2019 senior external examination: physics paper one — question … · question 1 respond to this...

2019 Senior External Examination

PhysicsPaper One — Question book

Thursday 31 October 20199 am to 11:40 am

Time allowed• Perusal time: 10 minutes• Working time: 2 hours 30 minutes

Examination materials provided• Paper One — Question book• Paper One — Multiple-choice response sheet• Paper One — Response book• Paper One — Resource book

Equipment allowed• QCAA-approved equipment• ruler graduated in millimetres• non-programmable calculator• graphing calculator

DirectionsDo not write during perusal time.Paper One has two parts:

• Part A — Knowledge of subject matterSection 1 — Multiple choiceSection 2 — Short response

• Part B — Scientific processesAttempt all questions.

Suggested time allocation• Part A: 1 hour 30 minutes• Part B: 1 hour

AssessmentPaper One assesses the following assessment criteria:

• Knowledge of subject matter• Scientific processes

Assessment standards are at the end of this book.

After the examination sessionThe supervisor will collect this book when you leave.

Planning space

12019 Physics — Question book — Paper One

Part A — Knowledge of subject matterPart A assesses knowledge of subject matter and its simple application based on the topics in the Physics Senior External Syllabus 2000 (amended 2003).Section 1 is worth 15 marks. Section 2 is worth 25 marks.Suggested time allocation: 1 hour and 30 minutes.

Section 1 — Multiple choiceSection 1 has 15 questions each worth one mark. Attempt all questions.Each question contains four options. Select the option that you think is correct or is the best option. Respond on the multiple-choice response sheet.

Question 1Newton’s law of universal gravitation is given below:

2F Gm mr

=1

2

In this case:

m1 = 245.98 10 kg×

m2 = 227.4 10 kg×

r = 53.851 10 m×

G = 11 2 26.67 10 N m kg− −×

If the value for F was determined, how many significant figures should it be expressed to?

A 1B 2C 3D 4

2 2019 Physics — Question book — Paper One

Question 2The graph below shows the change in displacement over time for an object.

According to the graph, the object experienced a net forceA when t = 4 and t = 6.B when 0 ≤ t ≤ 4 and 6 ≤ t ≤ 8.C when 4 ≤ t ≤ 6.D at every point of time throughout the 8 seconds recorded.

Question 3A projectile is fired horizontally from a particular height with an initial velocity of 45 m s–1. At the same time, a second projectile is fired horizontally from the same height with an initial velocity of 9.0 m s–1. The first projectile travels a distance of 180 m. The second projectile will travel a horizontal distance of

A 9.0 m.

B 36 m.

C 45 m.

D 90 m.

Question 4The acceleration due to gravity on Earth’s surface is represented by g. The mass of Mars is approximately one-tenth the mass of Earth. The radius of Mars is approximately one-half the radius of Earth. The acceleration due to gravity on the surface of Mars is approximately

A 40g

B 5g

C 25g

D 40 g


Question 5A projectile is fired horizontally at 100 m s–1. The projectile impacts the target placed 500 m away.

The vertical velocity of the projectile when it impacts the target is

A 0 m s–1.

B 24.5 m s–1.

C 49 m s–1.

D 100 m s–1.

Question 6Which of the following contains only base units?

A J, m and s.

B J, kg and s.

C m, s and A.

D m, kg and s.

Question 7Which of the following statements is true?

A Standing waves cannot propagate energy.

B Standing waves can occur in all waves.

C Standing waves can only be created using two waves of differing amplitudes.

D Standing waves can only be created using two waves of differing wavelengths.

Question 8In which one of the circuits below is it possible to vary the current in the lamp by adjusting the variable resistor?

Question 9The critical angle at which total internal reflection occurs when light travels from a dense to less dense medium is not affected by

A the intensity of the light.

B the wavelength of the incident light.

C the relative velocities of light in each media.

D the relative refractive indices of the two media.


Question 10The power rating of an appliance indicates

A the energy efficiency of the appliance.

B the rate of energy use by the appliance.

C the amount of energy lost by the appliance over time.

D the proportion of voltage applied to the appliance with respect to the current drawn by the appliance.

Question 11An electrically charged point source, P, is positioned on a grid as shown below.

Which of the points are positioned in a region with equal electric field strength?

A A and C

B B and G

C A, D and F

D C, D and E

Question 12A magnetic field exists around a current carrying wire as indicated in the diagram below. At point P the field strength is 4.00×10–5 T.

If the current through the wire is doubled, then

A the field strength at A is 41 6 10 T−×. into the paper.

B the field strength at B is 41 6 10 T−×. out of the paper.

C the field strength at C is 45 3 10 T−×. into the paper.

D the field strength at D is 43 2 10 T−×. out of the paper.


Question 13A current measured through the base of a transistor is 2.0 mA. The transistor gain is 12.

The current through the collector of the transistor is approximately

A 6.0 mA.

B 10 mA.

C 14 mA.

D 24 mA.

Question 14The element represented by 92

40 X is

A calcium.

B uranium.

C niobium.

D zirconium.

Question 15A bone spear-tip is unearthed by an archaeologist and is found to contain 1/128th of the carbon-14 present when it was part of a living organism. Given the half-life of carbon-14 is 5730 years, the bone is approximately

A 4470 years old.

B 7350 years old.

C 40 100 years old.

D 735 000 years old.

End of Section 1


Section 2 — Short responseSection 2 has 10 questions, worth a total of 25 marks. Attempt all questions.Write your responses in the response book. Show all working.

Question 1State the number of significant figures in each of these values.

a. 020

b. 0.23

(1 mark)

Question 2Convert the percentage error into an absolute error.

105 ± 40 %

(1 mark)

Question 3A 10 kg object travelling at 14 m s–1 experiences an opposing force slowing it to 2 m s–1 in 4 s.

Calculate the force experienced by the object.

(3 marks)

Question 4An elevator carries a 2500.0 kg load to the top of a building 320.0 m upwards in 110.0 s.

a. Calculate the work done by the elevator to move this load to the top of the building.

b. Calculate the power required to do this. (4 marks)

Question 5Two in-phase point sources, A and B, generate waves as shown in the diagram below. The solid lines indicate crests while the dotted lines indicate troughs. Calculate the path difference between the lines AP and BP, and state the type of interference produced at point P.

(2 marks)


Question 6An experiment, similar to Young’s double-slit experiment, was conducted using monochromatic light with a wavelength of 530.0 nm. The light sources were separated by a distance of 32 00 10 m. −× and the screen was 6.00 m away. Calculate the distance between adjacent dark fringes produced on the screen.

(3 marks)

Question 7A charge of 141 5 10 C. −× is moved across a potential difference of 23 2 10 V. × . If 129 6 10 W. −× of power is applied to the charge, how long will it take for the charge to move across the potential difference?

(3 marks)

Question 8A label from an LCD television is shown below.

What is the internal resistance of the LCD television?

(3 marks)

Question 9An alpha particle, having a charge of 193 20 10 C. −× and travelling with a velocity of 6940 m s–1, enters a magnetic field of strength 8.33 T at an angle of 85.0° to the field lines. Calculate the force experienced by the alpha particle as a result of interacting with the field.

(3 marks)

Question 10Thorium-227 is an unstable element that can decay into radium-223.

Write a balanced nuclear equation for this reaction and state the type of decay occurring. (2 marks)

End of Section 2End of Part A


Part B — Scientific processesPart B assesses scientific processes based on the topics in the Physics Senior External Syllabus 2000 (amended 2003) and practical work undertaken during your study of the subject.Part B has six questions, worth a total of 25 marks. Attempt all questions.Write your responses in the response book. Show all working.Suggested time allocation: 1 hour.

Question 1Respond to this question on page 25 of your response book. Spare response space is provided on page 30.

Coffee bean roasters say that the ‘roast profile’ of the roast determines the flavour of the coffee beans. The ‘roast profile’ is a graph of the bean temperature with respect to time during the roasting process.

Roasters have shown that:

• less time in the Maillard phase results in less complex, lighter bodied and lighter flavoured coffee.

• more time in the Maillard phase results in more complex, heavier bodied and richer flavoured coffee.

• more time in the caramelisation and pyrolysis phase results in soft, rounded (less acidic) and fruit flavours.

• less time in the caramelisation and pyrolysis phase results in bright, bitter (more acidic) and vegetal flavours.

Three roasting profile graphs have been provided on the next page.

Label the statements below as ‘supported’ or ‘unsupported’ by the roast profile graphs.

a. Roast profile 3 will have a more complex, heavier bodied and richer flavour than roast profile 1.

b. Roast profile 2 will have a more complex, softer and fruitier flavours than roast profile 3.

c. Roast profile 1 will have a more complex and a richer flavoured coffee than either roast profile 2 or 3.

d. Coffee roasted using roast profile 1 will result in a more acidic flavoured coffee than coffee roasted using roast profile 2.

(4 marks)


Question 2Respond to this question on page 26 of your response book. A spare diagram is provided on page 31.

The ‘cut’ of a diamond determines how ‘sparkly’ it is. An ideal cut diamond ensures that the light entering the diamond through the top surface reflects out through the top surface of the diamond.

Diagrams showing how light interacts with a deep-cut, shallow-cut and ideal-cut diamond have been provided below.

Use the symbols = , ≤ , ≥ , < , and/or > to complete the following statements, where θc represents the critical angle:

Deep-cut diamonds are those where θ1 _____ θc and θ2 _____ θc

Shallow-cut diamonds are those where θ3 _____ θc

Ideal-cut diamonds are those where θ4 _____ θc and θ4 _____ θ5

(3 marks)

Question 3Respond to this question on page 26 of your response book. A spare diagram is provided on page 31.

The diagram below shows two wave forms travelling in opposite directions with speeds as indicated.

Use the principle of superposition to sketch the wave shape 1.5 seconds after the time indicated on the graph.

(4 marks)


Question 4Respond to this question on page 27 of your response book. Spare grid and response space are provided on page 32.

The table below contains temperature data for an unknown liquid cooled over time.

Time t (seconds) 0 40 80 120 160 200 240 280 320 360

Temperature T (°C) 23 17 12 7 4 –1 –2 –7 –9 –9

a. Label the axes and plot the information on the graph provided in your response book, ensuring you title the graph.

b. What is the likely freezing point of the liquid?

(5 marks)

Question 5Respond to this question on page 28 of your response book. Spare response space is provided on page 33.

Design an experiment to compare the energy efficiency of two different brands of light bulbs.

(5 marks)

Question 6Respond to this question on page 29 of your response book. Spare grid and response space are provided on page 34.

The graphs below show:• the relative volume of a gas bubble at various depths under water

• the pressure at various depths under water.

a. In your response book, sketch the general shape of the graph showing the relationship between pressure and the relative volume of a gas bubble (no numbers are necessary).

b. At what pressure would one expect the gas bubble to be 1/5 th its original volume.

c. Suggest a general formula that relates the relative volume of the gas bubble to pressure.

(4 marks)End of Part B

End of Paper One


Asse

ssm

ent s

tand

ards

from

the P

hysic

s Sen

ior E

xter

nal S

yllab

us 2

000

(am

ende

d 20

03)

Pape

r One

Crite

rion

Very

hig

h ac

hiev

emen

tHi

gh ac

hiev

emen

tSo

und

achi

evem

ent

Limite

d ac

hiev

emen

tVe

ry li

mite

d ac

hiev

emen

t

Know

ledg

e of s

ubje

ct

mat

ter

A ve

ry h

igh ab

ility

to re

call a

nd

appl

y kno

wled

ge in

sim

ple

situa

tions

.

A hi

gh ab

ility

to re

call a

nd ap

ply

know

ledg

e in

simpl

e situ

atio

ns.

A sa

tisfa

ctor

y abi

lity t

o rec

all

and

appl

y kno

wled

ge in

sim

ple

situa

tions

.

A lim

ited

abili

ty to

reca

ll and

ap

ply k

nowl

edge

in si

mpl

e sit

uatio

ns.

A ve

ry lim

ited

abili

ty to

reca

ll an

d ap

ply k

nowl

edge

in si

mpl

e sit

uatio

ns.

Scie

ntifi

c pro

cess

esA

very

high

abili

ty to

succ

eed

in

simpl

e scie

ntifi

c pro

cess

task

s —

colle

ctin

g and

orga

nisin

g da

ta, p

roce

ssin

g inf

orm

atio

n,

mak

ing s

impl

e jud

gmen

ts,

com

mun

icatin

g inf

orm

atio

n in

va

rious

cont

exts

, dev

ising

and

desig

ning

sim

ple/

single

step

in

vest

igatio

ns.

A hi

gh ab

ility

to su

ccee

d in

sim

ple s

cient

ific p

roce

ss ta

sks

— co

llect

ing a

nd or

gani

sing

data

, pro

cess

ing i

nfor

mat

ion,

m

akin

g sim

ple j

udgm

ents

, co

mm

unica

ting i

nfor

mat

ion

in

vario

us co

ntex

ts, d

evisi

ng an

d de

signi

ng si

mpl

e/sin

gle st

ep

inve

stiga

tions

.

A sa

tisfa

ctor

y abi

lity t

o su

ccee

d in

sim

ple s

cient

ific

proc

ess t

asks

— co

llect

ing a

nd

orga

nisin

g dat

a, p

roce

ssin

g in

form

atio

n, m

akin

g sim

ple

judg

men

ts, c

omm

unica

ting

info

rmat

ion

in va

rious

cont

exts

, de

visin

g and

des

ignin

g sim

ple/

single

step

inve

stiga

tions

.

A lim

ited

abili

ty to

succ

eed

in

simpl

e scie

ntifi

c pro

cess

task

s.A

very

limite

d ab

ility

to su

ccee

d in

sim

ple s

cient

ific p

roce

ss

task

s.

© The State of Queensland (Queensland Curriculum and Assessment Authority) 2019

Copyright enquiries should be made to:

ManagerPublishing UnitEmail: publishing@[email protected]

Queensland Curriculum& Assessment AuthorityPO Box 307, Spring Hill QLD 4004 AustraliaLevel 7, 154 Melbourne Street, South BrisbaneT +61 7 3864 0299

www.qcaa.qld.edu.au

2019 senior external examination: physics paper one — question … · question 1 respond to this...

Documents