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Class 12 Physics Chapter 12 - Atoms MCQ and Assertion Questions

Short Quiz · Class 12 · Physics · CBSE

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Chapter 12 - Atoms | 5 questions | about 4 minutes

Practise Chapter 12 - Atoms with Teachoo's Short Quiz (Class 12 · Physics · CBSE). Practise these questions in a free interactive quiz with answer feedback.

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Question 1 of 5
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Question 1 of 5
CBSE Past Year 2026

The energy of an electron in an orbit in hydrogen atom is – 3·4 eV. Its angular momentum in the orbit will be :

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Question 2 of 5
CBSE Past Year 2026

The energy of an electron revolving in the \(n^{th}\) orbit in Bohr model of hydrogen atom is proportional to :

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Question 3 of 5
CBSE Past Year 2026

The ratio of the de Broglie wavelengths associated with the electron revolving in the first and third orbits in hydrogen atom is :

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Question 4 of 5
CBSE Past Year 2026

The ‘distance of closest approach’ of an alpha-particle is ‘d’ when it moves with a velocity ν head-on towards the target nucleus. If the velocity of alpha particle is halved, the new ‘distance of closest approach’ will be –

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Question 5 of 5
CBSE Past Year 2026

Reason (A) : In Bohr model of hydrogen atom, the energy levels are discrete and quantised.

Reason (R) : In a hydrogen atom, the electrostatic force on the electron provides the necessary centripetal force to it to revolve around the nucleus.

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Practice · Chapter 12 - Atoms