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Online Tests
Physics Fsc Part 2 Chapter 9 Online Test 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
The X-rays diffraction with crystal was first studied by
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W.H Bragg
W.L. Bragg
Michelson
None of these
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Question # 3
The velocity of electron moving is 1st orbit of hydrogen atom is:
Choose an answer
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
Photons emitted in inner shell transition are.
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Continuous X -rays
Discontinuous X rays
Characteristic X rays
Energetic X rays
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Question # 5
Boher proposed his atomic model in:
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1910
1911
1912
1913
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Question # 6
Laser can be made by creating.
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Meta stable
Population inversion
Excited state
All of these
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Question # 7
If electron jumps from second orbit to first orbit in hydrogen atom it emits photon of.
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3.40 eV
10.20 eV
13.6 eV
3.8 eV
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Question # 8
Target material used in x-rays tube have following properties.
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High atomic number and high melting pouint
High atomic number and low melting pouint
Low atomic number and low melting pouint
High atomic number only
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Question # 9
Energy produced due to fission of uranium atom is:
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500MeV
200MeV
700MeV
750MEV
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Question # 10
The 1
st
Bohr atom in the hydrogen atom has radius
Choose an answer
3.56 x 10
-10
m
0.053 x 10
-11
m
0.53 x 10
-11
m
5.30 x 10
-11
m
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Question # 11
A° is the unit of:
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Energy
Length
Nuclear energy
Work
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Question # 12
An atom can reside in excited state for
Choose an answer
10
-8
second
One second
10
-10
second
More than one second
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Question # 13
Which of the following series of hydrogen spectrum lies in ultra violet region.
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Lyman sereis
Paschen series
Balmar series
Bracket series
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Question # 14
Balmer series lies in region of electromagnetic spectrum.
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Infrared
Visible
Ultraviolet
Fra infrared
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Question # 15
The series in infrared region is:
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Paschen series
Bracket series
Pfund series
All of above
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Question # 16
Frequency of x-rays depends upon.
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Number of electrons striking target
Accelerating potencial
Nature of the target
Both B and C
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Question # 17
The line radiations emitted from by hydrogen filled discharge tube can be analyzed into.
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Band spectrum
Line spectrum
Continuous spectrum
Absorption spectrum
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Question # 18
Balmer series lies in
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Visible region
Invisible region
Ultraviolet region
Infrared region
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