JEE Modern Physics Quiz
Chapter-wise practice on the photoelectric effect, matter waves, the Bohr model, X-rays, radioactivity and nuclear physics - short formulas, high scoring density.
Skill map
Levels in this jee modern physics quiz
Every question is generated fresh by AI and calibrated to your level - clear a level and the next one gets harder. Miss one and the AI tutor explains Modern Physics until it sticks, then aims a follow-up at the gap. Want to grind one level? Start the quiz and type that sub-topic as your own.
Exam focus
How Modern Physics is asked
The highest marks-per-hour chapter in JEE Physics for most students: the formula set is small, the questions are usually single-step, and the concepts do not depend on earlier mechanics. If you are short on time before the exam, this is the chapter to secure first.
Cheat sheet
Modern Physics formulas worth memorising
| Quantity | Formula |
|---|---|
| Photon energy | E = hf = hc/λ |
| Photoelectric equation | hf = φ + KE(max) |
| Stopping potential | eV₀ = KE(max) |
| de Broglie wavelength | λ = h/p = h/mv |
| Bohr radius | r(n) ∝ n²/Z |
| Bohr energy (hydrogen-like) | E(n) = −13.6 Z²/n² eV |
| Radioactive decay | N = N₀e^(−λt) |
| Half-life | t½ = ln2/λ ≈ 0.693/λ |
Marks lost here
Common mistakes in Modern Physics
- Using E(n) = −13.6/n² for any atom. It applies only to hydrogen and hydrogen-like single-electron ions such as He⁺ and Li²⁺, where the Z² factor matters.
- Confusing the work function with the stopping potential. The work function is a property of the metal; the stopping potential depends on the incident frequency as well.
- Thinking brighter light gives photoelectrons more energy. Intensity changes how many electrons are emitted; only frequency changes their maximum kinetic energy - which is exactly what the photon model explained and the wave model could not.
- Mixing electronvolts and joules mid-calculation. Convert once at the start and stay in one unit; 1 eV = 1.6 × 10⁻¹⁹ J.
- Treating half-life as though decay were linear. After two half-lives one quarter remains, not zero - decay is exponential, so a fixed fraction is lost per interval rather than a fixed amount.
Game rules
How a round works
- 01Spawn
Press play - the AI generates Modern Physics questions in seconds.
- 02Level up
Answer to earn XP and build a streak. Difficulty adapts to your accuracy and speed.
- 03Learn or lose
Every answer - right or wrong - gets an AI tutor explanation. Wrong answers respawn as follow-ups.
Leaderboard
Modern Physics high scores
Next challenges
Related quizzes to conquer
JEE Electrostatics Quiz
▶Chapter-wise practice on Coulomb's law, electric field and potential, Gauss's law, conductors and capacitors - with reasoning for every answer, not just the result.
JEE Ray Optics Quiz
▶Practice on mirrors, lenses, refraction, total internal reflection, prisms and optical instruments - with the Cartesian sign convention applied explicitly in every solution.
JEE Waves Quiz
▶Practice on travelling and standing waves, superposition and interference, beats, organ pipes and the Doppler effect - including the sign conventions that decide half the marks.
JEE Physics Quiz
▶JEE Physics MCQs on mechanics, electricity & magnetism, thermodynamics, optics and modern physics - application-first questions the way JEE actually asks them.
Player's guide
JEE Modern Physics Quiz - FAQs
Is Modern Physics worth prioritising in JEE preparation?
For most students, yes. It has a small formula set, largely independent single-step questions, and little dependence on mechanics - so it converts study hours into marks faster than chapters like Rotational Motion, which need long multi-step solutions.
Why does the photoelectric effect need a particle model of light?
Because emission depends on frequency, not intensity, and begins with no measurable delay. A wave model predicts that any frequency should eventually free electrons if you wait long enough - which is not what happens. Light delivering energy in discrete quanta explains both observations.
Is the jee modern physics quiz free?
Yes - completely free, with no sign-up required. Type a topic, press start, and the AI generates an adaptive Modern Physics quiz with an explanation for every answer.
Can teachers host this jee modern physics quiz live for a class?
Yes - create a free teacher account, host a live room on "Modern Physics", and students join with a 6-character code at quff.in/join. No student accounts needed.
From the blog
Modern Physics guides & reading
JEE Modern Physics: 30 Practice Questions with Solutions
Thirty solved Modern Physics questions. The highest marks-per-hour chapter in JEE Physics, and the one to secure first if time is short.
Exam PrepJEE Atomic Structure: 30 Practice Questions with Solutions
Thirty solved Atomic Structure questions - and the chapter overlaps directly with Modern Physics, so the work counts twice.
Exam PrepJEE Waves: 30 Practice Questions with Full Solutions
Thirty solved Waves questions, including the Doppler sign convention worked out by reasoning rather than memorised.
More exam prep quizzes
Ready, player?
Six adaptive Modern Physics questions. About two minutes. Climb the podium.