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Physics - Atomic Physics

Practise 155 JEE Main previous year questions on Atomic Physics, compiled from papers spanning 2002 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty JEE Main tests.

Atomic Physics has been asked in 24 of the 25 years of JEE Main papers analysed (2002–2026), with 155 questions in all. 44% of them were easy, 46% moderate and 10% tough. Most of its questions came from 2024, with 23 questions that year. In the last three years (2024–2026) it had 40 questions across 49 papers, about 0.8 per paper.

The chapter's 4 topics are not weighted equally: Bohr's Atomic Model (70 questions, 45%), Atomic Spectrum (60 questions, 39%), and Atomic Structure (21 questions, 14%) have been asked the most. Bohr's Atomic Model has also led over the last five years, with 37 questions. Bohr's Atomic Model has produced the most tough questions (7).

  1. 1The ratio of momentum of the photons of the and line of Balmer series of Hydrogen atoms is . The possible values of and are:-06 Apr, 2026 (M)Bohr's Atomic Model
  2. 2In the hydrogen atom, the electron makes a transition from the higher orbit ( ) to a lower orbit ( ). The ratio of the radius of the orbits 05 Apr, 2026 (M)Bohr's Atomic Model
  3. 3In Rutherford's alpha-particle scattering experiment, only a few alpha particles rebound back because A. The size of gold nucleus is very sm04 Apr, 2026 (E)Atomic Structure
  4. 4Angular momentum of an electron in a hydrogen atom is , then the energy of the electron is _______ eV.02 Apr, 2026 (M)Bohr's Atomic Model
  5. 5Using Bohr's model, calculate the ratio of the magnetic fields generated due to the motion of the electrons in the and orbits of hydrogen at02 Apr, 2026 (E)Bohr's Atomic Model
  6. 6Two electrons are moving in orbits of two hydrogen like atoms with speeds and respectively. If the radii of these orbits are nearly same the24 Jan, 2026 (M)Bohr's Atomic Model
  7. 7In hydrogen atom spectrum, Rydberg's constant A. the maximum wavelength of the radiation of Lyman series is B. the Balmer series lies in the23 Jan, 2026 (M)Atomic Spectrum
  8. 8The smallest wavelength of Lyman series is 91 nm. The difference between the largest wavelengths of Paschen and Balmer series is nearly nm .22 Jan, 2026 (E)Atomic Spectrum
  9. 9If an alpha particle with energy 7.7 MeV is bombarded on a thin gold foil, the closest distance from nucleus it can reach is m. (Atomic numb21 Jan, 2026 (M)Atomic Structure
  10. 10The energy of an electron in an orbit of the Bohr's atom is where is the ground state energy. If is the angular momentum of the electron in 21 Jan, 2026 (E)Bohr's Atomic Model
  11. 11In a hydrogen like ion, the energy difference between the excitation energy state and ground is 108.8 eV. The atomic number of the ion is07 Apr, 2025 (M)Bohr's Atomic Model
  12. 12For a hydrogen atom, the ratio of the largest wavelength of Lyman series to that of the Balmer series is.07 Apr, 2025 (M)Atomic Spectrum
  13. 13Considering the Bohr model of hydrogen like atoms, the ratio of the ratio of the radius orbit of the electron in and is04 Apr, 2025 (M)Bohr's Atomic Model
  14. 14Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R . Assertion A: The Bohr model is applic03 Apr, 2025 (E)Atomic Structure
  15. 15An electron in the hydrogen atom initially in the fourth excited state makes a transition to energy state by emitting a photon of energy 2.803 Apr, 2025 (E)Bohr's Atomic Model
  16. 16Considering Bohr's atomic model for hydrogen atom : (A) the energy of H atom in ground state is same as energy of ion in its first excited s02 Apr, 2025 (M)Atomic Structure
  17. 17Assuming the validity of Bohr's atomic model for hydrogen like ions the radius of ion in its ground state is given by , where _______. (Wher02 Apr, 2025 (E)Bohr's Atomic Model
  18. 18Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Emission of elect29 Jan, 2025 (M)Atomic Models
  19. 19The number of spectral lines emitted by atomic hydrogen that is in the energy level, is29 Jan, 2025 (E)Atomic Spectrum
  20. 20The frequency of revolution of the electron in Bohr's orbit varies with , the principal quantum number as28 Jan, 2025 (E)Bohr's Atomic Model
  21. 21During the transition of electron from state A to state C of a Bohr atom, the wavelength of emitted radiation is and it becomes when the ele24 Jan, 2025 (M)Atomic Spectrum
  22. 22Arrange the following in the ascending order of wavelength : (A) Microwaves (B) Ultraviolet rays (C) Infrared rays (D) X-rays Choose the mos24 Jan, 2025 (E)Atomic Spectrum
  23. 23A hydrogen atom in ground state is given an energy of . How many spectral lines will be emitted due to transition of electrons?09 Apr, 2024 (E)Atomic Spectrum
  24. 24In an alpha particle scattering experiment distance of closest approach for the particle is . If target nucleus has atomic number 80 , then 08 Apr, 2024 (M)Atomic Structure
  25. 25The ratio of the shortest wavelength of Balmer series to the shortest wavelength of Lyman series for hydrogen atom is :06 Apr, 2024 (M)Atomic Spectrum
  26. 26Radius of a certain orbit of hydrogen atom is . If energy of electron in this orbit is . then _____ (Given energy of electron in ground stat06 Apr, 2024 (M)Bohr's Atomic Model
  27. 27The longest wavelength associated with Paschen series is : (Given unit)06 Apr, 2024 (E)Atomic Spectrum
  28. 28In Franck-Hertz experiment, the first dip in the current-voltage graph for hydrogen is observed at 10.2 V. The wavelength of light emitted b06 Apr, 2024 (E)Atomic Spectrum
  29. 29An electron rotates in a circle around a nucleus having positive charge Ze. Correct relation between total energy (E) of electron to its pot05 Apr, 2024 (M)Bohr's Atomic Model
  30. 30The angular momentum of an electron in a hydrogen atom is proportional to : (Where is the radius of orbit of electron)05 Apr, 2024 (E)Bohr's Atomic Model
  31. 31The shortest wavelength of the spectral lines in the Lyman series of hydrogen spectrum is . The longest wavelength of spectral lines in the 05 Apr, 2024 (E)Atomic Spectrum
  32. 32A hydrogen atom changes its state from to . Due to recoil, the percentage change in the wave length of emitted light is approximately . The 04 Apr, 2024 (M)Atomic Spectrum
  33. 33According to Bohr's theory, the moment of momentum of an electron revolving in orbit of hydrogen atom is:04 Apr, 2024 (E)Bohr's Atomic Model
  34. 34The minimum energy required by a hydrogen atom in ground state to emit radiation in Balmer series is nearly :01 Feb, 2024 (M)Atomic Spectrum
  35. 35A particular hydrogen - like ion emits the radiation of frequency 3 × 10 15 Hz when it makes transition from n = 2 to n = 1 . The frequency 01 Feb, 2024 (E)Atomic Spectrum
  36. 36The mass defect in a particular reaction is 0 . 4 g . The amount of energy liberated is n × 10 7 kW h , where n = _____. (speed of light = 331 Jan, 2024 (M)Atomic Models
  37. 37If the wavelength of the first member of Lyman series of hydrogen is λ . The wavelength of the second member will be31 Jan, 2024 (M)Atomic Spectrum
  38. 38The ratio of the magnitude of the kinetic energy to the potential energy of an electron in the 5 th excited state of a hydrogen atom is :30 Jan, 2024 (M)Bohr's Atomic Model
  39. 39An electron of hydrogen atom on an excited state is having energy E n = - 0 . 85 eV . The maximum number of allowed transitions to lower ene30 Jan, 2024 (M)Atomic Spectrum
  40. 40An electron revolving in n th Bohr orbit has magnetic moment μ n . If μ n ∝ n x , the value of x is:30 Jan, 2024 (E)Bohr's Atomic Model
  41. 41When a hydrogen atom going from n = 2 to n = 1 emits a photon, its recoil speed is x 5 m s - 1 . Where x = _______. (Use: mass of hydrogen a29 Jan, 2024 (M)Atomic Spectrum
  42. 42Given below are two statements: Statement I: Most of the mass of the atom and all its positive charge are concentrated in a tiny nucleus and29 Jan, 2024 (E)Atomic Models
  43. 43Hydrogen atom is bombarded with electrons accelerated through a potential different of V , which causes excitation of hydrogen atoms. If the29 Jan, 2024 (E)Atomic Spectrum
  44. 44The radius of third stationary orbit of electron for Bohr's atom is R . The radius of fourth stationary orbit will be:27 Jan, 2024 (M)Bohr's Atomic Model
  45. 45If Rydberg's constant is R , the longest wavelength of radiation in Paschen series will be α 7 R , where α = ______.27 Jan, 2024 (E)Atomic Spectrum
  46. 46As per given figure A , B and C are the first, second and third excited energy levels of hydrogen atom respectively. If the ratio of the two15 Apr, 2023 (M)Atomic Spectrum
  47. 47The radius of 2 nd orbit of He + of Bohr s model is r 1 and that of fourth orbit of Be 3 + is represented as r 2 . Now the ratio r 2 r 1 is 13 Apr, 2023 (M)Bohr's Atomic Model
  48. 48An atom absorbs a photon of wavelength 500 nm and emits another photon of wavelength 600 nm . The net energy absorbed by the atom in this pr13 Apr, 2023 (E)Bohr's Atomic Model
  49. 49A 12 . 5 eV electron beam is used to bombard gaseous hydrogen at room temperature. The number of spectral lines emitted will be:12 Apr, 2023 (M)Bohr's Atomic Model
  50. 50A monochromatic light is incident on a hydrogen sample in ground state. Hydrogen atoms absorb a fraction of light and subsequently emit radi11 Apr, 2023 (M)Atomic Spectrum

Frequently Asked Questions

1.How many questions are available for Atomic Physics?

This chapter includes 155 questions compiled from JEE Main papers spanning 2002 to 2026.

2.Are these questions only from JEE Main, or from other exams too?

These are JEE Main questions specifically for the Atomic Physics chapter. Questions from other exams like NTA Abhyas (JEE Main) or JEE Advanced are organised separately under their respective exam sections.

3.Is Atomic Physics an important chapter for JEE Main Physics?

Atomic Physics has appeared in 24 of the 25 years of JEE Main papers covered here, with 155 questions across 132 papers - about one per paper it appears in.

4.What is the difficulty level of Atomic Physics questions in JEE Main?

Of the 155 questions analysed for this chapter, 44% are easy, 46% moderate and 10% tough. 2024 had the most, with 23 questions.

5.Which topics in Atomic Physics should I focus on?

These topics have carried the most weightage in Atomic Physics:

  • Bohr's Atomic Model - 70 questions (45%)
  • Atomic Spectrum - 60 questions (39%)
  • Atomic Structure - 21 questions (14%)
  • Bohr's Atomic Model has produced the most tough questions (7).
6.Is Atomic Physics's weightage in JEE Main going up or down?

Across all 132 papers analysed, Atomic Physics has averaged about 1.2 questions per paper. In the last three years (2024–2026), that average has fallen, at about 0.8 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.