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Online Tests
Ics Part 2 Physics Chapter 9 Test Online MCQs With Answers
Question # 1
The Balmer series is obtained when all the transition of electrons terminate on
Choose an answer
1
st
orbit
2nd orbit
3rd orbit
4th orbit
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Question # 2
Hydrogen atom spectrum does not lie in
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Ultraviolet region
Visible region
Infrared region
X ray region
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Question # 3
The velocity of electron moving is 1st orbit of hydrogen atom is:
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2.09 x 10
6
ms
-1
2.18 x10
6
ms
-1
2.19 x 10
6
ms
-1
3.18 x10
6
ms
-1
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Question # 4
The first spectral lines were discovered in 1885, were
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Paschen series
Balmer series
Pfund series
Bracket series
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Question # 5
The shortest wave length is Bracket series has wave length.
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16/Rn
Rn/16
16 Rn
4 Rn
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Question # 6
For an atom of hydrogen atom the radius of the first orbit is given by:
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H/me
2
me/4h
2
h2/4
π
2
kme
2
h
2
me
2
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Question # 7
Which series lies in the ultraviolet region.
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Balmer series
Bracket series
Ptund series
Lyman series
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Question # 8
Production of x rays is reverse process of
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Photo electric effect
Compton effect
An nihilation
Pair production
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Question # 9
Study of hydrogen visible spectrum in
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1886
1887
1895
1885
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Question # 10
The typical nuclei are less than:
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10
-16
m
10
-14
m
10
-12
m
10
-10
m
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Question # 11
When meta I is heated sufficiently electrons are given off by the metal. This phenomenon is known as.
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Photoelectric effect
Piezo electric effect
Thermionic emission
Secondary emission
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Question # 12
Energy produced due to fission of uranium atom is:
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500MeV
200MeV
700MeV
750MEV
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Question # 13
The radius of hydrogen atom is:
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0.53A°
0.053A°
0.53 x 10
-9
0.053 x10
-9
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Question # 14
In Helium Neon laser, discharge tube is filled with Neon gas.
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10%
15%
85%
90%
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Question # 15
If the ionization energy of hydrogen atom is 13.6 eV, its ionization potential will be
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136.0 volt
3.0 volt
13.6 volt
None of these
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Question # 16
In an electronic transition atom cannot emit.
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Infrared radiations
Visible radiations
Ultraviolet radiations
Gama radiations
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Question # 17
The first orbit in the hydrogen atom has a radius.
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0.53 nm
0.053 nm
0.0053 nm
0.00053 nm
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Question # 18
Laser can be made by creating.
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Meta stable
Population inversion
Excited state
All of these
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