Entry Test MCQ :: Atomic Spectra
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1. |
Ratio of the weight of H-atom to that of an electron is approximately |
Answer: Option B
Explanation:
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2. |
Photon of highest frequency will be absorbed when transition takes place from |
A. |
1st to 5th orbit |
B. |
2nd to 5th orbit |
C. |
3rd to 5th orbit |
D. |
4th to 5th orbit |
Answer: Option A
Explanation:
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3. |
In hydrogen spectrum which one of the following series lies in the ultraviolet region? |
A. |
Balmer series |
B. |
Pfund series |
C. |
Bracket series |
D. |
Lymann series |
Answer: Option D
Explanation:
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4. |
In obtaining an X-ray photograph of our hand we use the principle of |
A. |
photo electric effect |
B. |
ionization |
C. |
shadow photograph |
D. |
any of above |
Answer: Option C
Explanation:
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5. |
Excited atoms return to their ground state in |
Answer: Option B
Explanation:
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6. |
When we excite some atoms by heat collision or electrical discharge they will |
A. |
radiate electromagnetic energy with a continuous distribution of wavelength |
B. |
absorb particular wavelengths when white light is incident on them |
C. |
radiate electromagnetic energy of discrete characteristic wavelength |
D. |
emit either invisible or visible light |
Answer: Option C
Explanation:
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7. |
Hydrogen atom does not emit X-rays because |
A. |
its energy levels are too close to each other |
B. |
its energy levels are too far apart |
C. |
it is too small in size |
D. |
it has a single electron |
Answer: Option D
Explanation:
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8. |
Which one of following postulate is in accordance with the Rutherfords model? |
A. |
continuous spectra for atoms |
B. |
discrete spectra for atoms |
C. |
either continuous nor discrete |
D. |
no spectrum |
Answer: Option A
Explanation:
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9. |
X-ray are |
A. |
of unknown nature |
B. |
high energy electrons |
C. |
high energy photons |
D. |
radio isotopes |
Answer: Option C
Explanation:
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10. |
Tick the correct statement |
A. |
an atom has limited number of ionization potentials but a large number of excitation potentials |
B. |
there are as many excitation potentials as there are excited states |
C. |
the difference between the energy of the ground sate and any one of the excited states is the measure of excitation energy |
D. |
all of above |
Answer: Option D
Explanation:
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