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Class 12 Physics — Chapter 12: Atoms
90 practice questions · 30 Easy · 30 Medium · 30 Hard
Free NCERT-aligned multiple-choice practice for Class 12 Physics, Chapter 12 (Atoms). Practise timed Easy, Medium and Hard quizzes with instant explanations — built for CBSE Board exams, JEE Main and NEET UG. Here are a few sample questions; sign in free to practise all 90.
Sample questions
Q1Easy
Bohr's model: angular momentum is:
A.Quantised in units of ℏ✓ correct
B.Continuous
C.Zero
D.Infinite
Why
L = nℏ.
Q2Medium
Energy of nth Bohr orbit (H atom):
A.−13.6/n² eV✓ correct
B.+13.6 eV
C.−13.6·n² eV
D.0
Why
Negative — bound state.
Q3Hard
Lyman series corresponds to transitions to:
A.n = 1✓ correct
B.n = 2
C.n = 3
D.n = ∞
Why
Ground state — UV region.
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