JEE Questions for Physics Atoms And Nuclei Quiz 11 - MCQExams.com

The control rod in a nuclear reactor is made of
  • Uranium
  • Cadmium
  • Graphite
  • Plutonium
The explosion of the atomic bomb takes place due to
  • Nuclear fission
  • Nuclear fusion
  • Scattering
  • Thermionic emission
In nuclear reaction
2He4 + zXA → z + 2 YA + 3 + A, A denotes
  • Electron
  • Positron
  • Proton
  • Neutron
Energy generation in stars is mainly due to
  • Chemical reactions
  • Fission of heavy nuclei
  • Fusion of light nuclei
  • Fusion of heavy nuclei
If the speed of light were 2/3 of its present value, the energy released in a given atomic explosion will be decreased by a fraction
  • 2/3
  • 4/9
  • 3/4
  • 5/9
Atom bomb consists of two pieces of 92U235 and a source of
  • Proton
  • Neutron
  • Meson
  • Electron
Most suitable element for nuclear fission is the element with atomic number near
  • 11
  • 21
  • 52
  • 92
In nuclear reactions, we have the conservation of
  • Mass only
  • Energy only
  • Momentum only
  • Mass, energy and momentum
According to the quark model, it is possible to build all the hadrons using
  • 2 quarks and 3 antiquarks
  • 3 quarks and 2 antiquarks
  • 3 quarks and 3 antiquarks
  • 2 quarks and 2 antiquarks
Which of the following statements is true?
  • 78Pt192 has 78 neutrons
  • 84Po214 → 82Pb210 + β–
  • 92U238 → 90Th234 + 2He4
  • 90Th234 → 91Pa234 + 2He4
What was the fissionable material used in bomb dropped at Nagasaki (Japan) in the year 1945?
  • Uranium
  • Neptunium
  • Berkelium
  • Plutonium
A nuclear bomb exploded 200 km above the surface of moon. The sound of explosion on the moon
  • Will be heard before the explosion is seen
  • Will be heard at the same time
  • Will be heard after explosion
  • Will not be heard at all
Fast neutrons can easily be slowed down by
  • The use of lead shielding
  • Passing them through water
  • Elastic collisions with heavy nuclei
  • Applying a strong electric field
The mass equivalent of 931 MeV energy is
  • 1.66 × 10–27 kg
  • 6.02 × 10–24 kg
  • 1.66 × 10–20 kg
  • 6.02 × 10–27 kg
When 92U235 undergoes fission, 0.1% of its original mass is changed into energy. How much energy is released if 1 kg of 92U235 undergoes fission
  • 9 × 1010 J
  • 9 × 1011 J
  • 9 × 1012 J
  • 9 × 1013 J
γ-rays radiation can be used to create electron-positron pair. In this process of pair production, γ-rays energy cannot be less than
  • 5.0 MeV
  • 4.02 MeV
  • 15.0 MeV
  • 1.02 MeV
A reaction between a proton and 8O18 that produces 9F18 must also liberate
  • 0n1
  • 1e0
  • 1n0
  • 0e1

Physics-Atoms and Nuclei-62913.png
  • An oxygen nucleus with mass 17
  • An oxygen nucleus with mass 16
  • A nitrogen nucleus with mass 17
  • A nitrogen nucleus with mass 16

Physics-Atoms and Nuclei-62914.png
  • 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
A chain reaction is continuous due to
  • Large mass defect
  • Large energy
  • Production of more neutrons in fission
  • None of the above
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
When two deuterium nuclei fuse together to form a tritium nuclei, we get a
  • Neutron
  • Deutron
  • α - particle
  • Proton
1 g of hydrogen is converted into 0.993 g of helium in a thermonuclear reaction. The energy released is
  • 63 × 107 J
  • 63 × 1010 J
  • 63 × 1014 J
  • 63 × 1020 J

Physics-Atoms and Nuclei-62919.png

  • Physics-Atoms and Nuclei-62920.png
  • 2)
    Physics-Atoms and Nuclei-62921.png

  • Physics-Atoms and Nuclei-62922.png

  • Physics-Atoms and Nuclei-62923.png

Physics-Atoms and Nuclei-62925.png
  • 28
  • 27
  • 26
  • 22
Thermal neutrons can cause fission in
  • U235
  • U238
  • Pu238
  • Th232

Physics-Atoms and Nuclei-62927.png
  • An electron
  • A proton
  • A neutron
  • A neutrino
The energy released in a typical nuclear fusion reaction is approximately
  • 25 MeV
  • 200 MeV
  • 800 MeV
  • 1050 MeV
1H1 + 1H1 + 1H2 → X + +1e0 + energy. The emitted particle is
  • Neutron
  • Proton
  • α - particle
  • Neutrino
The most stable particle in Baryon group is
  • Proton
  • Lamda- particle
  • Neutron
  • Omega- particle
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
Best neutron moderator is
  • Beryllium oxide
  • Pure water
  • Heavy water
  • Graphite
Nuclear fission was discovered by
  • Ottohann and F. Strassmann
  • Fermi
  • Bethe
  • Rutherford
In nuclear fission the percentage of mass converted into energy is about
  • 10%
  • 0.01%
  • 0.1%
  • 1%
Light energy emitted by stars is due to
  • Breaking of nuclei
  • Joining of nuclei
  • Burning of nuclei
  • Reflection of solar light
The nuclear reactor at Kaiga is a
  • Fusion reactor
  • Research reactor
  • Power reactor
  • Breeder reactor
In a nuclear reactor, the fuel is consumed at the rate of 1 mg/s. The power generated in kilowatt is
  • 9 × 104
  • 9 × 107
  • 9 × 108
  • 9 × 1012
What is used as a moderator in a nuclear reactor?
  • Water
  • Graphite
  • Cadmium
  • Steel
A nucleus is bombarded with a high speed neutron so that resulting nucleus is a radioactive one. This phenomenon is called
  • Artificial radioactivity
  • Fusion
  • Fission
  • Radioactivity
Which of the following cannot cause fission in a heavy nucleus?
  • α -particle
  • Proton
  • Deutron
  • Laser rays
Isobars are formed by
  • α - decay
  • β - decay
  • γ - decay
  • h-decay
Using the following data
mass of hydrogen atom = 1.00783 u
mass of neutron = 1.00867 u
mass of nitrogen atom (7N14) = 14.00307 u
the calculated value of the binding energy of the nucleus of the nitrogen atom (7N14) is close to
  • 56 MeV
  • 98 MeV
  • 104 MeV
  • 112 MeV
An electron is
  • Hadron
  • Baryon
  • A nucleon
  • A lepton
If the radius of a nucleus of mass number 3 is R, then the radius of a nucleus of mass number 81 is
  • 3R
  • 9R
  • (27)1/2R
  • 27R
The energy equivalent of 1 mg of matter in MeV is
  • 56.25 × 1022
  • 56.25 × 1024
  • 56.25 × 1026
  • 56.25 × 1028
If the binding energy per nucleon of deuteron is 1.115 MeV, its mass defect in atomic mass unit is
  • 0.0048
  • 0.0024
  • 0.0012
  • 0.0006
  • 2.230
Radioactive substances do not emit
  • Electron
  • Helium nucleus
  • Positron
  • Proton
In a radioactive substance at t = 0, the number of atoms is 8 × 104. Its half life period is 3 years. The number of atoms 1 × 104 will remain after interval
  • 9 years
  • 8 years
  • 6 years
  • 24 years
Some radioactive nucleus may emit
  • Only one α, β or γ at a time
  • All the three α, β and γ one after another
  • All the three α, β and γ simultaneously
  • Only α and β simultaneously
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