CH-20 Atomic Spectra Leave a Comment / By abdulslambsn@gmail.com / October 6, 2025 Welcome To Your Quiz "CH-20 Atomic Spectra" Click on "Start Quiz" To Continue... 1. The first theory about the structure of an atom was introduced by: Neil Bohr Einstein Compton Rutherford None 2. Bohr was presented atomic model of hydrogen in: 1913 1919 1918 1905 None 3. The scientist who studies the spectrum of hydrogen in visible light, wavelength range was: Rydberg Bohr Balmer Paschen None 4. Balmer series lies in that region of electromagnetic wave spectrum, which is known as: Visible region Invisible region Ultraviolet region Infra-red region None 5. The process of formation of spectrum is known as: Diffraction Interference Refraction Spectroscopy None 6. Spectrum shows the number of component colour present in certain light in terms of: Frequency Energy Wavelength All of the above None 7. During the transition of electron of hydrogen atom from higher orbit to a 3rd orbit, a photon of: Paschen series is emitted Balmer series is emitted Lyman series is emitted Brakett series is emitted None 8. Which of the following is one of the spectral series of atomic hydrogen: Brockett series Balmer series P fund cities All of the above None 9. The radiation emitted from hydrogen filled discharge tube shows: Continuous Spectrum Line spectrum Band spectrum None of these None 10. In hydrogen atom which one of the following series lies in the infrared region: Lyman series Brackett series Paschen series Balmer series None 11. The longest wavelength of light which ionizes a hydrogen atom is: 912 A⁰ 0.74 A⁰ 400 A⁰ 720 A⁰ None 12. Radiation with wavelength shorter than violent is called: Ultraviolet radiation Infrared radiation Visible radiation None of these None 13. According to Rudder Ford Nuclear Model, the major constituents of the nucleus are: Neutrons and electrons Protons and positrons Neutron and protons Protons and electrons None 14. The numerical value of ground state energy of an electron in an orbit is the measure of: Excitation energy Excitation potential Ionization energy None of these None 15. If the ionization energy of hydrogen atom is 13.6 eV, its ionization potential will be: 136.0 volt 3.0 volt 13.6 volt None of these None 16. The diameter of an atom is of the order of: 10⁻¹⁶ m 10⁻⁸ m 10⁻¹⁰ m 10¹⁰ m None 17. The value of Planck's constant is: 9 x 10⁹ Nm² C⁻² 6.63 x 10⁻³⁴ J.S 9.1 x 10⁻³¹ kg 1.67 x 10⁻²⁷ kg None 18. The radius of first Bohr's orbit for hydrogen is: 0.053 nm 0.53 nm o.53 m None of these None 19. The first Bohr atom in the hydrogen atom has radius: 3.56 x 10⁻¹⁰ m 0.053 x 10⁻¹¹ m 0.53 x 10⁻¹¹ m 5.30 x 10⁻¹¹ m None 20. X- rays were discovered by: Curie Henry becquerel Rontgen None of these None 21. The transitions of electrons in the hydrogen atom result in the emission of spectral lines in the: Visible region Infrared region Ultraviolet region Any of these None 22. by CAT scans, we can detect the density difference of the order of: 1% 15% 10% 50% None 23. The maximum frequency in the spectrum from X rays tube is directly proportional to the: Number of incident electron The kinetic energy of the incident electron The soft target which can easily emit electron None of these None 24. The penetrating power of X- rays depends upon their: Frequency Applied voltage Wavelength None of these None 25. K- series of characteristic X-rays spectrum results when all the transitions of inner-shell electrons: K-shell M-shell L-shell None of these None 26. For the production of X -rays the target metal should be bombarded by: Electrons Neutrons Protons Positrons None 27. The transitions of inner shell electrons in heavy atoms give rise to the emission of: High energy of photon or X-rays High energy y- raise Low energy photons or X rays High Energy b-rays None 28. The duration of a laser pulse is 10⁻⁸ sec. The uncertainty in its energy will be: 10.500 x 10⁻²⁶ J 6.625 x 10⁻²⁸ J 6.625 x 10⁻²⁶ J 1.050 x 10⁻²⁸ J None 29. An atom can reside in excited state for: 10⁻⁸ second One second 10⁻¹⁰ second More than one second None 30. The process by which lesser beam can be used to generate three dimensional images of objects is called: Holography Geography Tomography Radiography None 31. The excited atoms returns to their ground state in: 10⁻¹⁰ sec 10⁻⁸ sec 10⁻⁶ sec 10⁻¹¹ sec None 32. Helium -Neon laser discharge tube contains neon: 82% 15% 25% 85% None 33. The idea of laser device was first introduced by C.H Townes and Authers Schowlan is: 1972 1965 1958 1913 None 34. The branch of physics in which laser is studied: Optics Photonics Plasma None of these None 35. For shortest wavelength radiation in the Balmer series the value of n is: 2 3 Infinity 5 None 36. Laser can be made by creating: Population inversion Metastable state Assembly All of the above None 37. Operation of laser depends upon: The existence of atoms in metastable state The existence of atoms in ground state The existence of atoms in excited state None of these None 38. Different types of lasers are: Two Three Five None of these None 39. The X- rays exhibit the phenomenon of: Diffraction Interference Polarization All of the above None 40. Quality of x- rays depends upon: Accelerating voltage Filament current Material of the target Both A and C None 1 out of 8 Thanks For Taking This Quiz - Please See Your Answers/Results Below After Entering Your Name & Email... Name Email Time's up
