1. PHYSICS
2 uNrr
GeneralInstructions
o Assessment
TaskNo. 4
. Weighting- 40Yo
o Readingtime - 5 minutes
r Working time - 2 hours
. PhysicsFormulae&Data Sheetsare
attachedto theback of this paper.
. The Multiple ChoiceAnswer Sheetis
attachedto theback of this paper.
Carefully tearit off readyfor useand
write yournameon it.
NAME:
TEACHER:
2004
P R E L I M I N A R Y C O U R S E
F I N A L E X A M I N A T I O N
This examinationhasTWO parts.
Part A Multiple Choice
Total marks(16)
. Attempt ALL Questions
o Mark your answerson the Multiple ChoiceAnswer
Sheetprovided.
o Allow about30 minutesfor this part.
Part B Extended Answer Questions
Total marks(50)
. Attempt ALL Questions
o Write your answersin the spaces
provided in this
ExamPaper.
o Allow about t hour and30 minutesfor this part.
2. MULTIPLE CHOICE QUESTIONS
Total Marks (16)
Attempt questions
1- 16
Allow about30 minutesfor this part
Answer the questionson the Multiple ChoiceAnswer Sheetprovided.
l. A popular Sydneyradio stationhasa transmittingfrequencyof 96.1MHz.
What is the wavelength
of thiswave in metres?
(A) 3.2x107
( B ) 3 . 1
x 1 0 6
(c) 3.1
(D) 0.32
L, An electromagneticwave may undergototal internal reflection when
(A) The wavetravelsfrom a medium where its velocity is relatively high to a
medium where its velocity is relatively low-
(B) The wave travelsfrom a medium where its velocity is relatively low to a
medium whereits velocity is relatively high.
(C) The angleof incidenceis largerthanthe angleof refraction-
(D) The angleof incidenceis smallerthan the critical angle.
3 The following diagramillustratesa soundwave appearingon the screenof an
oscilloscope.
Thespeed
of thewaveis343m/s. Eachhorizontal
grid divisiononthescreen
isworth5 x 10-3
seconds.
Determine
thewavelength
of thewave.
(A) 5.1m
(B) 15m
(C) 6em
(D) 1700
m
A / n n
t / t / t / I
3. + Which of the following starswould havethe lowest surfacetemperature?
(A) blue giant
(B) yellow main sequence
(C) white dwarf
(D) red giant
5. The diagramsshowtwo differentcircuits.All resistorsareidentical.
Which statementaboutthe currentsflowine in the resistorsis correct?
(A) The currentin all resistorsis the same.
(B) The currentsin Rl and R2 areone quarterthe currentsin R3 andR4.
(C) The currentsin Rl andR2 aretwice the currentsin R3 andR4.
(D) The currentsin Rl and R2 arehalf the currentsin R3 and R4.
Which statementaboutelectricalpower is correct?
Poweris a measureof the rate at which electrical energyis changedinto other
forms of energy.
Powermeasures
how much electricalenergyis usedby an applianceeachtime
it is used.
Poweris a measureof the amount of energya power supply can supply to an
electricalcircuit.
The power of an energysourceis determinedby its voltage.
what propertyof a fuse wire makesit useful asa safetydevice in the home?
(A) It hasa relativelylow melting point.
(B) It canbereadily replaced.
(C) It hasa lower resistance
thanthe wires usedin therestof the circuit.
(D) It hasa large cross-sectionalarea.
6.
(A)
(B)
(c)
(D)
7.
4. 8. Jennyrvasgivenfourpairsof coiledwires.Eachcoil waslinkedto its own DC
source.
Pair I
Pair?ww
Pair3ww
Fair 4
Which two pairs of coils did Jennycorrectly predict would attracteachother?
(A) Pairs2 and3
(B) Pairs1 and4
(C) Pairs3 and4
(D) PairsI and2
9. A carof mass3600kg is travellingin a circularpathof radius l0m at a speed
of
30km h-l- What is the sidewaysforce neededto keepthe carmoving in the circular
path?
t0.
(A)
(B)
(c)
(D)
(A)
(B)
(c)
(D)
A safetydeviceis utilised in a circuit in a house.When a dangerousamountof current
flows, the generatedmagneticfield from an electromagnet
in the circuits, is large
enoughto attracta switch, which breaksthe circuit. This safetydevice is called
O N
10800
N
25000
N
324000
N
a fuse
double insulation
earthing
a circuit breaker
5. I l. The displacement
vs time graphbelow showsgraphsof four differentmotions.
Time
Whichgraphshows
themotionof anobjectthat hasdecreasing
velocity?
(A) GraphP
(B) GraphQ
(C) GraphR
(D) GraphS
17,. Theinertiaof avehicleis its
(A) tendency
to remainatuniformvelocityor in restposition.
(B) massmultipliedbyitsvelocity
(C) change
in momentum
(D) mass
which statementcorrectly comparesthe termsluminosity andbrightness?
(A) Brightnessand luminosity both refer to the energyradiatedby a glowing
object.
(B) Luminosityis the energyradiatedper secondwhile brightnessis the energy
per squaremetrereceivedper second.
(C) Brightnessis the energyradiatedper secondwhile luminosity is the energyper
squaremetrereceivedper second.
(D) Luminosity is the powerof a starandbrightnessis the energyradiatedby a
glowing object.
q)
-
!)
C)
(g
U)
t3.
6. l+ { r"t of Christmastreelightscontainsten lampsconnected
in seriesasshownin the
olaSram.
When rhelamps are pluggedin urd swirchedon, it is found that lamps 1 to 9 glow
brightly butlamp l0 doesnot
Which of thefollowing statemenrbestexplainswhy lamp l0 is notglowingbrightly?
(A) Thefilamentoflampl0isbroken
(B) Thereis abreakin thewire leadingto lamp 10.
(C) Thelamps I to 9 areblockingthecurrentfromlamp 10.
(D) Theresistance
oflamp 10is toolow.
1 5 . The diagramshowstheresultsof testingthe penetratingability of differentkindsof
radiation,
labelledR, S andT.
Radiation
R
3mmalunrinium
RadiationS paper
RadiationT
Which alternativecorrectlynamesthe radiationtypes?
(A)
(B)
(c)
(D)
r 2 3 4 s 6 7 8 9 1 0
r !,, .1, .J-, .J-r rl, .,-i-, .,,j-r .A, .'j
RadiationR RadiationS RadiationT
beta samma alpha
beta alpha gamma
gamma beta alpha
qamma alpha beta
7. | 6" The velocity of object A relative to object B is defined asthe velocity of A
minus the velocity of B, or mathematically:
V , q n : V A - V B
Usethis definition to answer the following question.
Two vehicles,eachtravelling at 60km h-l, approachan intersection.
CarA approaches
from the southandcarB from the east.
--ln
t I
l u
l l h
tw$
e
Whatisthevelocityof carB relative
to carA?
(A) 60kmh-rSw
(B) 60kmh-'NE
(C) 85kmh-rSw
(D) 85kmh-tNE
8. EXTENDED ANSWER QUESTIONS
Total Marks (50)
Attempt questions17- 28
Allow about I hour and 30 minutesfor this part
Answerthe questionsin thespaceprovidedon this paper.
The elechomagneticradiation that reachesthe outer atmosphereof the Earth is z
approximately 1400 wm-2. If the distance from the sun to the Earth is
l-4 x 10" m and the distancefrom the Sun to Uranus is 2.g x l0l2 m, determine
the intensity of the electromagneticradiationreachingUranus.
Question17(2 marks)
Question 18 (4 marks)
4 rays of light areincident upon a mirrored surface.
(a) Identiff the shapeof the surface.
on the diagram,constructthe rays asthey reflect off the surface.
Describean application for the surface.
Marks
Marks
o)
(c)
9. QUESTION 19 (4 Marks)
The graphs below describethe sametransversewave.
T'ime
(s)
Distance
(m)
For this transversewave determine the:
(a) Wavelength:
(b) Amplitude:
(c) Frequency:
Marks
- 1 0
Displacement
(m)
(d) vertical displacementof point P, 20slater than the time shown above.
11. QUESTION 21 (4 Marks)
This questionrefers to the Hertzsprung-Russell diagram below.
rtace Temperature(K)
(a) Identify the main sourceof emissionof radiation from stars of the type
Iocatedat position X.
(b) on the HR diagram clearly label the Main sequenceand the position of
White Dwarf stars.
(c) Our own Main Sequencestar, the Sunoemitsboth particles and radiation
in the direction of the Earth. A continuous stream of particles passes
the
Earth at speedsup to 700 km/s. Identify the particulate nature of this
solarwind.
12. QUESTION 22 (5 Marks)
Describean experimental method that could be usedto determine whether a
particular resistor, obeysOhm's Law. As part of the method, draw a
diagram of the circuit you would use.
13. Question23(6 marks)
A studentperformedan experimentto measure
the way a beamof light was bentupon
enteringa transparent
prism. The following graphwasproducedfrom the measurements.
srn t
0.4
0.2
0.0
- - - - - - - - - _ t
(a)
0.0 0.1 0.2 0.3 0.4 0.5
st! r
Yl"t
relalionshipdoesthe datasuggest?use this relationshipto find the refractive
indexof the transparent
material.
(b) Given that the refractive index of the transparentmaterial is constant,assess
the
reliability of the aboveresults.
(c) Refractionis caused
by
1!" change
in verocityof a waveasit crosses
the
boundarybetween
two differentmedia. outiine howthechange
in velocityof
a wavefrontcauses
thewavefrontto bend. usea diagramin your answer.
14. Question
24(4marks)
Peter
cycles
to school
fromhome.Thegraphrepresents
hisjourney.
{
5
c
2
I
n
(a) What is Peter'svelocity after70 seconds?
Marks
h
E
>
(}
o
(b) After how many secondsdid Peter stop for the first time?
(c) CalculatePeter'sacceleration
at the endof hisjourney (betweenpointsX andY).
(d) If Peterandhis bike havea combinedmassof 60 kg, calculatetheresultantforce
actingon Peterandhis bike ashe reduceshis velocity at the endof hisjourney
(betweenpointsX andY).
15. QUESTION 2f(4 Marks)
Assessthe effectsof sunspotactivity on Earth's power grid and satellite
communications.
Question
26(4 marks)
Thediagram
showsacarmovinguphillatconstant
velocity.
(a)
(b)
Marks
On the diagram,uselabelledarrowsto show all the forces acting on the carthat
determinethe velocitv of the car.
Write a statementto describethe net force on the car.
3
I
16. QUESTION 27(2 Marks)
The graphs below show the amount of radiation (energydensity) emitted from a
body at various temperaturesasa function of wavelength.
Wavelength(m) x 10-6
(a) At what wavelength (approximately) doesthe body emit the most radiation,
when the body is at a temperature of 6000K?
(b) The graphs show a trend betweenthe temperature of the body and the
dominant wavelength of radiation emitted from the body. Identify this trend.
Visible
Region
between
dotted
lines
o
X
a
V)
u)
()
bs
fi
C)
r-l
17. QUESTION 28 (6 Marks)
The graphbelow showsthe time variation of momentum for a 3 kg massmoving in a
straightline andsubjectedto a constantretardingforce. During this time the object
undergoes
a collision.
t0
mornenlum 8
d 3kgmoss^
(kgms-t1
o
6
2
0
Marks
- T - - r
l l
- t - +
t l
- 1 - +
l l
- -f --t
1 t
- + - +
r l
_ T _ - T
l l
- 1 - t
l l
- + - +
l l
- + - +
l l
= * - J
- T
I
_ T
I
- f
I
- T
I
- - r
I
-+
I
I
- T
- T
I
--t
I
- T
I
- - T
I
- +
I
T - T
r l
+ - +
5 6 7 8 I 1 0 1 1 1 2 1 3
time {s)
(a) Find the speedof themassattime t:3s.
(b) Determinethe magnitudeof theretardingforce actingon the 3 kg massat time
t : 3 s .
(c) At t:6s, the3 kg masscollidesheadon with a stationaryI kg mass. The two
masses
moveoff in the samestraightline. Calculatethespeedof the lkg mass
immediatelyafterthe collision.
2 3 t ,
- + - t
l t
- t - t
l l
--f - -t
l l
l l
I
+
I
+
I
+
I
- + - t
I t
-T--t
f f
- + - +
1 l
