Atomic Spectra Mcqs
Our collections of Multiple choice questions and answers focuses on study of Atomic Spectra in Physics. These questions are chosen from a collection of most authoritative and best reference books on Physics. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, MDCAT, Teaching jobs Tests and Chemical industry job interviews. One should practice our Mcqs to assimilate knowledge on Atomic Spectra in Physics comprehensively.
32. UV radiation can be produced by
Heating the filament.
Electron excitation in the gas.
Ionization of atoms.
All the above.
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33. Wave-like characteristic of electron is demonstrated by
Line spectrum of atoms.
Production of x-rays.
Diffraction by crystalline solids.
Photoelectric effect.
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34. What is the velocity of a particle of mass m & de-Broglie wavelength ??
H/m?
2h/m?
Mh/h
(2hc/m?)1/2
35. When we excite some atoms by heat collision or electrical discharge they will
Radiate electromagnetic energy with a continuous distribution of wavelength
Absorb particular wavelengths when white light is incident on them
Radiate electromagnetic energy of discrete characteristic wavelength
Emit either invisible or visible light
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36. When X-rays are passed through successive aluminum sheets what happens to their thickness?
Increases
It decreases
It remains same
Sometimes increases and sometimes decreases
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37. Which one of following postulate is in accordance with the Rutherfords model?
Continuous spectra for atoms
Discrete spectra for atoms
Either continuous nor discrete
No spectrum
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38. X-ray are
Of unknown nature
High energy electrons
High energy photons
Radio isotopes
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39. X-rays are diffracted by a crystal but not by a diffraction grating because
The ions in a crystal are well arranged.
The lines in a diffraction grating cannot reflect X-rays.
The penetration power of X-rays is high in a diffraction grating.
The wavelengths of X-rays are of the same order of magnitude as the separation between atoms in a crystal
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40. X-rays are similar in nature to
Cathode rays
Positive rays
?-rays
?-rays