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ACT BSSS Physics T — Free Online Pack 0

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ACT BSSS integrated Physics T practice assessment 2026 Edition - Pack 0 v2.0
Updated 12 Oct 2026

2026 Edition

Course alignment: ACT BSSS Physics T course — from 2023

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Course alignment: Physics T course — from 2023.

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ACT BSSS Physics T

20 questions

100 marks

Reading: Teacher-set · Writing: Suggested 120 minutesFree online paper · no PDF download or checkout

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Covered in this pack

  • Current ACT BSSS Physics T course document - Electric and magnetic fields 29 marks · 5 questions
  • Current ACT BSSS Physics T course document - Electromagnetic induction 2 marks · 2 questions
  • Current ACT BSSS Physics T course document - Gravity and motion 12 marks · 3 questions
  • Current ACT BSSS Physics T course document - Quantum theory 2 marks · 2 questions
  • Current ACT BSSS Physics T course document - Science as a Human Endeavour 1 mark · 1 question
  • Current ACT BSSS Physics T course document - Science inquiry skills 41 marks · 3 questions
  • Current ACT BSSS Physics T course document - Special relativity 12 marks · 3 questions
  • Current ACT BSSS Physics T course document - The Standard Model 1 mark · 1 question

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Skill Align ACT BSSS Physics T - Free Online Pack 0

An independently authored school-style assessment with worked answers and question-specific marking guidance.

Paper
Integrated practice assessment
Reading
Teacher-set
Writing
Suggested 120 minutes
Assessment
100 marks

No centrally prescribed ACT BSSS examination formula sheet is claimed. Required numerical constants and formulae beyond the mapped Physics T course relationships are supplied in the relevant question.

Part A - Multiple choice

Questions 1 to 15 (15 marks). Select the best answer for each question.

Question 1

1 mark
A satellite is 8.00 × 10^6 m from Earth's centre. Using M_E = 6.00 × 10^24 kg and G = 6.67 × 10^-11 N m^2 kg^-2, what is the gravitational field strength at the satellite?
Diagram Preview
Earth satellite r = 8.00 × 10^6 m circular orbit
  1. 6.25 N kg^-1
  2. 9.80 N kg^-1
  3. 3.13 N kg^-1
  4. 50.0 N kg^-1

Question 2

1 mark
Two isolated positive point charges are released from rest. Which statement describes their initial motion?
  1. Each accelerates directly towards the other.
  2. Each accelerates directly away from the other.
  3. Only the larger charge accelerates.
  4. Neither charge accelerates because the forces cancel.

Question 3

1 mark
A 0.250 m wire carries 2.00 A perpendicular to a 0.400 T magnetic field. What is the force magnitude on the wire?
  1. 0.0500 N
  2. 0.800 N
  3. 0.200 N
  4. 1.25 N

Question 4

1 mark
An ideal transformer has 600 primary turns and 50 secondary turns. Its primary voltage is 240 V. What is its secondary voltage?
Diagram Preview
AC source 240 V ideal transformercommon iron core600 turns 50 turns secondary circuit secondary load
  1. 2.00 V
  2. 120 V
  3. 2880 V
  4. 20.0 V

Question 5

1 mark
A moving clock records a proper interval of 8.00 microseconds while travelling at 0.600c. What interval is measured in the laboratory?
  1. 10.0 microseconds
  2. 6.40 microseconds
  3. 8.00 microseconds
  4. 12.5 microseconds

Question 6

1 mark
A star's black-body spectrum peaks at 580 nm. Using b = 2.90 × 10^-3 m K, which temperature is closest?
  1. 1.68 × 10^3 K
  2. 5.00 × 10^3 K
  3. 2.00 × 10^4 K
  4. 5.00 × 10^6 K

Question 7

1 mark
Light below a metal's threshold frequency does not eject electrons. What happens if only the light intensity is increased?
  1. Electrons are emitted with greater maximum kinetic energy.
  2. Electrons are emitted after a longer delay.
  3. No electrons are emitted because each photon still has insufficient energy.
  4. The threshold frequency decreases.

Question 8

1 mark
Which quark combination has the charge and baryon structure of a proton?
  1. udd
  2. u anti-d
  3. ddd
  4. uud

Question 9

1 mark
A coil diameter is measured as (50.0 ± 1.0) mm. What is the percentage uncertainty in the diameter?
  1. 2.0%
  2. 0.02%
  3. 1.0%
  4. 50%

Question 10

1 mark
Which event most directly justifies refinement of a physics model?
  1. A result is unpopular with the public.
  2. Repeated high-quality measurements disagree with a prediction outside their uncertainty.
  3. A single uncontrolled trial gives a different value.
  4. A newer model uses more equations.

Question 11

1 mark
The flux through each turn of a 50-turn coil changes by 3.00 mWb in 0.0200 s. What is the magnitude of the average induced emf?
  1. 0.0750 V
  2. 3.00 V
  3. 7.50 V
  4. 150 V

Question 12

1 mark
In a plane electromagnetic wave, how are the electric field, magnetic field and direction of propagation oriented?
  1. The electric and magnetic fields are parallel.
  2. Both fields are parallel to propagation.
  3. Only the electric field oscillates.
  4. All three directions are mutually perpendicular.

Question 13

1 mark
A reaction converts 2.00 × 10^-12 kg of mass into energy. What energy is released? Use c = 3.00 × 10^8 m s^-1.
  1. 1.80 × 10^5 J
  2. 6.00 × 10^-4 J
  3. 1.80 × 10^-4 J
  4. 9.00 × 10^28 J

Question 14

1 mark
A proton moves east through a magnetic field directed north. What is the magnetic-force direction?
  1. Vertically downward
  2. Vertically upward
  3. East
  4. North

Question 15

1 mark
Ignoring air resistance, which quantity remains constant for a projectile after launch?
  1. Its vertical velocity component
  2. Its speed
  3. Its horizontal velocity component
  4. Its displacement from the launch point

Part B - Short answer

Questions 16 and 17 (20 marks). Show working and communicate the relevant physical reasoning.

Question 16

10 marks
Stimulus

An imaging satellite of mass 420 kg travels in a circular orbit 400 km above Earth. Use R_E = 6.37 × 10^6 m, M_E = 5.97 × 10^24 kg and G = 6.67 × 10^-11 N m^2 kg^-2.

Use the supplied context to answer all parts of this question.
Diagram Preview
Earth imaging satellite altitude 400 km circular orbit
(a) 2 marks
Calculate the gravitational field strength at the satellite.
(b) 3 marks
Calculate the satellite's orbital speed and period.
(c) 2 marks
Explain why the satellite is accelerating even though its speed is constant.
(d) 3 marks
After a two-burn orbital transfer and circularisation at a higher altitude, compare the satellite's final gravitational potential energy and circular-orbit speed with their initial values.

Question 17

10 marks
Stimulus

A muon has a proper mean lifetime of 2.20 microseconds. In the laboratory it travels at 0.980c from the upper atmosphere towards a detector. Use c = 3.00 × 10^8 m s^-1.

Use the supplied context to answer all parts of this question.
Graph Preview
00.60.80.90.985.032.291.671.251speed as a fraction of cLorentz factor
(a) 2 marks
State the two postulates of special relativity.
(b) 2 marks
Calculate the mean lifetime measured in the laboratory.
(c) 3 marks
Calculate the mean distance travelled in the laboratory and compare it with a Newtonian estimate using 2.20 microseconds.
(d) 3 marks
Explain how detecting many such muons near sea level supports special relativity.

Part C - Data analysis

Question 18 (20 marks). Analyse the supplied evidence and justify conclusions.

Question 18

20 marks
Stimulus

A student measures maximum photoelectron kinetic energy for a metal. The data are 0.277, 0.691, 1.105 and 1.519 eV at frequencies 5.50, 6.50, 7.50 and 8.50 × 10^14 Hz respectively. Use 1 eV = 1.60 × 10^-19 J.

Use the supplied context to answer all parts of this question.
Graph Preview
5.56.57.58.51.521.110.690.28frequency (10^14 Hz)maximum kinetic energy (eV)
(a) 3 marks
Explain why maximum kinetic energy should be plotted against frequency and state the expected graph form.
(b) 4 marks
Determine the gradient in eV s and convert it to J s.
(c) 4 marks
Determine the work function and threshold frequency.
(d) 4 marks
Predict the effect of doubling light intensity at 7.50 × 10^14 Hz on maximum kinetic energy and photocurrent.
(e) 5 marks
Identify one systematic effect that could bias the inferred work function and describe a check or correction.

Part D - Practical skills

Question 19 (20 marks). Apply science inquiry skills to the investigation.

Question 19

20 marks
Stimulus

A 0.150 m horizontal wire segment lies perpendicular to a nominally uniform magnetic field. Measured forces for currents 0, 1.00, 2.00, 3.00, 4.00 and 5.00 A are 0, 0.0121, 0.0240, 0.0362, 0.0479 and 0.0601 N.

Use the supplied context to answer all parts of this question.
Graph Preview
0123450.0600.0480.0360.0240.0120.000current (A)magnetic force (N)
(a) 4 marks
State a testable hypothesis and identify the independent, dependent and two controlled variables.
(b) 5 marks
Outline a safe method that would collect valid and reliable data.
(c) 4 marks
Determine the force-current gradient and use it to estimate the magnetic flux density.
(d) 3 marks
Evaluate whether the data support the hypothesis.
(e) 4 marks
Explain one important limitation and a justified improvement.

Part E - Extended response

Question 20 (25 marks). Integrate concepts, evidence, context and justified evaluation.

Question 20

25 marks
Stimulus

A Canberra research consortium proposes a compact proton accelerator for detector research and medical-isotope development. During one non-relativistic test, protons enter a 0.800 T field at 1.50 × 10^7 m s^-1 perpendicular to the field. Use m_p = 1.67 × 10^-27 kg and q_p = 1.60 × 10^-19 C, c = 3.00 × 10^8 m s^-1 and 1 eV = 1.60 × 10^-19 J.

Use the supplied context to answer all parts of this question.
Diagram Preview
0.800 T into page p+ proton beam 1.50 × 10^7 m s^-1
(a) 4 marks
Determine the force direction for a proton initially moving to the right in a field into the page, and explain the resulting path.
(b) 4 marks
Calculate the orbit radius and magnetic-force magnitude.
(c) 4 marks
Calculate the proton kinetic energy in joules and electronvolts, and justify the non-relativistic treatment.
(d) 4 marks
Explain how higher-energy accelerators test the Standard Model and why independent replication matters.
(e) 9 marks
Evaluate whether the consortium should proceed. Address scientific benefit, medical or community value, cost, safety, environmental or ethical constraints, and evidence needed for a decision.

ACT BSSS Physics T assessment is school-based. This independent Skill Align practice assessment is not an official ACT BSSS examination and may be adapted by a college or teacher. Skill Align is not affiliated with, authorised by, sponsored by, approved by, or endorsed by ACT BSSS or the ACT Government.

Copyright (c) 2026 Skill Align. Free for personal, non-commercial online viewing at https://skillalign.au. You may share the Skill Align page link. Except as permitted by law or with Skill Align's prior written permission, the pack itself must not be resold, copied, redistributed, republished, automatically extracted, or uploaded to a question bank. Every question, dataset, answer and marking description in this pack is original Skill Align content.

Worked Solutions And Marking Guide

General marking principles

  • Apply each question-specific criterion to the evidence shown; accept equivalent scientifically correct reasoning.
  • Carry forward an earlier numerical error when later physics is internally consistent, unless a later criterion independently assesses the same step.
  • Use the task-specific evidence as an analytic guide while making a coherent judgement across Concepts, Models and Applications, Contexts, and Inquiry Skills.
  • Do not penalise a missing unit more than once in a linked calculation unless units are separately assessed.

Question 1

Answer: 6.25 N kg^-1

g = GM/r^2 = (6.67 × 10^-11)(6.00 × 10^24)/(8.00 × 10^6)^2 = 6.25 N kg^-1.

Question 2

Answer: Each accelerates directly away from the other.

Like charges repel; the forces are equal and opposite, but each charge can accelerate according to its own mass.

Question 3

Answer: 0.200 N

F = BIl = 0.400 × 2.00 × 0.250 = 0.200 N.

Question 4

Answer: 20.0 V

V_s/V_p = N_s/N_p, so V_s = 240(50/600) = 20.0 V.

Question 5

Answer: 10.0 microseconds

At 0.600c, gamma = 1.25, so t = gamma t0 = 10.0 microseconds.

Question 6

Answer: 5.00 × 10^3 K

T = b/lambda_max = 2.90 × 10^-3/(580 × 10^-9) = 5.00 × 10^3 K.

Question 7

Answer: No electrons are emitted because each photon still has insufficient energy.

Increasing intensity increases photon rate, not energy per photon; hf remains below the work function.

Question 8

Answer: uud

Two up quarks and one down quark have charge 2/3 + 2/3 - 1/3 = +1 and form a baryon.

Question 9

Answer: 2.0%

Percentage uncertainty = (1.0/50.0) × 100% = 2.0%.

Question 10

Answer: Repeated high-quality measurements disagree with a prediction outside their uncertainty.

Models are refined when reliable evidence challenges their predictions or another model has greater explanatory power.

Question 11

Answer: 7.50 V

|emf| = N|Delta phi|/Delta t = 50(0.00300)/0.0200 = 7.50 V.

Question 12

Answer: All three directions are mutually perpendicular.

An electromagnetic wave is transverse: E and B are perpendicular to each other and to propagation.

Question 13

Answer: 1.80 × 10^5 J

Delta E = Delta mc^2 = 2.00 × 10^-12(3.00 × 10^8)^2 = 1.80 × 10^5 J.

Question 14

Answer: Vertically upward

For a positive charge, v cross B gives east cross north, which is vertically upward.

Question 15

Answer: Its horizontal velocity component

With no horizontal force, horizontal acceleration is zero, while gravity changes the vertical component.

Question 16

(a) The orbital radius is 6.77 × 10^6 m. Thus g = GM/r^2 = 8.69 N kg^-1.

(b) v = sqrt(GM/r) = 7.67 × 10^3 m s^-1. T = 2πr/v = 5.55 × 10^3 s, about 92.5 min.

(c) Its velocity direction changes continuously. Gravity provides an inward acceleration v^2/r perpendicular to the instantaneous velocity, changing direction but not speed.

(d) The satellite gains gravitational potential energy because work is done against the field. Its final circular-orbit speed is lower because v = sqrt(GM/r) decreases as radius increases.

Detailed marking criteria

Part a (1 mark)

Converts the altitude to an orbital radius of 6.77 × 10^6 m.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part a (1 mark)

Calculates the field strength as 8.69 N kg^-1.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part b (1 mark)

Equates gravitational and centripetal acceleration to obtain orbital speed.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part b (1 mark)

Calculates an orbital speed of 7.67 × 10^3 m s^-1.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part b (1 mark)

Calculates a period of 5.55 × 10^3 s or 92.5 minutes.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part c (1 mark)

Distinguishes constant speed from changing velocity direction.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part c (1 mark)

Identifies gravity as the inward centripetal interaction.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part d (1 mark)

States that gravitational potential energy increases in the higher orbit.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part d (2 marks)

States and justifies that the final circular-orbit speed is lower.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Question 17

(a) The laws of physics have the same form in every inertial frame, and the speed of light in vacuum has the same value c for every inertial observer regardless of source or observer motion.

(b) gamma = 1/sqrt(1 - 0.980^2) = 5.03. Therefore t = gamma t0 = 11.1 microseconds.

(c) The relativistic mean distance is 0.980c(11.1 microseconds) = 3.26 km. The Newtonian estimate is 0.980c(2.20 microseconds) = 0.647 km.

(d) Without time dilation, far fewer muons should survive the atmospheric path. A survival rate consistent with the dilated laboratory lifetime and inconsistent with the Newtonian prediction supports the relativistic model.

Detailed marking criteria

Part a (1 mark)

States the equivalence of the laws of physics in all inertial frames.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part a (1 mark)

States the invariant vacuum speed of light for inertial observers.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part b (1 mark)

Calculates a Lorentz factor of approximately 5.03.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part b (1 mark)

Calculates the laboratory lifetime as approximately 11.1 microseconds.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part c (1 mark)

Calculates a relativistic mean distance of approximately 3.26 km.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part c (1 mark)

Calculates a Newtonian estimate of approximately 0.647 km.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part c (1 mark)

Makes the required comparison between the two distances.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part d (1 mark)

Links the Newtonian lifetime with a much smaller predicted survival distance.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part d (2 marks)

Uses agreement between observed survival and time-dilation prediction as evidence for special relativity.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Question 18

(a) Einstein's equation is E_k,max = hf - W. Therefore E_k,max is the dependent variable and frequency is the independent variable; the graph should be linear with gradient h and negative intercept -W.

(b) The gradient is (1.519 - 0.277)/(3.00 × 10^14) = 4.14 × 10^-15 eV s. Multiplying by 1.60 × 10^-19 J eV^-1 gives 6.62 × 10^-34 J s.

(c) Using any point, W = hf - E_k = 2.00 eV. The threshold frequency is W/h = 4.83 × 10^14 Hz.

(d) Maximum kinetic energy remains 1.105 eV because photon energy is unchanged. Photocurrent increases because more photons, and hence more emitted electrons, arrive per second.

(e) A contact-potential or voltmeter zero offset shifts all stopping-potential values and therefore biases the intercept. Measure the zero response with no accelerating light or use a reference metal, then subtract the signed offset.

Detailed marking criteria

Part a (1 mark)

Identifies frequency as the independent variable and kinetic energy as dependent.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part a (1 mark)

Predicts a linear relationship from the photoelectric equation.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part a (1 mark)

Identifies the gradient as Planck's constant and the intercept as negative work function.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part b (1 mark)

Uses two well-separated points to obtain the graph gradient.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part b (1 mark)

Handles the 10^14 frequency scale to obtain 4.14 × 10^-15 eV s.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part b (2 marks)

Converts the gradient to approximately 6.62 × 10^-34 J s.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part c (2 marks)

Determines the work function as approximately 2.00 eV.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part c (2 marks)

Calculates or extrapolates the threshold frequency as approximately 4.83 × 10^14 Hz.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part d (1 mark)

Predicts unchanged maximum kinetic energy at fixed frequency.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part d (1 mark)

Predicts increased photocurrent from the greater photon arrival rate.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part d (2 marks)

Justifies both predictions using the one-photon-one-electron model.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part e (1 mark)

Identifies a plausible systematic offset affecting every energy measurement.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part e (1 mark)

Explains that the offset biases the intercept and inferred work function.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part e (1 mark)

Proposes a relevant reference, zero check or signed correction.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part e (2 marks)

Explains how the proposed check distinguishes systematic bias from random scatter.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Question 19

(a) Hypothesis: for fixed field and perpendicular active length, force is directly proportional to current. Independent: current. Dependent: force. Controls include active wire length, wire angle, field position/strength and balance orientation.

(b) Zero the balance with current off; centre the same measured wire length in the field; increase current through several measured values; wait for a stable reading; record signed force; reverse current to check direction; repeat and average. Limit current-on time because the wire can heat.

(c) The best-fit gradient is about 0.0120 N A^-1. Since gradient = Bl for a perpendicular wire, B = 0.0120/0.150 = 0.0800 T.

(d) The force increases linearly with current, the points lie close to a straight line and the intercept is near zero. The evidence supports direct proportionality within the measurement scatter.

(e) The field may be non-uniform across the wire, so a single B value is an average. Map B along the active length with a calibrated Hall probe and use only a central uniform region, or integrate the measured field profile.

Detailed marking criteria

Part a (1 mark)

States a directional hypothesis that force is proportional to current.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part a (1 mark)

Correctly identifies current as independent and force as dependent.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part a (2 marks)

Identifies two relevant controlled variables for the magnetic-force test.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part b (1 mark)

Includes zeroing and a consistent active wire position and length.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part b (1 mark)

Uses measured current values and stable signed force readings.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part b (1 mark)

Includes repeats and averaging across an adequate current range.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part b (1 mark)

Uses current reversal or an equivalent direction check.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part b (1 mark)

Controls wire heating with a justified electrical-safety precaution.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part c (1 mark)

Determines a best-fit gradient near 0.0120 N A^-1.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part c (1 mark)

Relates the gradient to magnetic flux density multiplied by active length.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part c (2 marks)

Calculates the magnetic flux density as approximately 0.0800 T.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part d (1 mark)

Uses the approximately constant force-current ratio or straight-line trend.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part d (1 mark)

Uses the near-zero intercept as evidence for proportionality.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part d (1 mark)

Qualifies the conclusion with measurement scatter or uncertainty.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part e (1 mark)

Identifies field non-uniformity or another context-specific limitation.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part e (1 mark)

Explains how the limitation biases or broadens the inferred field value.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part e (1 mark)

Proposes a feasible measurement or control improvement.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part e (1 mark)

Justifies how the improvement increases validity rather than only adding repeats.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Question 20

(a) For a positive charge, v cross B points upward. The force remains perpendicular to velocity, so it changes direction without doing work and produces a circular path while the proton remains in the field.

(b) r = mv/(qB) = 0.196 m. F = qvB = 1.92 × 10^-12 N.

(c) K = 0.5mv^2 = 1.88 × 10^-13 J = 1.17 × 10^6 eV. Since v = 0.050c and gamma is approximately 1.001, the Newtonian result is an appropriate approximation.

(d) Greater collision energy can create short-lived particles and expose rare interactions predicted by the Standard Model. Multiple detectors and independent analysis groups check calibration, background modelling and statistical significance, reducing the chance that an instrument effect or analysis choice is mistaken for new physics.

(e) A local accelerator could train researchers, test detectors and produce short-lived isotopes without long transport delays, improving research capability and potentially patient access. The case depends on demonstrated demand, realistic operating uptime and collaboration rather than duplicating existing facilities. Capital and staffing costs, electricity use, shielding, activation products, radioactive targets and equitable allocation of public funds require whole-of-life assessment. A staged decision should compare audited demand and transport-loss data, dose and waste modelling, independent safety review, community consultation and alternative partnerships. Proceeding is justified only if those data show benefits that exceed the financial and radiological risks under enforceable governance and monitoring.

Detailed marking criteria

Part a (1 mark)

Uses the positive-charge right-hand rule to identify the initial upward force.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part a (1 mark)

States that magnetic force remains perpendicular to velocity.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part a (2 marks)

Explains why the perpendicular force produces circular motion without changing speed.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part b (1 mark)

Equates magnetic force with the required centripetal force.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part b (2 marks)

Calculates an orbit radius of approximately 0.196 m.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part b (1 mark)

Calculates the magnetic-force magnitude as 1.92 × 10^-12 N.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part c (2 marks)

Calculates the kinetic energy as approximately 1.88 × 10^-13 J.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part c (1 mark)

Converts the energy to approximately 1.17 MeV.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part c (1 mark)

Compares the speed with c or evaluates gamma to justify the approximation.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part d (1 mark)

Links higher collision energy with production or detection of short-lived particles.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part d (1 mark)

Links observed interaction rates or products with Standard Model predictions.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part d (1 mark)

Explains a role for detector calibration or background modelling.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part d (1 mark)

Explains how independent replication and analysis strengthen the evidential claim.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part e (1 mark)

Explains a concrete research or workforce-development benefit.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part e (1 mark)

Explains a medical-isotope, transport-time or patient-access benefit.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part e (1 mark)

Identifies capital, staffing or opportunity cost.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part e (1 mark)

Identifies a radiation, activation-product or waste-management risk.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part e (1 mark)

Considers energy use, environmental effect, equity or another wider community constraint.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part e (1 mark)

Specifies relevant local demand, reliability or alternative-facility evidence.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part e (1 mark)

Requires independent safety assessment, monitoring or transparent governance.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part e (1 mark)

Weighs the identified benefits against at least two limitations.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Part e (1 mark)

Gives a conditional, evidence-based recommendation consistent with the evaluation.

Acceptable alternatives: Accept equivalent scientifically accurate reasoning or working applied to the supplied context.

Diagnostic Checklist

TopicQuestionsMarksMarks LostAction
Electric and magnetic fields Q12, Q14, Q2, Q20, Q3 12 ___ Review electric and magnetic fields, force directions, current-produced fields and electromagnetic waves.
Electromagnetic induction Q11, Q4 2 ___ Review flux, Faraday and Lenz laws, generators, motors and ideal transformers.
Gravity and motion Q1, Q15, Q16 12 ___ Review gravitational fields, projectile and circular motion, orbital relationships and energy transfer.
Quantum theory Q18, Q6, Q7 10 ___ Review photons, black-body radiation, the photoelectric effect, atomic spectra and matter waves.
Science as a Human Endeavour Q10, Q20 10 ___ Review model development, collaboration, benefits, risks and evidence-informed public decisions.
Science inquiry skills Q18, Q19, Q9 33 ___ Review experimental design, data representation, uncertainty, validity and evidence-based conclusions.
Special relativity Q13, Q17, Q20, Q5 16 ___ Review inertial frames, the two postulates, relativistic measurements, momentum and mass-energy equivalence.
The Standard Model Q20, Q8 5 ___ Review particles, gauge bosons, quark composition, conservation laws and accelerator evidence.

What is included

Integrated practice assessment questions (100 marks)

Links to the current official examination resources supplied separately by the assessment authority

Worked solutions and marking guidance shown online

Diagnostic checklist shown online

Free browser viewing with no checkout

No PDF or downloadable file

How to use this pack

  1. Attempt: Open the complete paper online and work under the timing and conditions shown on this page.
  2. Mark: Use the supplied worked solutions or response support and marking guidance to check answers and method.
  3. Review: Use the supplied diagnostic or review support to identify the next areas for revision.

Is this pack right for you?

Designed for

Students, parents, teachers and tutors who want to inspect a complete online ACT BSSS Physics T example before choosing a released PDF pack.

Product at a glance

  • ACT BSSS Physics T
  • 2026 edition · Pack 0 · v2.0
  • 1 online paper
  • Free online view · no checkout or PDF download
  • Free to view online
  • No monthly Online Practice subscription required

Compare before buying

Pack 0 is the free online showcase for this course. Other pack numbers identify separate original products; they do not indicate difficulty or a required order.

Official examination resources

Open these current official resources alongside the Skill Align paper. They remain hosted and controlled by the assessment authority and are not republished by Skill Align.

Current ACT BSSS Physics T course document Official curriculum reference, not a prescribed examination formula sheet. Opens on the ACT BSSS website.

Questions about this exam pack

What is included in Physics Free Online - Pack 0?

Pack 0 includes one full-length showcase paper, worked solutions, marking guidance and diagnostic checklists, all shown online.

Is Pack 0 really free?

Yes. Pack 0 can be read online without checkout or a monthly subscription.

What does Pack 0 mean?

Pack 0 identifies the free online showcase for this course. Other pack numbers identify separate original products; they do not indicate difficulty or a required completion order.

Can I download Pack 0 as a PDF?

No. Pack 0 is intentionally online-only and no downloadable PDF is provided.

Are these official assessment authority examination questions?

No. The questions are original Skill Align material. Skill Align is independent and is not affiliated with, authorised by, sponsored by, approved by, or endorsed by any state assessment authority.

Independent practice resource

ACT BSSS courses and senior secondary assessment are administered by the ACT Board of Senior Secondary Studies. Skill Align is an independent publisher and is not affiliated with, authorised by, sponsored by, approved by, or endorsed by ACT BSSS or the ACT Government. ACT BSSS packs are original Skill Align practice assessment resources, not official ACT BSSS subject examinations.

Each exam pack is listed with a pack label so buyers can distinguish separate original products in the same course series. Pack numbers do not indicate difficulty or a required completion order.

2026 exam timetable reference View ACT BSSS assessment system

ACT BSSS has no external subject-based examinations. Your college sets its own course assessment times; the ACT Scaling Test is separate from these practice packs.