- TX PACT 739 has five domains and 14 competencies; Mechanics is the largest at 28% of the exam.
- Electricity and Magnetism (22%) questions use conventional current and assume the right-hand rule.
- Modern Physics (22%) includes thermal energy and thermodynamics, not just quantum topics.
- You get 125 selected-response questions in 3 hours 45 minutes, with a scaled passing score of 240.
Overview of the TX PACT 739 Framework
TX PACT: Physics: Grades 7-12 (739) is organized by the Texas Education Agency (TEA) into five domains and 14 competencies, administered on computer by Pearson through Pearson VUE test centers. Unlike many licensure exams that spread content evenly, TX PACT 739 concentrates nearly half of the exam in two domains: Mechanics and Modern Physics, with Electricity and Magnetism close behind. Understanding this lopsided weighting is the single most important strategic insight for anyone preparing for this exam.
Each domain weight below is approximate, as stated in the official framework, but the rank order - Mechanics first, then Electricity and Magnetism and Modern Physics tied, then Nature of Science and Waves - should drive how you allocate study time. This guide breaks down what each domain actually tests, using the competency structure and reference materials TEA and Pearson publish, so you know exactly what to master before test day.
Domain 1: Nature of Science (14%)
Nature of Science
This domain tests how well you understand physics as a discipline: the process of scientific inquiry, measurement, experimental design, and the history and philosophy of scientific thought as applied to physics classrooms.
- Scientific method, hypothesis formation, and experimental controls
- Measurement systems, significant figures, unit conversion, and error analysis
- Lab safety procedures and appropriate use of equipment in a 7-12 classroom
- The role of models, theories, and laws in physics, and how scientific consensus evolves
Because Nature of Science sits at 14%, it's tempting to deprioritize it, but its questions tend to be conceptual rather than computational, meaning strong reading comprehension and familiarity with scientific reasoning can bank points quickly. If you're building a broader review plan, the TX PACT 739 Study Guide 2026 walks through how to sequence this domain relative to the heavier content areas.
Domain 2: Mechanics (28%)
Mechanics
As the single largest domain on the exam, Mechanics anchors the test. Expect a mix of conceptual and calculation-based questions covering motion, forces, energy, and rotational systems.
- Kinematics in one and two dimensions, including projectile motion
- Newton's laws of motion and force diagrams
- Work, energy, and power, including conservation of energy problems
- Momentum, impulse, and collisions (elastic and inelastic)
- Circular motion, torque, and rotational dynamics
- Gravitation and orbital mechanics
Given that Mechanics represents 28% of the framework - more than double the weight of Nature of Science or Waves - it deserves the largest single block of your preparation calendar. Candidates who underestimate the computational depth here (multi-step problems combining kinematics with energy conservation, for instance) often find their pacing thrown off during the actual 3 hour 45 minute testing window. Reviewing worked problems against the on-screen Constants and Formulas reference ahead of time helps you recognize which formulas are provided and which you'll need to have memorized.
Key Takeaway
Spend your first and heaviest study block on Mechanics. Because it carries the largest weight of any domain, gains here move your overall score more than equivalent time spent on smaller domains.
Domain 3: Electricity and Magnetism (22%)
Electricity and Magnetism
This domain covers electrostatics, circuits, and magnetic phenomena - and it comes with a specific convention you must apply consistently.
- Electric charge, Coulomb's law, and electric fields
- Circuit analysis: series, parallel, Ohm's law, and power dissipation
- Magnetic fields, magnetic forces on moving charges, and electromagnetic induction
- Conventional current direction and the right-hand rule for determining field and force directions
A critical, exam-specific detail: TX PACT 739 electricity and magnetism questions use conventional current (not electron flow) and assume you'll apply the right-hand rule to determine directions for magnetic force and field problems. If you learned electron-flow conventions in a prior course, this is one of the most important adjustments to make before test day - misapplying current direction will produce the wrong answer even if your underlying physics reasoning is sound. This domain is weighted equally with Modern Physics at 22%, making it the second-highest priority behind Mechanics.
Domain 4: Waves (14%)
Waves
Waves is tied with Nature of Science as the lowest-weighted domain, but it still spans a meaningful range of topics across mechanical and light-based wave phenomena.
- Wave properties: wavelength, frequency, amplitude, and wave speed relationships
- Sound waves, resonance, and the Doppler effect
- Reflection, refraction, diffraction, and interference
- Basic optics: mirrors, lenses, and image formation
Because Waves accounts for only 14% of the exam, it's an efficient domain to review in a single focused pass rather than spreading it across multiple sessions. Many candidates find that Waves problems reuse mathematical patterns from Mechanics (periodic motion, ratios, and rate relationships), so tackling Mechanics first can make Waves review faster.
Domain 5: Modern Physics (22%)
Modern Physics
Modern Physics is tied with Electricity and Magnetism for second-highest weight, and its scope is broader than the name suggests - it explicitly includes thermal energy and thermodynamics alongside more traditional "modern" topics.
- Thermal energy, heat transfer, and the laws of thermodynamics
- Atomic structure and models of the atom
- Nuclear physics: radioactive decay, half-life, fission, and fusion
- Quantum concepts: photoelectric effect and wave-particle duality
- Special relativity basics as they apply to a 7-12 physics curriculum
Because Modern Physics folds thermodynamics into its scope, candidates who mentally file heat and thermal energy under "Mechanics" risk under-preparing this domain. At 22% of the exam, Modern Physics deserves study time nearly on par with Electricity and Magnetism - don't let the "modern" label make you assume it's a small, niche section.
Key Takeaway
Modern Physics is not just quantum mechanics and relativity - thermal energy and thermodynamics are explicitly part of this 22% domain, so review heat, entropy, and energy transfer alongside nuclear and atomic topics.
Turning Domain Weights Into a Study Plan
With approximate weights of Mechanics 28%, Electricity and Magnetism 22%, Modern Physics 22%, Nature of Science 14%, and Waves 14%, a reasonable study calendar allocates time roughly in that order rather than treating all five domains equally.
| Domain | Approx. Weight | Relative Priority |
|---|---|---|
| Mechanics | 28% | Highest - largest single block |
| Electricity and Magnetism | 22% | High - watch conventional current rule |
| Modern Physics | 22% | High - includes thermodynamics |
| Nature of Science | 14% | Moderate - conceptual, efficient to review |
| Waves | 14% | Moderate - overlaps with Mechanics math |
Mechanics Deep Dive
- Kinematics, forces, energy, momentum, and rotational motion problem sets
- Practice pacing multi-step calculations within the timed format
Electricity and Magnetism
- Circuit analysis drills and magnetic force problems using the right-hand rule
- Review conventional current direction until it's automatic
Modern Physics
- Thermodynamics and heat transfer alongside atomic and nuclear topics
- Quantum concepts and basic relativity as they apply to a 7-12 curriculum
Nature of Science and Waves
- Conceptual review of scientific inquiry and measurement
- Wave properties, optics, and sound, tying back to Mechanics math patterns
For a more detailed week-by-week breakdown with resource recommendations, see the TX PACT 739 Study Guide 2026. If you're still weighing how difficult this exam is relative to your background, How Hard Is the TX PACT 739 Exam? breaks down the difficulty factors domain by domain.
How the 125 Questions Are Actually Delivered
TX PACT 739 is a computer-administered exam consisting of 125 selected-response questions, and unscored field-test items may be embedded among them - meaning you won't know which questions count toward your score, so every item deserves full attention. Total testing time is 3 hours 45 minutes, within a 4-hour appointment that also includes 15 minutes for the tutorial and compliance agreement. The passing scaled score is 240.
An on-screen scientific calculator and a Constants and Formulas reference sheet are provided during the exam, which helps with domains like Mechanics and Electricity and Magnetism that involve numeric problem-solving. However, the reference does not contain every formula you may need, so memorizing key derived formulas - not just the constants provided - is essential preparation, especially for Modern Physics and Waves calculations that may require you to manipulate given equations. For a full explanation of how the 240 score is calculated and what it means practically, read TX PACT 739 Passing Score 2026.
Retakes require at least 30 days between exam attempts, and prior results must post to ECOS before you can register again; affiliated candidates going through an Educator Preparation Program (EPP) need EPP retest approval as well. Note that PACT taken for EPP admission or charter-school assignment purposes is exempt from the standard five-attempt limit, though intensive pre-service candidates remain subject to it. If you're pursuing the Physics/Mathematics dual route, remember that it requires passing both Physics 739 and Mathematics 735 - plan your domain review calendar for both exams together rather than treating them as fully separate projects.
Also keep in mind that PACT supports program admission decisions and is entirely separate from TExES Physics/Mathematics 243 certification testing - the two serve different purposes in the Texas educator pipeline, and confusing them can lead to registering for the wrong exam. For eligibility specifics - including the GPA and credit-hour thresholds that trigger a PACT requirement - see TX PACT 739 Requirements 2026.
Once you've mapped out your domain priorities, you can reinforce them with realistic practice questions on our practice test platform, which mirrors the selected-response format you'll see on test day. Working through timed sets on the main practice site is one of the most direct ways to confirm your Mechanics and Electricity and Magnetism preparation is solid before your appointment.
FAQ
Start with Mechanics, since it's the largest domain at 28% of the exam. Building strong fundamentals in kinematics, forces, and energy also supports later review of Waves, which shares similar mathematical patterns.
Yes. The Modern Physics domain, weighted at 22%, explicitly includes thermal energy and thermodynamics alongside atomic, nuclear, and quantum topics - don't skip heat transfer and the laws of thermodynamics when reviewing this domain.
Electricity and magnetism questions on TX PACT 739 use conventional current and assume the right-hand rule for determining directions of magnetic force and field, so make sure that's the convention you practice with.
An on-screen scientific calculator and a Constants and Formulas reference are provided, but the reference does not contain every formula you may need, so memorize key derived equations in advance, particularly for Mechanics and Modern Physics.
The exam has 125 selected-response questions total (with possible unscored field-test items), distributed across five domains according to approximate weights, with Mechanics at 28% generating the largest share of items.