Hydrogen Spectrum MCQs (NCERT Based)
Hydrogen Spectrum MCQs (NCERT Based)
Class: CBSE Class 12
Subject: Physics
Section: Atoms and Nuclei
Topic: Hydrogen Spectrum
Based on: CBSE Board Examination Pattern (NCERT)
Instructions: These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 12 Board Examination preparation.
1. Hydrogen spectrum is a:
Answer: B
Hydrogen emits discrete spectral lines due to quantized transitions.
Hydrogen emits discrete spectral lines due to quantized transitions.
2. Spectral lines arise due to:
Answer: B
Photons are emitted when electrons jump between energy levels.
Photons are emitted when electrons jump between energy levels.
3. Lyman series lies in:
Answer: C
Transitions ending at n = 1 produce UV lines.
Transitions ending at n = 1 produce UV lines.
4. Balmer series lies in:
Answer: A
Transitions ending at n = 2.
Transitions ending at n = 2.
5. Paschen series lies in:
Answer: B
Transitions ending at n = 3 lie in infrared.
Transitions ending at n = 3 lie in infrared.
6. Rydberg formula is:
Answer: A
It predicts wavelengths of hydrogen spectral lines.
It predicts wavelengths of hydrogen spectral lines.
7. Rydberg constant unit:
Answer: A
Used in wave number calculations.
Used in wave number calculations.
8. Maximum wavelength occurs in:
Answer: D
Occurs for transition between nearest levels.
Occurs for transition between nearest levels.
9. Minimum wavelength occurs when electron falls from:
Answer: B
Series limit transition gives shortest wavelength.
Series limit transition gives shortest wavelength.
10. Hydrogen spectral lines confirm:
Answer: B
Supports Bohr quantization.
Supports Bohr quantization.
11. Brackett series ends at:
Answer: C
Infrared region.
Infrared region.
12. Pfund series ends at:
Answer: A
Far infrared.
Far infrared.
13. Wave number is:
Answer: A
Used in Rydberg formula.
Used in Rydberg formula.
14. Visible hydrogen spectrum belongs to:
Answer: B
Most prominent lines.
Most prominent lines.
15. Energy of photon emitted equals:
Answer: A
Difference between energy levels.
Difference between energy levels.
16. Spectrum convergence occurs because:
Answer: A
Energy gap decreases at higher n.
Energy gap decreases at higher n.
17. Hydrogen atom has:
Answer: A
Simplest atomic system.
Simplest atomic system.
18. Series limit corresponds to:
Answer: B
Electron transition from infinity.
Electron transition from infinity.
19. Hydrogen emission spectrum was explained by:
Answer: A
Using quantized orbits.
Using quantized orbits.
20. Spectral series confirm:
Answer: A
Energy quantization principle.
Energy quantization principle.