JEE Main Physics · Atoms

Bohr's Atomic Model in JEE Main

Name: Bohr's Atomic Model: JEE Main previous year questions
Creator: Lumi

Bohr's Atomic Model (Physics, Atoms) came 25 times in 21 of the 42 JEE Main shifts Lumi analysed, across 17 distinct ideas. 16 of them came in 2024–26; it was last asked in 2026.

Questions: 25; in 21 shifts
Ideas asked: 17; 6 asked more than once
Numerical answer: 8; 32% of its questions
Pattern: Asked most years; last asked 2026

Questions each year

In the shifts Lumi analysed for each year.

Difficulty and format

Easy 18Medium 7Hard 0

Format

Single correct13 Q
Numerical value8 Q
Assertion–reason1 Q
Two statements1 Q
Other1 Q
Diagram based1 Q

Ideas inside the topic

17 ideas

Shortest and Longest Wavelengths3 Q
Energy Level Calculations3 Q
Rydberg Formula and Spectra2 Q
Angular Momentum Quantization2 Q
Bohr Orbit Radius2 Q
Number of Spectral Lines2 Q
Atom Recoil During Emission1 Q
Magnetic Field and Dipole Moment1 Q
Reduced Mass Effect1 Q
Limitations of Bohr's Model1 Q
Balmer Series Specific Lines1 Q
Identifying Atomic Number from Spectra1 Q

Where it sits

Part of Atoms, which had 33 questions in all. Bohr's Atomic Model accounts for 76% of them. In Lumi's JEE taxonomy it belongs to Modern Physics.

Every question

All 25 Bohr's Atomic Model questions

Newest first, each with its options and official answer.

2 Apr 2026, Shift 1 · Q44Angular momentum of an electron in a hydrogen atom is $\frac{3h}{\pi}$ , then the energy of the electron is ______ eV.EasySingle correct
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
5 Apr 2026, Shift 1 · Q36In the hydrogen atom, the electron makes a transition from the higher orbit ( $i$ ) to a lower orbit ( $f$ ). The ratio of the radius of the…EasySingle correct
6 Apr 2026, Shift 1 · Q44The ratio of momentum of the photons of the $1^{\mathrm{st}}$ and $2^{\mathrm{nd}}$ line of Balmer series of Hydrogen atoms is…MediumSingle correct
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 $\mathrm{He^+}$ ion in…EasyOther
2 Apr 2025, Shift 2 · Q40Assuming the validity of Bohr's atomic model for hydrogen like ions the radius of $\mathrm{Li^{++}}$ ion in its ground state is given by…EasySingle correct
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
3 Apr 2025, Shift 2 · Q50An electron in the hydrogen atom initially in the fourth excited state makes a transition to $\mathrm{n^{th}}$ energy state by emitting a…EasyNumerical value
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
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 Apr 2025, Shift 1 · Q44In a hydrogen like ion, the energy difference between the $2^{\mathrm{nd}}$ excitation energy state and ground is 108.8 eV. The atomic…EasySingle correct
6 Apr 2024, Shift 2 · Q48The longest wavelength associated with Paschen series is : (Given $R_H=1.097\times10^7$ SI unit)EasySingle correct
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
9 Apr 2024, Shift 2 · Q35A hydrogen atom in ground state is given an energy of $10.2$ eV. How many spectral lines will be emitted due to transition of electrons ?EasySingle correct
29 Jan 2024, Shift 1 · Q60When a hydrogen atom going from $n$ =2 to $n$ =1 emits a photon, its recoil speed is $\frac{x}{5}\ m/s$ . Where $x$ = ______. (Use, mass of…MediumNumerical value
31 Jan 2024, Shift 1 · Q47If the wavelength of the first member of Lyman series of hydrogen is $\lambda$ . The wavelength of the second member will beEasySingle correct
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
6 Apr 2023, Shift 1 · Q53The radius of fifth orbit of the $\mathrm{Li^{++}}$ is ____________ $\times10^{-12}$ m. Take: radius of hydrogen atom = 0.51 ÅEasyNumerical value
8 Apr 2023, Shift 2 · Q56The ratio of wavelength of spectral lines $\mathrm{H}_\alpha$ and $\mathrm{H}_\beta$ in the Balmer series is $\frac{x}{20}$ . The value of…EasyNumerical value
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
25 Jul 2022, Shift 1 · Q48The momentum of an electron revolving in $n^{\mathrm{th}}$ orbit is given by : (Symbols have their usual meanings)EasySingle correct
3 Aug 2021, Shift 2 · Q23The ratio of shortest wavelength to the largest wavelength in Brackett series of atomic spectra for hydrogen atom is $x : 25$ , where the…MediumNumerical value
18 Mar 2021, Shift 1 · Q10Imagine that the electron in a hydrogen atom is replaced by a muon ( $\mu$ ). The mass of muon particle is 207 times that of an electron and…MediumSingle correct
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
2 Apr 2017 (offline) · Q25Some energy levels of a molecule are shown in the figure. The ratio of the wavelengths $r=\lambda_1/\lambda_2$ , is given by :EasySingle correctHas a figure