← CBSE Class 12 PYQ

Atoms

CBSE Class 12 · Physics · 17 past questions

Q1 2026

For question number 13 to 16, two statements are given – one labelled as Assertion (A) and the other labelled…
Q2 2026

In Bohr model of hydrogen atom, the electron makes a transition from n = 5 to n = 1 state. As a result, a…
Q3 2025

A hydrogen atom consists of an electron revolving in a circular orbit of radius r with certain velocity v…
Q4 2025

The energy of an electron in a hydrogen atom in ground state is $-13.6$ eV. Its energy in an orbit…
Q5 2025

For Questions 13 to 16, two statements are given – one labelled Assertion (A) and other labelled Reason (R).…
Q6 2025

Assertion (A) : The potential energy of an electron revolving in any stationary orbit in a hydrogen atom is…
Q7 2024

A proton and an alpha particle having equal velocities approach a target nucleus. They come momentarily to…
Q8 2024

An electron makes a transition from n = 2 level to n = 1 level in the Bohr model of a hydrogen atom. Its…
Q9 2024

The transition of electron that gives rise to the formation of the second spectral line of the Balmer series…
Q10 2024

Energy levels A, B and C of an atom correspond to increasing values of energy i.e. $E_A < E_B < E_C$. Let…
Q11 2024

Using Bohr's postulates, derive the expression for the radius of the nᵗʰ orbit of an electron in a hydrogen…
Q12 2023

A hydrogen atom makes a transition from n = 5 to n = 1 orbit. The wavelength of photon emitted is $\lambda$.…
Q13 2023

The ratio of maximum frequency and minimum frequency of light emitted in Balmer series of hydrogen spectrum…
Q14 2023

The radius of the n$^{th}$ orbit in Bohr model of hydrogen atom is proportional to…
Q15 2023

Hydrogen atom initially in the ground state, absorbs a photon which excites it to n = 5 level. The wavelength…
Q16 2023

The ground state energy of hydrogen atom is $-13.6$ eV. What is the potential energy and kinetic energy of an…
Q17 2022