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Teachoo MCQ Test

CBSE Past Year MCQ Quiz

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Chapter 12 - Atoms | 5 questions

Timed test. Answer every question before time runs out. Correct answers and solutions appear after submission.
Time remaining 480
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 :

Select one option. Answers are shown after the test.
Question 2 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 –

Select one option. Answers are shown after the test.
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

Paschen series in spectrum of hydrogen atom lies in :

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Question 5 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 :

Select one option. Answers are shown after the test.