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Physics - Atomic Physics

Practise 54 COMEDK previous year questions on Atomic Physics, compiled from papers spanning 2012 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 COMEDK tests.

Atomic Physics has been asked in 15 of the 15 years of COMEDK papers analysed (2012–2026), with 54 questions in all. 54% of them were easy, 41% moderate and 6% tough. Most of its questions came from 2024, with 9 questions that year. In the last three years (2024–2026) it had 21 questions across 10 papers, about 2.1 per paper.

The chapter's 4 topics are not weighted equally: Bohr's Atomic Model (26 questions, 48%), Atomic Spectrum (21 questions, 39%), and Atomic Structure (6 questions, 11%) have been asked the most. Bohr's Atomic Model has also led over the last five years, with 19 questions. Bohr's Atomic Model has produced the most tough questions (2).

  1. 1An atom with one electron has ionization energy of 24 eV. An electron in this atom makes a transition from an excited energy level, where E 09 May, 2026 (S1)Bohr's Atomic Model
  2. 2An atom has a single electron. Its ground state energy is and its first excited state energy is . The atom is bombarded with a stream of pho09 May, 2026 (S1)Bohr's Atomic Model
  3. 3What is the frequency of the electron in the first orbit of hydrogen atom of orbital radius m, if its orbital velocity in that orbit is .09 May, 2026 (S2)Bohr's Atomic Model
  4. 4A hydrogen atom absorbs energy and rises to n = 3 state from its ground state n = 1. If the potential energy of the atom at its ground state09 May, 2026 (S2)Bohr's Atomic Model
  5. 5The ratio of the speed of electron in the orbit of to the speed of electron in the ground state of hydrogen atom will be:25 May, 2025 (Shift)Bohr's Atomic Model
  6. 6If an electron from a hydrogen like atom with jumps from the orbit to the orbit, it emits a photon of wavelength . What is the wavelength of25 May, 2025 (Shift)Atomic Spectrum
  7. 7According to Bohr's theory of hydrogen atom, the speed of the electron, its energy and radius of its orbit vary with the principal quantum n10 May, 2025 (S1)Bohr's Atomic Model
  8. 8Which, of the following is true of the Balmer series of the hydrogen spectrum? a. The series is in the visible region. b. The entire series 10 May, 2025 (S1)Atomic Spectrum
  9. 9What is the frequency ' ' of the electron in Bohr's first orbit of radius ' ' of the hydrogen atom?10 May, 2025 (S2)Bohr's Atomic Model
  10. 10What is the kinetic energy of the electron in the nth level, moving in a plane under the influence of a magnetic field 'B'? [ m-mass of elec10 May, 2025 (S2)Bohr's Atomic Model
  11. 11The minimum energy required by a hydrogen atom in ground state to emit radiation in Paschen series is nearly:10 May, 2025 (S3)Bohr's Atomic Model
  12. 12Which of the following is correct in the case of the Bohr model of atoms? A. Predicts continuous emission spectra for all atoms B. Assumes t10 May, 2025 (S3)Atomic Structure
  13. 13The shortest wavelengths of Paschen, Lymen and Balmer series are in the ratio2024 (Afternoon Shift)Atomic Spectrum
  14. 14In a hydrogen atom, if electron is replaced by a particle which is 40 times heavier but has the same charge, then, the ratio of the radius o2024 (Afternoon Shift)Bohr's Atomic Model
  15. 15If an electron in a hydrogen atom jumps from the third orbit to the second orbit, it emits a photon of wavelength . When it jumps from the s2024 (Evening Shift)Bohr's Atomic Model
  16. 16The distance of closest approach when an alpha particle of kinetic energy strikes a nucleus of atomic number 50 is2024 (Evening Shift)Bohr's Atomic Model
  17. 17An electron has a mass of . It revolves round the nucleus in a circular orbit of radius at a speed of . The magnitude of its angular momentu2024 (Evening Shift)Bohr's Atomic Model
  18. 18Calculate the radius of the second Bohr's orbit of electron of hydrogen atom.2024 (Memory Based)Bohr's Atomic Model
  19. 19In a helium ion, if potential energy of electron in ground state is assumed to be zero, then its energy in first excited state is equal to2024 (Memory Based)Bohr's Atomic Model
  20. 20The minimum radial distance between first orbit and second orbit in ion, if the de-Broglie wavelength of an electron in first orbit is , wil2024 (Memory Based)Bohr's Atomic Model
  21. 21The difference in energy levels of an electron at two excited levels is . If it makes a transition from the higher energy level to the lower2024 (Morning Shift)Bohr's Atomic Model
  22. 22In the head-on collision of two alpha particles and with the gold nucleus, the closest approaches are 31.4 fermi and 94.2 fermi respectively2023 (Evening Shift)Atomic Structure
  23. 23The ground state energy of hydrogen atom is . If the electron jumps from the excited state to the ground state then the energy of the radiat2023 (Evening Shift)Bohr's Atomic Model
  24. 24The wavelength of the first line of Lyman series for - atom is equal to that of the second line of Balmer series for a -like ion. The atomic2023 (Memory Based)Bohr's Atomic Model
  25. 25The first emission of hydrogen atomic spectrum in Lyman series appears at a wavelength of2023 (Memory Based)Atomic Spectrum
  26. 26The first emission of hydrogen atomic spectrum in Lyman series appears at a wavelength of2023 (Morning Shift)Atomic Spectrum
  27. 27The wavelength of the first line of Lyman series for - atom is equal to that of the second line of Balmer series for a -like ion. The atomic2023 (Morning Shift)Atomic Spectrum
  28. 28Which of the following series spectrum of hydrogen atom lies in ultraviolet region?2022Atomic Spectrum
  29. 29The wavelength of the second line of Balmer series is . What is the wavelength of the first line of Lyman series?2022Atomic Spectrum
  30. 30The Lyman series of a hydrogen atom belongs in which category2021Atomic Spectrum
  31. 31If an electron in hydrogen atom jumps from an orbit of level to an orbit at level , emitted radiation has a frequency of ( Rydberg's constan2021Bohr's Atomic Model
  32. 32Which of the following statement is incorrect?2021Atomic Structure
  33. 33An electron of an atom transits from to . In which of the following maximum frequency of photon will be emitted?2020Bohr's Atomic Model
  34. 34Which state of triply ionised Beryllium has the same orbital radius as that of the ground state of hydrogen?2019Bohr's Atomic Model
  35. 35Excitation energy of a hydrogen like ion in its first excitation state is . Energy needed to remove the electron from the ion in ground stat2019Bohr's Atomic Model
  36. 36The spectrum obtained from the chromosphere of the sun at the time of total solar eclipse is2019Atomic Spectrum
  37. 37The ratio of minimum wavelength of Lyman and Balmer series will be2018Atomic Spectrum
  38. 38Hydrogen atom does not emit X-rays because2018Atomic Spectrum
  39. 39The electron in a hydrogen atom makes a transition from to state. The time period of the electron in the initial state is eight times that i2017Bohr's Atomic Model
  40. 40Bohr's atom model assumes2017Bohr's Atomic Model
  41. 41Particles which are not composite and hence truly elementary are2016Atomic Structure
  42. 42Electrons are excited from to state. During downward transitions, possible number of spectral lines observed in Balmer series is2016Atomic Spectrum
  43. 43The existence of excitation and ionisation energies in an atom is an evidence for2016Atomic Spectrum
  44. 44The shortest wavelengths of Paschen, Balmer and Lyman series are in the ratio2015Atomic Spectrum
  45. 45The amount of energy required to separate a hydrogen atom into a proton and an electron is2014Atomic Spectrum
  46. 46The spectrum obtained from the chromosphere of the sun at the time of total solar eclipse is2013Atomic Spectrum
  47. 47Which state of triply ionised Beryllium has the same orbital radius as that of the ground state of hydrogen?2013Atomic Spectrum
  48. 48If is the atomic mass and is the mass number, packing fraction is given by2013Atomic Structure
  49. 49Excitation energy of a hydrogen like ion in its first excitation state is . Energy needed to remove the electron from the ion in ground stat2013Atomic Spectrum
  50. 50Choose the wrong statement.2012Atomic Structure

Frequently Asked Questions

1.How many questions are available for Atomic Physics?

This chapter includes 54 questions compiled from COMEDK papers spanning 2012 to 2026.

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

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

3.Is Atomic Physics an important chapter for COMEDK Physics?

Atomic Physics has appeared in 15 of the 15 years of COMEDK papers covered here, with 54 questions across 24 papers - about 2 per paper it appears in.

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

Of the 54 questions analysed for this chapter, 54% are easy, 41% moderate and 6% tough. 2024 had the most, with 9 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 - 26 questions (48%)
  • Atomic Spectrum - 21 questions (39%)
  • Atomic Structure - 6 questions (11%)
  • Bohr's Atomic Model has produced the most tough questions (2).
6.Is Atomic Physics's weightage in COMEDK going up or down?

Across all 24 papers analysed, Atomic Physics has averaged about 2.3 questions per paper. In the last three years (2024–2026), that average has stayed about the same, at about 2.1 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.