25 Physics Project Topics for Class 11 in 2026
Ask a Class 11 student what their physics project is about, and you usually get a noun: optical fibres, Tesla coils, the Doppler effect. Ask what they measured and the conversation stops. A topic becomes a poster; a question becomes an investigation.
The 25 physics project topics for Class 11 below are questions with measurable answers, each with the relevant physics and the full apparatus list, so you can judge in seconds whether it suits your lab, your kitchen table, or your phone.
A working model is not an investigatory project
A working model demonstrates something already known: a hydraulic lift shows Pascal's law, a DC motor spins. An investigatory project measures how far reality departs from the textbook.
The distinction surfaces in the viva. If the examiner asks what you found and your only honest answer is "it worked", you built a demonstration. Crossing that line requires no exotic topic: take a standard experiment, change a variable the syllabus holds constant, and ask how far the prediction misses.
25 physics project topics for class 11
Mechanics, motion and rotation
Units 2 to 5. A phone shooting slow motion does most of the timing work here.
# | Question | Physics used | Apparatus |
|---|---|---|---|
1 | Does a ball's coefficient of restitution change with drop height? | Collisions, energy loss | Ball, scale, slow-motion video |
2 | Is static friction independent of contact area for soft surfaces too? | Laws of friction | Incline, protractor, equal-mass blocks |
3 | Do equal-mass cylinders roll at different rates when mass sits at the rim, not the core? | Moment of inertia | Two tins, sand, washers, incline, video |
4 | By how much does the range-maximising launch angle fall below 45 degrees? | Projectile motion, drag | Spring launcher, tape, video |
5 | Where do a lift's accelerometer trace and spring-balance reading disagree? | Apparent weight | Phone accelerometer, spring balance, mass |
6 | Do plumb-line and balancing methods agree on a lamina's centre of mass? | Centre of mass, torque | Card shapes, thread, plumb bob, pin |
7 | What rolling friction coefficient do four floor surfaces give? | Work-energy theorem | Steel ball, ramp, four surfaces, tape |
Properties of bulk matter
Unit 7: elasticity, fluids and surface tension. The easiest group to get a clean result from, since these laws are tidy enough that a deviation means something.
# | Question | Physics used | Apparatus |
|---|---|---|---|
8 | Does Hooke's law hold for rubber as for steel, and where does it break? | Elasticity, Young's modulus | Wire, rubber bands, weights, scale |
9 | Does capillary rise vary inversely with tube radius? | Surface tension, Jurin's law | Three capillary bores, microscope |
10 | How does detergent concentration change water's surface tension? | Surface tension, capillary rise | Burette, capillary tube, solutions |
11 | How does cooking oil's viscosity change with temperature? | Stokes' law, terminal velocity | Tall jar, small beads, thermometer, marked fall length, stopwatch |
12 | By how much does efflux speed fall short of the root of 2gh? | Torricelli's law | Tank with overflow to hold the head, three hole sizes, ruler |
13 | Does terminal velocity scale with the square of sphere radius? | Viscous drag | Four bearing sizes, glycerine, marked length, stopwatch |
Thermal properties and calorimetry
Also Unit 7, and the cheapest group to run. Here the graphs carry the marks.
# | Question | Physics used | Apparatus |
|---|---|---|---|
14 | Does container colour change the rate at which water cools? | Newton's law of cooling | Identical containers, thermometer, timer |
15 | How far does ignoring the calorimeter's heat capacity shift a specific heat value? | Method of mixtures | Calorimeter, blocks, thermometer, balance |
16 | Which matters more for evaporation rate, surface area or air flow? | Mass-loss rate | Identical dishes, fan, balance, timer |
17 | What does molten wax's cooling curve show about latent heat of fusion? | Latent heat, change of state | Wax, water bath, thermometer, timer |
18 | Does an air gap insulate better than a thicker single wall? | Conduction, convection | Two containers, thermometer, timer |
Oscillations and waves
Unit 10, and the group most likely to hand you a result you did not expect.
# | Question | Physics used | Apparatus |
|---|---|---|---|
19 | At what amplitude does the period deviate beyond your timing uncertainty? | SHM, small-angle limit | Pendulum, protractor, stopwatch, 20-swing counts |
20 | Does frequency vary as one over the root of linear mass density? | Vibrations in strings | Sonometer, three wire gauges, tone generator |
21 | Does the resonance-tube end correction depend on tube diameter? | Resonance in closed pipes | Two tube diameters, tuning forks |
22 | Does a spring's own mass affect its oscillation period? | SHM, effective mass | Springs, weights, stopwatch, balance |
23 | How does bob shape change the decay of a pendulum's amplitude? | Damping, air resistance | Three equal-mass bob shapes, video |
24 | Down to what frequency difference can beats still be heard? | Superposition, beats | Two tone generators, headphones, listeners |
25 | Does sound intensity fall as the inverse square of distance indoors? | Inverse-square law | Sound meter app, tape, corridor and room |
Idea 25 is worth singling out. Indoors, the answer is usually no, because reflected sound keeps arriving from the walls. Measuring that and explaining the reflections beats a graph that looks suspiciously perfect.
Grades 6 to 8 can run ideas 1, 14 and 18 with smaller samples, roughly the level the Young Scholar Program works at.
If you cannot get lab time
Ideas 1, 3, 4, 5 and 23 are the physics project ideas here that need no lab: a phone, free motion-analysis software and a tape cover them, and frame-by-frame video beats a stopwatch for timing.
What goes into the project file?
A file is marked on completeness as much as on findings. Open with the aim as a question, then the hypothesis and its reasoning. List apparatus with least counts, since a stated least count is what makes error analysis credible. Give the theory, the formula, and a procedure detailed enough to repeat. Put observations in a ruled table with units in the heading, then one worked calculation, labelled graphs, percentage error and a result to sensible significant figures. Close with a numerical conclusion, a limitations paragraph and a bibliography. Naming a limitation strengthens a file: it shows you know where your method loses accuracy.
Turning a class 11 project into something publishable
A practical file is closer to a research paper than students assume, but three things have to change: the question must not already be answered in that form, the data must survive a statistical test rather than an eyeball, and the write-up must engage with published literature rather than a textbook.
Several ideas above carry that weight with more data. Idea 11 becomes a viscosity-temperature study with a fitted model; idea 23 a damping study across bob geometries. The topic rarely decides the outcome. What does is whether someone experienced reviews the design before six weeks go into the wrong data, which is what the opening weeks of the High School Scholar Program are built around, while our research project ideas in other subjects show the same upgrade elsewhere.
Budget honestly. Six or seven weeks covers a school project: a week to turn the topic into a question, a week on a pilot run, two or three collecting data, two writing. A research-grade version runs four to six months, most of it design and revision. If publication is the aim, check what a journal accepts before you design the study, which our guide to journals that publish student research sets out. Presenting first is often the better route, and conferences such as ICONSTARS exist for that.
Frequently asked questions
Which physics project topics for class 11 can be finished fastest? Ideas 1, 18 and 25 use household apparatus, give data in one afternoon, and still leave you a real graph to interpret.
Can I reuse the topic for my Class 12 project? Revisit the question, not the file. Class 12 expects a harder analysis and a different unit base, so plan to extend it.
Does an inconclusive result lose marks? An honest negative result with a sound method is still a result, and the limitations section is where you defend it. Adjusting data to fit theory is the real failure.
Do I need a working model as well? No. CBSE asks for an investigatory project, and a model with no measurement behind it is the weaker choice.
