In discharge tube, helium glows with colour;

1. red
2. pink
3. orange red
4. yellow
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Answer: B
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When spectrum contains bright lines against dark background, it is called;

1. Atomic absorption spectrum
2. atomic emmision spectrum
3. continuous spectrum
4. none of these
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Answer: B
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When spectrum contains dark lines against bright background, it is called;

1. Atomic absorption spectrum
2. atomic emmision spectrum
3. continuous spectrum
4. none of these
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Answer: A
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When white light is passed through a sample of gaseous element and the element absorbs certain walengths, then it gives;

1. Atomic absorption spectrum
2. atomic emmision spectrum
3. continuous spectrum
4. none of these
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Answer: A
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In atomic emmision spectrum, electrons;

1. jump from lower to higher energy level
2. jump from higher to lower energy level
3. remain in the same energy level
4. may excite or de-excite
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Answer: B
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In atomic absorption spectrum, electrons;

1. jump from lower to higher energy level
2. jump from higher to lower energy level
3. remain in the same energy level
4. may excite or de-excite
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Answer: A
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The positions or wavelengths of bright lines in the emission spectrum and dark lines in the absortion spectrum are;

1. always different
2. may be same or different
3. exactly the same
4. variable parameters
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Answer: C
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Atomic spectral lines are emitted or absorbed in the region:

1. Visible
2. Infra red
3. Ultraviolet
4. All of these
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Answer: D
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Atomic spectrum depends upon:

1. number of valence electrons
2. internal structure of the atom
3. size of atoms
4. none of these
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Answer: B
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In 1884 J.J. Balmer observed that hydrogen spectrum consists of ---- prominent colours in the visible region:

1. two
2. three
3. four
4. seven
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Answer: C
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