [1]ClOJ c. e.....l~~Y\0 [Total: 6]

Question 11 is on the next page.

[1]

ForExaminer's

Use

©UCLES 2012 0625/31/M/J/12 rTurn over

,

12

Fig. 11.1 shows part of a circuit designed to switch on a security lamp when it gets dark.

+

A

ForExaminer's

Use

B

Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Everyreasonable effort has been made by the publisher (UCLES) to trace copyright holders. but if any items requiring clearance have unwittingly been included. thepublisher will be pleased to make amends at the earliest possible opportunity.

University of Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University ofCambridge Local Examinations Syndicate (UCLES). which is itself a department of the University of Cambridge.

Fig. 11.1

When there is a current in the relay coil, switch S closes and the lamp L comes on .

.....~n5.i$tQ.r.: [1](a) Write down the name of the component X.

(b) The circuit has gaps at A and at B.

State the components that need to be connected into these gaps for the circuit toperform its required function.

gap A

cr«:

.......................R.~5:S.:b?'C I VQf.J~(J,~.~ Iff:.f..~?t.?r: .

.........................~..p. · .. R-l5ht.~.~e. &a4 ~J.{~~.~.~ .[3]

gap B

(c) The circuit in Fig. 11.1 is modified. The function of lamp L is now to give a warning whenthe temperature becomes too high.

-./'- ----------State any necessary changes of components in the circuit.

r ".......................~.eK.m.l.>·±c?c···i.C.·8a.p·A .. : .

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

[Total: 6]

© UCLES 2012 0625/31/M/J/12

6

The IGCSE class is determining the resistance of a fixed resistor in a circuit.

The circuit is shown in Fig. 3.1.

power.----~source ~

dR

A

Fig. 3.1

resistancewire

(a) A student places the sliding contact on the resistance wire at a distance d = 10.0 cmfrom point A. He measures the current I in the circuit and the p.d. V across the resistorR. He repeats the procedure using dvalues of 30.0cm, 50.0cm, 70.0cm and 90.0cm.

The readings are shown in Table 3.1.

Table 3.1

d /Cn\ V/V I/A

10.0 1.7 1.13

30.0 1.3 0.87

50.0 1.0 0.67

70.0 0.8 0.53

90.0 0.7 0.47

(i) Complete the column headings in the table.

© UCLES 2012 0625/61/M/J/12

ForExaminer's

Use

---,!!I

v Iv2,0

7

(ii) Plot a graph of V/V (y-axis) against 1/ A (x-axis). You do not need to include theoJlg'n (0, 0) on your graph. .~

\ .0

ForExaminer's

Use

J·5 lift [5]

Determine the gradient G of the graph. Show clearly on the graph how you obtainedthe necessary information.

( ~ ,0 -. 0, c;)zz:

(113- Ol'~

o 0.') j.O

\. SI

G = -:.5 [3]

(b) The gradient G of the graph is numerically equal to the resistance R of the resistor R.

(iii)

G

Write a value for the resistance R to a suitable number of significant figures for thisexperiment.

© UCLES 2012 0625/61 IMI J/12

_ \..5 S"LR - [2]

[Total: 10]

rTurn over