JEE Questions for Physics Atoms And Nuclei Quiz 22 - MCQExams.com

Order of magnitude of density of uranium nucleus is (mp = 1.67 × 10–27 kg)
  • 1020 kg/m3
  • 1017 kg/m3
  • 1014 kg/m3
  • 1011 kg/m3
Following process is known as hv → e+ + e–
  • Pair production
  • Photoelectric effect
  • Compton effect
  • Zeeman effect
Atomic weight of boron is 10.81 and it has two isotopes 5B10 and 5B11. Then ratio of 5B10 : 5B11 in nature would be
  • 19 : 81
  • 10 : 11
  • 15 : 16
  • 81 : 19
The mass defect per nucleon is called
  • Binding energy
  • Packing fraction
  • Ionisation energy
  • Excitation energy
Nuclear forces are
  • Short ranged attractive and charge independent
  • Short ranged attractive and charge dependent
  • Long ranged repulsive and charge independent
  • Long ranged repulsive and charge dependent
The mass of an α–particle is
  • Less than the sum of masses of two protons and two neutrons
  • Equal to mass of four protons
  • Equal to mass of four neutrons
  • Equal to sum of masses of two protons and two neutrons
If the binding energy per nucleon in Li7 and He4 nuclei are respectively 5.60 MeV and 7.06 MeV, then energyof reaction Li7 + p →22He4 is
  • 19.6 MeV
  • 2.4 MeV
  • 8.4 MeV
  • 17.3 MeV
Mn and Mp represent mass of neutron and proton respectively. If an element having atomic mass M has N-neutrons and Z-protons, then the correct relation will be
  • M <[NMn + ZMp]
  • M >[NMn + ZMp]
  • M =[NMn + ZMp]
  • M n + ZMp]
The mass and energy equivalent to 1 amu are respectively
  • 1.67 × 10–27gm, 9.30 MeV
  • 1.67 × 10–27 kg, 930 MeV
  • 1.67 × 10–27 kg, 1 MeV
  • 1.67 × 10–34 kg, 1 MeV
As compared 12C atom, 14C atom has
  • Two extra protons and two extra electrons
  • Two extra protons but no extra electrons
  • Two extra neutrons and no extra electrons
  • Two extra neutrons and two extra electrons
Two protons exert a nuclear force on each other, the distance between them is
  • 10–14 m
  • 10–10 m
  • 10–12 m
  • 10–8 m
If m, mn, and mpare the masses of ZXA nucleus,neutron and proton respectively, then
  • m <(A – Z)mn + Zmp
  • m = (A – Z)mn + Zmp
  • m = (A – Z)mp + Zmn
  • m >(A – Z)mn + Zmp
The mass defect in a particular nuclear reaction is 0.3 grams. The amount of energy liberated in kilowatt hours is (Velocity of light = 3 × 108 m/s)
  • 1.5 × 106
  • 2.5 × 106
  • 3 × 106
  • 7.5 × 106
On the bombardment of neutron with Boron. a-particle is emitted and product nuclei formed is
  • 6C12
  • 3Li6
  • 3Li7
  • 4Be9
The process by which a heavy nucleus splits into light nuclei is known as
  • Fission
  • α– decay
  • Fusion
  • Chain reaction
In a working nuclear reactor, cadmium rods (controlrods) are used to
  • Speed up neutrons
  • Slow down neutrons
  • Absorb some neutrons
  • Absorb all neutrons
In a fission process, nucleus A divides onto two nuclei B and C, their binding energies being Ea Eband Ecrespectively. Then
  • Eb + Ec = Ea
  • Eb + Ec> Ea
  • Eb + Ec< Ea
  • Eb • Ec = Ea
A reaction between a proton and 8O18that produces 9F18 must also liberate
  • 0n1
  • 1e0
  • 1n0
  • 0e1
In the nuclear reaction 92U238→ZThA +2He4, the values of A and Z are
  • A = 234, Z = 94
  • A = 234, Z = 90
  • A = 238, Z = 94
  • A = 238, Z = 90
If 200 MeV energy is released in the fission of a single U235 nucleus, the number of fissions required per second to produce 1 kilowatt power shall be (Given 1 eV = 1.6 × 10–19 J)
  • 3.125 × 1013
  • 3.125 × 1014
  • 3.125 × 1015
  • 3.125 × 1016
Complete the equation for the following fission process 92U225 + 0n1 → 38Sr90 + …
  • 54Xe143 + 30n1
  • 54Xe145
  • 57Xe142
  • 54Xe142 + 0n1
In nuclear fission, the fission reactions proceeds with a projectile. Which of the following suits the best
  • Slow proton
  • Fast neutron
  • Slow neutron
  • None of these
The nucleus which has radius one-third of the radius of Cs189 is
  • Be9
  • Li7
  • F19
  • C12
  • O16
In the nuclear reaction 85X297→ Y + 4α, Y is
  • 76Y287
  • 77Y285
  • 77Y281
  • 77Y289
In the following reaction
12Mg24 + 2SiX + 0n1 is
  • 28
  • 27
  • 26
  • 22
In the nudear reaction 6C11 → 5B11 + β+ X, what doesX stand for
  • An electron
  • A proton
  • A neutron
  • A neutrino
The operation of a nuclear reactor is said to be critical, if the multiplication factor (k) has a value
  • 1
  • 1.5
  • 2.1
  • 2.5
Which one of the following nuclear reactions is a source of energy in the sun?

  • Physics-Atoms and Nuclei-63738.png
  • 2)
    Physics-Atoms and Nuclei-63739.png

  • Physics-Atoms and Nuclei-63740.png

  • Physics-Atoms and Nuclei-63741.png
Heavy water is used as moderator in a nuclear reactor. The function of the moderator is
  • To control the energy released in the reactor
  • To absorb neutrons and stop chain reaction
  • To cool the reactor faster
  • To slow down the neutrons to thermal energies
Nuclear fission experiments show that the neutrons split the uranium nuclei into two fragments of about same size. This process is accompanied by the emission of several
  • Protons and positrons
  • α–particles
  • Neutrons
  • Protons and α–particles
1H1 + 1H1 + 1H2 → X + +1e0 + energy. The emitted particle is
  • Neutron
  • Proton
  • α–particle
  • Neutrino
A free neutron decays into a proton, an electron and
  • A neutrino
  • An antineutrino
  • An alpha particle
  • A beta particle
Which of the following is used as a moderator in nuclear reactors?
  • Uranium
  • Heavy water
  • Cadmium
  • Plutonium
If a proton and anti-proton come close to each other and annihilate, how much energy will be released
  • 1.5 × 10–10 J
  • 3 × 10–10 J
  • 4.5 × 10–10 J
  • None of these
Which of these is a fusion reaction?

  • Physics-Atoms and Nuclei-63745.png
  • 2)
    Physics-Atoms and Nuclei-63746.png

  • Physics-Atoms and Nuclei-63747.png
  • None of the above

Physics-Atoms and Nuclei-63748.png
  • B.E = [M (A, Z) – ZMp– (A – Z)Mn]C2
  • B.E = [ZMp+ (A – Z)Mn– M (A, Z)]C2
  • B.E = [ZMp+ AMn– M (A, Z)]C2
  • B.E = M (A, Z ) –ZMp–(A – Z)Mn
Hydrogen bomb is based on which of the following phenomenon
  • Nuclear fission
  • Nuclear fusion
  • Radioactive decay
  • None of these
The number of neutrons released when 92U235undergoes fission by absorbing 0n1 and (56Ba144+ 36Kr89)are formed, is
  • 0
  • 1
  • 2
  • 3
Which of the following particle has similar mass to electron?
  • Proton
  • Neutron
  • Positron
  • Neutrino
Boron rods in nuclear reactor are used as a
  • Moderator
  • Control rods
  • Coolants
  • Protective shield
If the energy released in the fission of one nucleus is 200 MeV then the number of nuclei required per second in a power plant of 16 kW will be
  • 0.5 × 1014
  • 0.5 × 1012
  • 5 ×1012
  • 5 × 1014
Neutrino is a particle, which is
  • Charged and has spin
  • Charged and has no spin
  • Charge less and has spin
  • Charge less and has no spin
The average number of prompt neutrons produced perfission of U235 is
  • More than 5
  • 3 to 5
  • 2 to 3
  • 1 to 2
In the nuclear reaction X(n, α)3Li7 the term X will be
  • 5B10
  • 5B9
  • 5B11
  • 2He4
In an atomic bomb, the energy is released due to
  • Chain reaction of neutrons and 92U235
  • Chain reaction of neutrons and 92U238
  • Chain reaction of neutrons and 92U240
  • Chain reaction of neutrons and 92U236
If an electron and a positron annihiliate, then the energy released is
  • 3.2 × 10–13 J
  • 1.6 × 10–13 J
  • 4.8 × 10–13 J
  • 6.4 × 10–13 J
The binding energy per nucleon of deuterium and helium atom is 1.1 MeV and 7.0 MeV. If two deuterium nuclei fuse to form helium atom, the energy released is
  • 19.2 MeV
  • 23.6 MeV
  • 26.9 MeV
  • 13.9 MeV
In a material medium, when a positron meets an electron both the particles annihilate leading to the emission of two gamma ray photons. This process forms the basis of an important diagnostic procedure called
  • MRI
  • PET
  • CAT
  • SPECT
In the following reaction the value of \'X\' is
7N14 + 2He4 → X + 1H1
  • 8N17
  • 8O17
  • 7O16
  • 7N16
A πo at rest decays into 2γ rays, πo→γ + γ. Then whichof the following can happen
  • The two γ's move in same direction
  • The two γ's move in opposite direction
  • Both repel each other
  • Both attract each other
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Physics Quiz Questions and Answers