Entry Test MCQ :: Atomic Structure
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| 41. |
Electronic configuration of K is |
| A. |
[Ar]4s2 |
B. |
[Ar]4s1 |
| C. |
[Kr]5s1 |
D. |
[He]2s1 |
Answer: Option B
Explanation:
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| 42. |
____________ can expel proteons from paraffins |
| A. |
Electron |
B. |
Positron |
| C. |
Neutron |
D. |
None of above has such capability |
Answer: Option C
Explanation:
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| 43. |
Milikan used __________ in his atomizer |
Answer: Option C
Explanation:
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| 44. |
Centrifugal forces are balanced in atom by |
| A. |
Attractive forces |
B. |
Repulsive force |
| C. |
Electrons |
D. |
Neutrons |
Answer: Option A
Explanation:
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| 45. |
Spectrum is produced due to |
| A. |
Different wavelength |
B. |
Different colours |
| C. |
Different intensities |
D. |
all have little contribution |
Answer: Option A
Explanation:
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| 46. |
When 6d orbital is complete the entering electron goes into |
Answer: Option C
Explanation:
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| 47. |
When electron jump into orbit 1 then series obtained is |
| A. |
Lyman |
B. |
Paschen |
| C. |
Pfund |
D. |
Brackett |
Answer: Option A
Explanation:
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| 48. |
Neutrons moving with an energy of 1.2 MeV are called |
| A. |
Fast neutrons |
B. |
Slow neutrons |
| C. |
Moderate neutrons |
D. |
All are possible |
Answer: Option A
Explanation:
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| 49. |
Splitting of spectral lines when atoms are subjected to strong electric filed is called |
| A. |
Zeeman effect |
B. |
Stark effect |
| C. |
Photoelectric effect |
D. |
Compton effect |
Answer: Option B
Explanation:
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| 50. |
Three quantum number have been derived from equation of |
| A. |
de-Broglie |
B. |
Plancks |
| C. |
Schrodinger |
D. |
Heisenberg |
Answer: Option C
Explanation:
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