Entry Test MCQ :: Atomic Spectra
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11. |
Ground state energy of the 4th orbit in a H-atom is |
A. |
?13.60 eV |
B. |
?3.40 eV |
C. |
?0.85 eV |
D. |
?1.51 eV |
Answer: Option C
Explanation:
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12. |
Total number of series in hydrogen spectrum is |
Answer: Option C
Explanation:
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13. |
The radiations emitted form hydrogen filled discharge tube show |
A. |
band spectrum |
B. |
line spectrum |
C. |
continuous spectrum |
D. |
absorption spectrum |
Answer: Option B
Explanation:
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14. |
The electric P.E of an electron in an orbit at a distance rn from the positive charge |
A. |
Ke2/rn |
B. |
Ke2/rn2 |
C. |
?Ke2/rn |
D. |
?Ke2/rn2 |
Answer: Option C
Explanation:
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15. |
Radiation with wavelength longer than red lights |
A. |
ultraviolet rays |
B. |
X-rays |
C. |
infra red radiation |
D. |
visible radiation |
Answer: Option C
Explanation:
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16. |
Bracket series is obtained when all transition of electron terminate on |
A. |
4th orbit |
B. |
5th orbit |
C. |
3rd orbit |
D. |
2nd orbit |
Answer: Option A
Explanation:
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17. |
In an electronic transition atom cannot emit |
A. |
?-rays |
B. |
infra red radiation |
C. |
visible light |
D. |
ultraviolet rays |
Answer: Option A
Explanation:
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18. |
Reverse process of photoelectric effect is |
A. |
pair production |
B. |
Compton effect |
C. |
annihilation of matter |
D. |
X-rays production |
Answer: Option D
Explanation:
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19. |
X-rays are similar in nature to |
A. |
cathode rays |
B. |
positive rays |
C. |
?-rays |
D. |
?-rays |
Answer: Option C
Explanation:
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20. |
The penetrating power of X-rays depends on their |
A. |
applied voltage |
B. |
frequency |
C. |
source |
D. |
all of the above |
Answer: Option B
Explanation:
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