JEE Questions for Physics Atoms And Nuclei Quiz 10 - MCQExams.com

In Bohr\'s model of hydrogen atom, which of the following pairs of quantities are quantized?
  • Energy and linear momentum
  • Linear and angular momentum
  • Energy and angular momentum
  • None of the above
The energy of the highest energy photon of Balmer series of hydrogen spectrum is close to
  • 13.6 eV
  • 3.4 eV
  • 1.5 eV
  • 0.85 eV
An electron changes its position from orbit n = 4 to the orbit n = 2 of an atom. The wavelength of the emitted radiation is (R = Rydberg\'s constant)

  • Physics-Atoms and Nuclei-62856.png
  • 2)
    Physics-Atoms and Nuclei-62857.png

  • Physics-Atoms and Nuclei-62858.png

  • Physics-Atoms and Nuclei-62859.png
If the energy of a hydrogen atom in nth orbit is En, then energy in the nth orbit of a singly ionized helium atom will be
  • 4En
  • En/4
  • 2En
  • En/2
What is the ratio of wavelength of radiations emitted when an electron in hydrogen atom jumps from fourth orbit to second orbit and from third orbit to second orbit?
  • 27 : 25
  • 20 : 27
  • 20 : 25
  • 25 : 27

Physics-Atoms and Nuclei-62863.png
  • 910 Å,1213 Å
  • 5463 Å, 7858 Å
  • 1315 Å, 1530 Å
  • None of these
What is the ground state energy of positronium?
  • 13.6 eV
  • 27.2 eV
  • 5.4 eV
  • 1.8 eV
The transition of an electron from n2 = 5, 6,... to n1. = 4 gives rise to
  • Pfund series
  • Lyman series
  • Paschen series
  • Brackett series
White light is passed through a dilute solution of potassium permanganate. The spectrum produced by the emergent light is
  • Band emission spectrum
  • Line emission spectrum
  • Band absorption spectrum
  • Line absorption spectrum
In hydrogen atom, the electron is moving round the nucleus with velocity 2.18 × 106 m/s in an orbit of radius 0.528 Å. The acceleration of the electron is
  • 9 × 1018 m/s
  • 9 × 1022 m/s
  • 9 × 10–22 m/s
  • 9 × 1012 m/s
The ionization energy of Li++ is equal to
  • 9 hcR
  • 6 hcR
  • 2 hcR
  • 0 hcR
Electrons in a certain energy level n = n1, can emit 3 spectral lines. When they are in another energy level, n = n2. They can emit 6 spectral lines. The orbital speed of the electrons in the two orbits are in the ratio
  • 4 : 3
  • 3 : 4
  • 2 : 1
  • 1 : 2
The largest wavelength in the ultraviolet region of the hydrogen spectrum is 122 nm. The smallest wavelength in the infrared region of the hydrogen spectrum (to the nearest integer is)
  • 802 nm
  • 823 nm
  • 1882 nm
  • 1648 nn
The number of electrons, neutrons and protons in a species are equal to 10, 8 and 8 respectively. The proper symbol of he species is

  • Physics-Atoms and Nuclei-62869.png
  • 2)
    Physics-Atoms and Nuclei-62870.png

  • Physics-Atoms and Nuclei-62871.png

  • Physics-Atoms and Nuclei-62872.png

  • Physics-Atoms and Nuclei-62873.png
The shortest wavelength in hydrogen spectrum of Lyman series when RH = 109678 cm–1 is
  • 1002.7 Å
  • 1215.67 Å
  • 1127.30 Å
  • 911.7 Å
  • 1234.7 Å
The wavelength of the first spectral line in the Balmer series of hydrogen atom is 6561 Å. The wavelength of the second spectral line in the Balmer series of singly ionized helium atom is
  • 1215 Å
  • 1640 Å
  • 2430 Å
  • 4687 Å
Energy required for the electron excitation in Le++ from the first to the third Bohr orbit is
  • 12.1 eV
  • 36.3 eV
  • 108.8 eV
  • 122.4 eV
It is easier to ionize hydrogen as compared to deuterium, because
  • Hydrogen is lighter than deuterium
  • Atomic number of hydrogen is lesser than deuterium
  • Hydrogen is a diatomic gas
  • The statements is wrong
Hydrogen atom is excited from ground state to another state with principal quantum number equal to 4. Then the number of spectral lines in the emission spectra will be
  • 2
  • 3
  • 5
  • 6
β decay means emission of electron from
  • Innermost electron orbit
  • A stable nucleus
  • Outermost electron orbit
  • Radioactive nucleus
The neutron was discovered by
  • Marie Curie
  • Pierre Curie
  • James Chadwick
  • Rutherford
The energy equivalent of 1 kilogram of matter is about
  • 10–15 J
  • 1 J
  • 10–12 J
  • 1017 J
Nuclear binding energy is equivalent to
  • Mass of proton
  • Mass of neutron
  • Mass of nucleus
  • Mass defect of nucleus
If the binding energy of the deuterium is 2.23 MeV. The mass defect given in a.m.u. is
  • –0.0024
  • –0.0012
  • 0.0012
  • 0.0024
Which of the following has the mass closest in value to that of the positron?
  • Proton
  • Electron
  • Photon
  • Neutrino
The mass defect for the nucleus of helium is 0.0303 amu. What is the binding energy per nucleon for helium in MeV?
  • 28
  • 7
  • 4
  • 1
Hydrogen atom from excited state comes to the ground state by emitting a photon of wavelength λ. If R is the Rydberg constant, the principal quantum number n of the excited state is

  • Physics-Atoms and Nuclei-62884.png
  • 2)
    Physics-Atoms and Nuclei-62885.png

  • Physics-Atoms and Nuclei-62886.png

  • Physics-Atoms and Nuclei-62887.png
One milligram of matter converted into energy will give
  • 90 J
  • 9 × 103 J
  • 9 × 1010 J
  • 9 × 105 J
The average binding energy per nucleon in the nucleus of an atom is approximately
  • 8 eV
  • 8 KeV
  • 8 MeV
  • 8 J
Which of the following pairs is an isobar ?
  • 1H1 and 1H2
  • 1H2 and 1H3
  • 6C12 and 6C13
  • 15P30 and 14Si30
The mass number of a nucleus is equal to the number of
  • Electrons it contains
  • Protons it contains
  • Neutrons it contains
  • Nucleons it contains
The rest energy of an electron is
  • 510 KeV
  • 931 KeV
  • 510 MeV
  • 931 MeV
In 88Ra226 nucleus, there are
  • 138 protons and 88 neutrons
  • 138 neutrons and 88 protons
  • 226 protons and 88 electrons
  • 226 neutrons and 138 electrons
The mass of a neutron is the same as that of
  • A proton
  • A meson
  • An epsilon
  • An electron
π masons can be
  • π+ or π–-
  • π+ or πo
  • π– or πo
  • π+, π– or πo
In helium nucleus, there are
  • 2 protons and 2 electrons
  • 2 neutrons, 2 protons and 2 electrons
  • 2 protons and 2 neutrons
  • 2 positrons and 2 protons
Antiparticle of electron is
  • 0n1
  • 1H1
  • Positron
  • Neutrino
What is the particle x in the following nuclear reaction
Physics-Atoms and Nuclei-62894.png
  • Electron
  • Proton
  • Photon
  • Neutron
If the binding energy per nucleon in Li7 and He4 nuclei are respectively 5.60 MeV and 7.06 MeV, then energy of reaction Li7 + p → 22He4 is
  • 19.6 MeV
  • 2.4 MeV
  • 8.4 MeV
  • 17.3 MeV
The mass number of He is 4 and that for sulphur is 32. The radius of sulphur nucleus is larger than that of helium, by times

  • Physics-Atoms and Nuclei-62897.png
  • 4
  • 2
  • 8
Energy of 1 g uranium is equal to
  • 9.0 × 1013 J
  • 9.0 × 1019 J
  • 3.0 × 1016 J
  • 3.0 × 1017 J

Physics-Atoms and Nuclei-62900.png
  • 200 KeV
  • 2 MeV
  • 200 MeV
  • 2000 MeV
Atomic number of a nucleus is Z and atomic mass is M. The number of neutron is
  • M – Z
  • M
  • Z
  • M + Z
The force acting between proton and proton inside the nucleus is
  • Coulombic
  • Nuclear
  • Both
  • None of these
For a nucleus to be stable, the correct relation between neutron number N and proton number Z is
  • N > Z
  • N = Z
  • N < Z
  • N ≥ Z
If a H2 nucleus is completely converted into energy, the energy produced will be around
  • 1 MeV
  • 938 MeV
  • 9.38 MeV
  • 238 MeV
The radius of a nucleus of a mass number A is directly proportional to
  • A3
  • A
  • A2/3
  • A1/3

Physics-Atoms and Nuclei-62905.png
  • 11 electrons
  • 12 protons
  • 23 protons
  • 12 neutrons
Pick out the correct statement from the following
  • Energy released per unit mass of the reactant is less in case of fusion reaction
  • Packing fraction may be positive or may be negative
  • Pu239 is not suitable for a fission reaction
  • For stable nucleus, the specific binding energy is low
The average kinetic energy of the thermal neutrons is of the order of
  • 0.03 eV
  • 3 eV
  • 3 KeV
  • 3 MeV
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Physics Quiz Questions and Answers