Lines of Pfund series are obtained when an electron jumps from higher orbit to ----- orbit;

1. 2nd
2. 3rd
3. 4th
4. 5th
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Answer: D
Explanation:
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The ratio of the radii of second and first orbit of H-atom according to Bohr's model is;

1. 2:1
2. 1:2
3. 4:1
4. 1:4
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Answer: C
Explanation:
• Since 4r : 1r = 4:1
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The idea of stationary orbit was given by:

1. Rutherford
2. J.J Thomson
3. Max Planck
4. Neil Bohr
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Answer: D
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Splitting of spectral lines under the influence of strong electric field is called:

1. Zeeman effect
2. Stark effect
3. photoelectric effect
4. Compton effect
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Answer: B
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When source emmiting spectral lines is placed in a strong magnetic field, the spectral lines split into components. This effect is called;

1. Zeeman effect
2. Stark effect
3. photoelectric effect
4. Compton effect
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Answer: A
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The effect of electric field on the spectra of atoms is called;

1. Zeeman effect
2. Stark effect
3. photoelectric effect
4. Compton effect
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Answer: B
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The energy of an electron in the first Bohr orbit of H-atom is;

1. 13.6 ev
2. -1.36 ev
3. -13.6 ev
4. 1.36 ev
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Answer: C
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Who gave the concept ofelliptical orbits;

1. Rutherford
2. Sommerfeld
3. Max Planck
4. Neil Bohr
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Answer: B
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Nobel gases are inert and have most stable electronic configuration as they contain;

1. fully filled outermost shell
2. half filled outermost shell
3. two electrons in the outermost shell
4. eight electrons in the outermost shell
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Answer: D
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Who put forward the first elaborte scheme of the arrangement of extranuclear electrons in 1911?

1. Bohr
2. Bury
3. Langmuir
4. Sommerfeld
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Answer: C
Explanation:
• First scheme was given by Langmuir and then it was modified by Bohr and Bury in 1921 called Bohr-Bury scheme.
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