Atomic Structure
PART1 - Multiple Choice Questions
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Diameter of Atom is of order
*
1 point
10^-8 m
10^-10 m
10^8 m
10^-12 m
Diameter of nucleus is of order
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1 point
10^-16 m
10^-12 m
10^-10 m
10^-14 m
Impact parameter is inversely proportional to
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1 point
Angle of Reflection
Angle of Refraction
Angle of Scattering
None
The value of fine structure constant is
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1 point
137
1/137
c/137
137c
Value of Rydberg Constant of Hydrogen is
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1 point
1.09678 m^-1
1.09678 x 10^7 m^-1
1.09678 x 10^7 cm^-1
None
Value of Plancks Constant is
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1 point
6.62 x 10^-34 J/Sec
6.62 x 10^34 J.Sec
6.62 x 10^-34 J.sec
6.62 x 10^34 J/sec
The ratio of charge to mass (e/m) for an electron is measured by
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1 point
Millikan
Sommerfield
Thomson
Planck
Mass of an electron is
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1 point
9.1 x 10^31 Kg
9.1 x 10^-31 gm
9.1 x 10^-31 Kg
9.1 x 10^-30 Kg
Ionization energy of Hydrogen atom is
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1 point
13.6 KeV
1.36 KeV
13.6 eV
1.36 MeV
Lyman series of Hydrogen atom lies in
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1 point
Visible Region
Ultra Voilet region
Infrared region
microwave region
Brackett series lies in
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1 point
Infrared region
Far infrared region
Visible region
Microwave region
Which spectral series of Hydrogen atom lies in visible region
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1 point
Paschen Series
Brackett Series
Pfund Series
Balmer Series
Velocity of electron is independent of its mass
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1 point
True
False
When a Hydrogen atom is raise from ground state to higher state then
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1 point
Kinetic Energy increases and Potential Energy decreases
Kinetic Energy decreases and Potential Energy increases
Kinetic Energy and Potential Energy increases
Kinetic Energy and Potential Energy decreases
To explain his theory, Bohr used
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1 point
Conservation of Momentum
Conservation of Energy
Conservation of Angular Momentum
Conservation of Acceleration
In terms of Bohrs radius r, the radius of second Bohr orbit is
*
1 point
2r
r/2
4r
r/4
If PE & KE represent potential and kinetic energies respectively for orbital electron, then
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1 point
PE=KE
KE=PE/2
KE= -PE
KE= -PE/2
Charge of electron is measured by
*
1 point
Thomson
Millikan
Bohr
Lyman
1 eV =
1 point
9.1 x 10^-31 Joules
1.6 x 10^-19 Joules
6.2 x 10^-34 Joules
1.6 x 10^-34 Joules
Clear selection
Orbital frequency of eletron is inversely proportional to
*
1 point
n^3
n^2
n
1/n
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