IMAT physics (Fizik: Mekanik, Elektrik & Optik) accounts for 13 of the 60 questions on the 100-minute İtalya Tıp Fakültesi entrance examination, and sits inside Section 2 alongside biology, chemistry and a small mathematics slice. The mark weight of the science section is, in practice, what decides an admissible score, and within science, physics is the strand where Turkish-origin candidates most often leave marks on the table. The reason is not difficulty. The 13 stems are not unusually hard in absolute terms. The reason is that physics questions test a layered skill that biology and chemistry do not: the ability to read a diagram, translate a real-world arrangement into symbols, choose the right governing equation, and resolve it with a calculator you are not allowed to use. That four-step chain breaks at the first link more often than students realise. This article walks through how to read these 13 stems in a way that protects the chain, how to triage mechanics versus electricity versus optics, and where the predictable loss-of-mark traps sit in each sub-domain.
Why the 13-question slice behaves like three mini-sections
Mechanics, electricity and optics are not interchangeable on the paper. Each sub-domain has a distinct question grammar, a distinct diagram type, and a distinct calculator-free arithmetic pattern. Treating the 13 physics items as a single homogeneous block is the first strategic mistake I see in most self-study plans. A candidate who burns 90 seconds on a pulley problem will not have those 90 seconds for an optics lens-drawing item, even if the optics item is, in isolation, easier. The triage is built into the syllabus: roughly 4–5 mechanics questions, 4–5 electricity questions, and 3–4 optics questions on a typical paper, with small variation from year to year. That ratio is the single most useful number to internalise before you ever open a textbook, because it tells you how to slice your revision time and how to pace the section in the live exam.
The grammar difference matters too. Mechanics stems tend to read as a scenario — a block on an inclined plane, a car braking to a stop, a spring compressed by a mass — followed by a 'find the value of X' question that resolves in two or three substitution steps. Electricity stems lean on circuit diagrams with labelled resistors, switches and cells, and the answer usually hinges on a series-parallel reduction or on the relationship between V, I and R in some configuration. Optics items are nearly always diagram-based: a ray entering a prism, a lens forming an image of an object, a mirror with focal length marked. If you can sketch the diagram cleanly in the first 20 seconds of reading, the rest of the problem often falls into place. Candidates who try to read optics as text alone lose the visual anchor and guess.
Three sub-domains, three pre-drill priorities
- Mechanics: kinematics equations, Newton's second law in vector form, work–energy theorem, momentum conservation, circular motion basics, Hooke's law for springs, simple harmonic motion period formula.
- Electricity: Ohm's law in series and parallel combinations, the power equations P = VI = I²R = V²/R, Kirchhoff's voltage and current laws, the behaviour of capacitors in DC steady state, and resistor-capacitor charge curves at a qualitative level.
- Optics: the thin lens equation 1/f = 1/do + 1/di, the mirror equation in identical form, Snell's law for refraction, total internal reflection, and the rules for ray tracing through converging and diverging elements.
Notice that every formula in that list can be evaluated with whole-number arithmetic. The exam writers know calculators are banned, and the numbers are chosen to make mental arithmetic painless once the right equation is identified. The trap is choosing the wrong equation, not multiplying the right numbers.
Reading an IMAT physics stem in three passes
The single most useful habit I coach on this section is a strict three-pass reading of every stem, regardless of how easy it looks on first glance. Most candidates read a physics question once, locate a number, plug it into the first formula they remember, and commit. On IMAT, that approach burns items that should be free. The three-pass method is slower by about 12 seconds per question, which over 13 questions costs you roughly 2.5 minutes — an acceptable trade for the 3–4 marks it protects.
Pass 1 (10–15 seconds): diagram-first inventory. Open the question, do not read the prose. Go straight to the diagram, draw it again in the margin if one is provided, sketch it from the text if not. Mark every labelled length, angle, force, voltage and resistance directly on your own sketch. The act of redrawing forces you to notice labels that the original image hides in clutter. If the diagram is a circuit, count the nodes and identify whether resistors are in series or parallel at a glance. If the diagram is a lens or mirror, draw the principal axis, the object arrow, and the focal points. By the end of pass 1, you should have a clean, complete picture of the physical setup independent of the words.
Pass 2 (15–20 seconds): variable isolation. Now read the prose once, slowly. Identify what is given and what is asked. Write the target variable at the top of your rough work in symbolic form — for example, v = ?, Req = ?, image distance = ?. This sounds trivial, but it prevents the most common loss pattern on IMAT physics: solving for the wrong quantity. A great number of past papers contain distractors that match the value of an intermediate step rather than the final answer. Candidates who solve symbolically and only substitute at the end are protected from that pattern.
Pass 3 (15–25 seconds): equation selection and mental arithmetic. Choose the single governing equation. Check units to confirm the equation applies (more on this in the next section). Substitute the values, keeping one decimal place of precision at most. The numbers in IMAT physics are almost always chosen so that intermediate steps round cleanly. If you find yourself with a 7.83 or a 0.417, you have probably chosen the wrong equation. Back out and reconsider.
A worked example across the three passes
Consider a stem: 'A 4 kg block slides down a frictionless plane inclined at 30° to the horizontal. What is the block's speed after it has descended a vertical distance of 5 m, starting from rest?' Pass 1: draw the incline, mark the 30° angle, the block on the slope, the 5 m vertical drop as a dashed line. Pass 2: write v = ? at the top of the rough work. Note that the inclined distance is not needed — only the vertical drop enters the energy equation. Pass 3: choose the work–energy theorem, ½mv² = mgh, cancel m, compute v = √(2 × 10 × 5) = √100 = 10 m/s. Twenty seconds of work, two equations considered, one chosen, and the answer is exact. The student who reaches for the kinematics chain v² = u² + 2as has to compute the distance along the incline, multiply by the sine of the angle, and lives with a higher error rate.
The unit-blindness trap on calculator-free physics
On IMAT, you cannot punch numbers into a device. The arithmetic must be done in your head or on paper. The exam writers exploit this by setting up questions where the answer is determined not by the calculation but by the unit of the result. The question is often a multiple-choice stem where three of the four options have the wrong unit and one has the right one. Candidates who substitute into a formula and reach a numerical value without checking the unit lose the question to a student who simply matched units. This is what I mean by unit blindness: trusting the number, ignoring the dimension.
Take a typical electricity item: 'A circuit contains a 12 V battery connected to two resistors of 6 Ω in series. What is the power dissipated in the resistor pair?' The naive solver finds the current I = V/R = 12/12 = 1 A and the power P = VI = 12 × 1 = 12 W. The careful solver notes that P must be in watts, that V × I gives watts only when V is in volts and I is in amperes, and confirms the answer is dimensionally consistent before selecting. A second stem from the same paper might ask: 'What is the total charge that flows through the battery in 5 seconds?' The naive solver might again reach 1 A and multiply by 5 s to get 5, but the correct unit is the coulomb, and the trap option 5 W is offered to the student who forgot to multiply by time.
How to train the unit check
- For every equation you revise, write down the units of the left-hand side and the right-hand side explicitly. They must match. If they do not match, you have either the wrong equation or a missing constant.
- For every worked example you solve, finish the problem by writing the unit of the answer beside the number. A habit of writing '12 W' rather than '12' takes two seconds and prevents 30-second rework.
- When you are stuck between two options on a live exam, eliminate the option with the wrong unit first. You will often find that the unit check alone resolves the ambiguity, without further arithmetic.
The unit check is especially powerful in optics. Refractive index is dimensionless, focal length is in metres, magnification is dimensionless, the critical angle is in degrees. A stem asking for the critical angle with options 0.5, 1.33, 48.6 and 90 — the student who remembers the unit of an angle narrows the choice instantly to 48.6 and 90, and the geometry of the setup eliminates one of those two.
Mechanics: the high-yield equation cluster
Within the 4–5 mechanics questions that typically appear, the highest-yield equations are a tight cluster. Candidates who memorise this cluster in symbolic form and can convert a stem into the cluster without hesitation will clear the mechanics items reliably. The cluster, in priority order:
- Kinematics: v = u + at; s = ut + ½at²; v² = u² + 2as. These three cover every constant-acceleration problem on the paper.
- Newton's second law: F = ma, used in component form along the slope or along the string.
- Work–energy theorem: W = ΔKE = ½m(v² − u²).
- Momentum conservation: m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂, used in collision problems and in rocket-thrust items at an introductory level.
- Hooke's law: F = kx, used for spring compression and simple harmonic motion period T = 2π√(m/k).
- Circular motion: centripetal force F = mv²/r, and the period of circular motion T = 2πr/v.
Of these, the work–energy theorem is the most under-used. Candidates default to the kinematics chain even when a problem does not give time. If the stem does not mention time, do not reach for the kinematics chain. Reach for energy instead. The classic inclined-plane problem above is solved in three substitutions using work–energy and would take six substitutions via kinematics. Speed of resolution translates directly to marks on a 100-minute paper.
Common pitfalls in mechanics and how to avoid them
- Mixing up static and kinetic friction. IMAT will sometimes give a coefficient of static friction and ask whether the block moves. Compute the maximum static friction and compare with the applied force. Do not assume the block moves.
- Forgetting g. The acceleration due to gravity is 9.8 m/s² or 10 m/s² depending on the stem. Read the stem for the chosen value. If no value is given, use 9.8.
- Sign errors on vector components. When breaking weight into components along and perpendicular to an incline, the component along the slope is mg sin θ, and the perpendicular component is mg cos θ. Candidates who reverse these silently introduce a sign error that propagates through the rest of the question.
- Ignoring air resistance cues. If the stem says 'negligible air resistance', treat the projectile as ideal. If it does not, the problem is unsolvable with the basic equations — flag and skip.
Electricity: circuit reduction as the core skill
The 4–5 electricity questions on a typical paper reduce to a single skill: take a circuit diagram, simplify it to an equivalent resistance, then compute either current, voltage drop, or power. Candidates who freeze on circuit diagrams almost always do so because they are trying to apply Kirchhoff's laws to a network that is, in fact, reducible by inspection. The reduction sequence to drill is: identify parallel branches and replace with a single equivalent, identify series resistors and sum them, repeat until a single loop remains. At that point, Ohm's law gives the current in the loop, and you work back outward to find branch currents and voltage drops.
Capacitor items appear occasionally and follow a different logic. A capacitor in DC steady state is an open circuit, which means no current flows through its branch in the long-time limit. This single rule resolves a surprising number of seemingly complex circuits. For a charging capacitor, the voltage across the capacitor grows from zero to the supply voltage according to an exponential curve, and the time constant τ = RC determines the speed. IMAT rarely asks for a numerical value of τ; it usually asks a qualitative question — for example, 'after a time equal to one time constant, the capacitor is charged to what fraction of the supply voltage?' The answer is roughly 63%, and it follows from the exponential form.
A compact reference table for electricity items
| Quantity | Equation | Unit | Typical trap |
|---|---|---|---|
| Equivalent resistance, two resistors in series | R_eq = R₁ + R₂ | Ω | Adding instead of reciprocating when parallel |
| Equivalent resistance, two resistors in parallel | 1/R_eq = 1/R₁ + 1/R₂ | Ω | Forgetting that parallel R is always less than the smaller R |
| Power dissipated in a resistor | P = VI = I²R = V²/R | W | Mixing V and I from different branches |
| Charge stored in a capacitor | Q = CV | C | Using C in μF without converting to F |
| Energy stored in a capacitor | E = ½CV² | J | Forgetting the factor of ½ |
| Time constant of an RC circuit | τ = RC | s | Confusing τ with period T |
That table covers roughly 80% of the electricity items that have appeared in the last several administrations. Drill it until the equations and units are automatic, and the electricity slice will cost you under four minutes total on exam day.
Optics: the diagram does the maths
Optics is the sub-domain where diagram literacy matters most. The 3–4 optics items on a typical paper are almost always accompanied by a clear diagram: a ray entering a glass slab at a labelled angle, a lens with focal length marked, a mirror with object distance indicated. Candidates who try to solve optics by reading the prose alone consistently under-perform. The right entry point is the sketch, not the text. Redraw the diagram, mark all known angles and distances, identify whether the optical element is converging or diverging, and then apply the relevant law.
For lenses and mirrors, the thin lens equation 1/f = 1/do + 1/di is the workhorse. Two of the three quantities are given, the third is the unknown, and the arithmetic is a single reciprocal sum. The trap is the sign convention: for a converging lens, the focal length is positive and the image distance is positive for a real image. For a diverging lens, the focal length is negative. The candidate who keeps the convention consistent avoids a whole class of errors. Magnification m = −di/do gives image orientation (positive m means upright, negative means inverted), which is a useful sanity check on the answer.
For refraction, Snell's law n₁ sin θ₁ = n₂ sin θ₂ is the only equation needed. The two refractive indices are typically given (1.00 for air, 1.50 for glass, 1.33 for water), the angle of incidence is read from the diagram, and the angle of refraction follows. Total internal reflection occurs when the angle of refraction would exceed 90°, which gives a critical angle θc = sin⁻¹(n₂/n₁). A common stem asks whether a ray at a given angle will exit a glass block or be totally reflected — the calculation is one sin⁻¹ evaluation.
Optics-specific reading strategy
- Sketch first, read second. Open the diagram, label every angle, every focal point, every object distance. Then read the prose once to confirm what is being asked.
- Check the sign of f before substituting. Converging elements have positive f; diverging elements have negative f. A single sign slip inverts the answer.
- Verify the answer against image-orientation intuition. If the object is beyond the focal point of a converging lens, the image is real and inverted. If the calculation gives an upright real image, something is wrong.
- For total internal reflection, check the direction of travel. Light going from glass to air can be totally reflected; light going from air to glass cannot, regardless of the angle.
Time budgeting across the 13 physics items
The 100-minute paper contains 60 questions, which gives an average of 100 seconds per question if you spend time evenly. The 13 physics items, on a balanced split, deserve roughly 22 minutes — about 100 seconds per item. In practice, the optimal distribution is not even. Optics and mechanics items often resolve in 60–80 seconds once the diagram is drawn. Electricity items involving circuit reduction can take 90–120 seconds because the reduction itself is multi-step. The right approach is to triage on first read: any item you cannot start within 30 seconds should be flagged, not abandoned, and returned to after the 22-minute window expires.
Time budgeting also means reserving mental energy. The 13 physics items should not be the first 13 questions you attempt. Most candidates will tackle biology or chemistry first because those items feel more familiar. By the time you reach physics, your reading speed and pattern recognition are warmed up. If you are a confident physics student, the reverse order is also valid. The point is to choose deliberately rather than answering in paper order.
A pacing drill for the 22-minute window
Practise the following sequence in timed conditions before exam day. Set a timer for 22 minutes, take a 13-question physics mock from a past paper, and enforce the three-pass method on every item. After the first attempt, review which items breached 120 seconds and which resolved under 60. The pattern that emerges tells you which sub-domain to drill harder. Repeat the drill weekly for four weeks, and the median resolution time will drop by 15–25 seconds per item. Over 13 items, that recovers roughly four minutes — enough to give one extra minute each to four biology or chemistry items, which is a meaningful score swing.
Synthesis: the 13-item physics routine
Pulling the threads together, the routine I recommend for the 13 IMAT physics items looks like this. Begin the section by glancing at the first two items, identifying the sub-domain of each (mechanics, electricity, optics), and triaging: solve the items you can start in under 30 seconds, flag the rest. Redraw every diagram before reading the prose in full. For each item, isolate the target variable symbolically, choose the single governing equation, check that the units match, and substitute. If a substitution produces a numerical value with the wrong unit, back out and reconsider. Reserve a two-minute buffer at the end of the 22-minute window to revisit flagged items.
This routine is not theoretical. Candidates who adopt it typically clear 10–12 of the 13 physics items with confidence, recover most of the marks on the remaining 1–3 through the revisit, and free up 4–6 minutes that would otherwise have been lost to rework. Over the whole paper, those recovered minutes translate to 4–6 extra items attempted, which in turn translate to 4–6 extra marks — a substantial swing on the 60-item paper.
Common pitfalls and how to avoid them
- Reading the prose before drawing the diagram. You will lock onto a number that is not the one you need. Always sketch first.
- Substituting into the first formula you remember. Force yourself to consider two candidate equations, then choose. The five seconds of doubt saves two minutes of rework.
- Skipping the unit check. Write the unit beside every numerical answer. The habit is what catches the dimensionally inconsistent option.
- Spending three minutes on a single item. Time-box every item at 120 seconds. If you are not making progress, flag and return.
- Confusing series and parallel reductions in circuits. Memorise the rule: same current through both resistors = series; same voltage across both = parallel. Apply the rule before you start computing.
Conclusion and next steps
The 13 IMAT physics items on mechanics, electricity and optics are a tractable sub-section once the right reading routine is in place. The three-pass method, the unit check, and the diagram-first habit together convert most of the stem's ambiguity into a clean one-equation problem. With weekly 22-minute pacing drills and a tight revision of the high-yield equation cluster, the section can reliably cost under 25 minutes and yield 10–12 confident answers. The next step is to audit your own current physics timing against the 22-minute benchmark and identify which of the three sub-domains most often breaches 120 seconds per item — that is the slice of the syllabus to drill first. TestPrep İstanbul's diagnostic assessment on the mechanics–electricity–optics split is a natural starting point for candidates building a sharper preparation plan around the 13-item physics routine.