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Friday, 9 October

JEE Main Physics · Class 12

Atoms: JEE Main previous year questions

Atoms had 33 questions in the 42 JEE Main shifts Lumi analysed, about 0.8 a shift, asked in 28 of 42 shifts. It ranks 20 of 29 Physics chapters by questions; 0% of its questions were hard.

Questions
33
in 28 of 42 shifts
A shift, on average
0.8
of 25 Physics questions
Since 2024
-0.1
0.8 a shift in 2017–23, 0.7 in 2024–26
Numerical answer
11
33% of its questions

Year by year

How often it came

Questions in the analysed shifts of each year. Years differ in how many shifts Lumi analysed, so read the bars with the shift count.

Questions each year
0482’172’202’213’225’237’247’255’26

2017: 1 shifts · 2020: 4 shifts · 2021: 4 shifts · 2022: 4 shifts · 2023: 4 shifts · 2024: 8 shifts · 2025: 8 shifts · 2026: 9 shifts

Difficulty by year
  • 20172
  • 20202
  • 20212
  • 20223
  • 20235
  • 20247
  • 20257
  • 20265
  • Easy
  • Medium
  • Hard

Inside the chapter

Topics and the ideas that repeat

5 topics and 21 distinct ideas; 7 ideas were asked more than once. Most questions are single correct and calculation.

Topics, by questions

2 questions had no close topic in our taxonomy and are counted for the chapter only.

Ideas asked most
7 repeat

Study it on Lumi

Atoms: the interactive lesson

Every question

All 33 Atoms questions

Newest first. Each opens with its options and the official answer.

2026 5 questions

  1. 2 Apr 2026, Shift 1 · Q44Angular momentum of an electron in a hydrogen atom is 3hπ\frac{3h}{\pi}, then the energy of the electron is ______ eV.EasySingle correct
  2. 2 Apr 2026, Shift 2 · Q47Using Bohr's model, calculate the ratio of the magnetic fields generated due to the motion of the electrons in the 2nd and 4th orbits of…MediumNumerical value
  3. 4 Apr 2026, Shift 2 · Q43In Rutherford's alpha-particle scattering experiment, only a few alpha particles rebound back because A. The size of gold nucleus is very…MediumOther
  4. 5 Apr 2026, Shift 1 · Q36In the hydrogen atom, the electron makes a transition from the higher orbit (ii) to a lower orbit (ff). The ratio of the radius of the…EasySingle correct
  5. 6 Apr 2026, Shift 1 · Q44The ratio of momentum of the photons of the 1st1^{\mathrm{st}} and 2nd2^{\mathrm{nd}} line of Balmer series of Hydrogen atoms is…MediumSingle correct

2025 7 questions

  1. 2 Apr 2025, Shift 1 · Q43Considering Bohr's atomic model for hydrogen atom : (A) the energy of H atom in ground state is same as energy of He+\mathrm{He^+} ion in…EasyOther
  2. 2 Apr 2025, Shift 2 · Q40Assuming the validity of Bohr's atomic model for hydrogen like ions the radius of Li++\mathrm{Li^{++}} ion in its ground state is given by…EasySingle correct
  3. 3 Apr 2025, Shift 2 · Q44Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A : The Bohr model is…EasyAssertion–reason
  4. 3 Apr 2025, Shift 2 · Q50An electron in the hydrogen atom initially in the fourth excited state makes a transition to nth\mathrm{n^{th}} energy state by emitting a…EasyNumerical value
  5. 4 Apr 2025, Shift 2 · Q41Given below are two statements : Statement (I) : The dimensions of Planck's constant and angular momentum are same. Statement (II) : In…EasyTwo statements
  6. 7 Apr 2025, Shift 1 · Q43For a hydrogen atom, the ratio of the largest wavelength of Lyman series to that of the Balmer series isEasySingle correct
  7. 7 Apr 2025, Shift 1 · Q44In a hydrogen like ion, the energy difference between the 2nd2^{\mathrm{nd}} excitation energy state and ground is 108.8 eV. The atomic…EasySingle correct

2024 7 questions

  1. 6 Apr 2024, Shift 2 · Q48The longest wavelength associated with Paschen series is : (Given RH=1.097×107R_H=1.097\times10^7 SI unit)EasySingle correct
  2. 6 Apr 2024, Shift 2 · Q55In Franck-Hertz experiment, the first dip in the current-voltage graph for hydrogen is observed at 10.2 V. The wavelength of light emitted…EasyNumerical value
  3. 8 Apr 2024, Shift 1 · Q58In an alpha particle scattering experiment distance of closest approach for the α\alpha particle is 4.5×10−144.5\times10^{-14} m. If target…MediumNumerical value
  4. 9 Apr 2024, Shift 2 · Q35A hydrogen atom in ground state is given an energy of 10.210.2 eV. How many spectral lines will be emitted due to transition of electrons ?EasySingle correct
  5. 29 Jan 2024, Shift 1 · Q60When a hydrogen atom going from nn=2 to nn=1 emits a photon, its recoil speed is x5 m/s\frac{x}{5}\ m/s. Where xx = ______. (Use, mass of…MediumNumerical value
  6. 30 Jan 2024, Shift 2 · Q48An electron revolving in nthn^{\mathrm{th}} Bohr orbit has magnetic moment μn\mu_n. If μn∝nx\mu_n \propto n^x, the value of xx isEasySingle correct
  7. 31 Jan 2024, Shift 1 · Q47If the wavelength of the first member of Lyman series of hydrogen is λ\lambda. The wavelength of the second member will beEasySingle correct

2023 5 questions

  1. 6 Apr 2023, Shift 1 · Q34The energy levels of an hydrogen atom are shown below. The transition corresponding to emission of shortest wavelength isEasyDiagram basedHas a figure
  2. 6 Apr 2023, Shift 1 · Q53The radius of fifth orbit of the Li++\mathrm{Li^{++}} is ____________ ×10−12\times10^{-12} m. Take: radius of hydrogen atom = 0.51 ÅEasyNumerical value
  3. 8 Apr 2023, Shift 2 · Q56The ratio of wavelength of spectral lines Hα\mathrm{H}_\alpha and Hβ\mathrm{H}_\beta in the Balmer series is x20\frac{x}{20}. The value of…EasyNumerical value
  4. 11 Apr 2023, Shift 1 · Q51A monochromatic light is incident on a hydrogen sample in ground state. Hydrogen atoms absorb a fraction of light and subsequently emit…MediumNumerical value
  5. 13 Apr 2023, Shift 2 · Q60An atom absorbs a photon of wavelength 500500 nm and emits another photon of wavelength 600600 nm. The net energy absorbed by the atom in…MediumNumerical value

2022 3 questions

  1. 25 Jul 2022, Shift 1 · Q48The momentum of an electron revolving in nthn^{\mathrm{th}} orbit is given by : (Symbols have their usual meanings)EasySingle correct
  2. 24 Jun 2022, Shift 1 · Q44Choose the correct option from the following options given below :EasySingle correct
  3. 29 Jun 2022, Shift 1 · Q57d1\sqrt{d_1} and d2\sqrt{d_2} are the impact parameters corresponding to scattering angles 60∘60^\circ and 90∘90^\circ respectively, when an…MediumNumerical value

2021 2 questions

  1. 3 Aug 2021, Shift 2 · Q23The ratio of shortest wavelength to the largest wavelength in Brackett series of atomic spectra for hydrogen atom is x:25x : 25, where the…MediumNumerical value
  2. 18 Mar 2021, Shift 1 · Q10Imagine that the electron in a hydrogen atom is replaced by a muon (μ\mu). The mass of muon particle is 207 times that of an electron and…MediumSingle correct

2020 2 questions

  1. 8 Jan 2020, Shift 1 · Q18The graph which depicts the results of Rutherford gold foil experiment with α\alpha-particles is : θ\theta : Scattering angle Y : Number…MediumDiagram basedHas a figure
  2. 9 Jan 2020, Shift 2 · Q19The energy required to ionise a hydrogen like ion in its ground state is 9 Rydbergs. What is the wavelength of the radiation emitted when…MediumSingle correct

2017 2 questions

  1. 2 Apr 2017 (offline) · Q21An electron beam is accelerated by a potential difference V to hit a metallic target to produce X-rays. It produces continuous as well as…MediumSingle correctHas a figure
  2. 2 Apr 2017 (offline) · Q25Some energy levels of a molecule are shown in the figure. The ratio of the wavelengths r=λ1/λ2r=\lambda_1/\lambda_2, is given by :EasySingle correctHas a figure

Pattern: Asked most years.