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Total Questions : 807 | Page 78 of 81 pages
Question 771. 4. The energy required to be applied to a radioactive nucleus for the emission of a neutron is
  1.    1 MeV
  2.    2.4 MeV
  3.    4.3 MeV
  4.    7.8 MeV
 Discuss Question
Answer: Option D. -> 7.8 MeV
Question 772. 3. Reflector in nuclear plants is used to
  1.    Return the neutrons back into the core
  2.    ShIeld the radioactivity completely
  3.    Check polllution
  4.    Conserve energy
 Discuss Question
Answer: Option A. -> Return the neutrons back into the core
Question 773. 5. Which of the following are ferrite materials
  1.    U233 and pu239
  2.    U238 and Th232
  3.    U238 and pu239
  4.    U238 and Th239
 Discuss Question
Answer: Option B. -> U238 and Th232
Question 774. 6. Ferrite material is
  1.    The most fissionable material
  2.    The basic fuel for nuclear paints
  3.    Basic raw material for nuclear plants
  4.    The material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material
 Discuss Question
Answer: Option D. -> The material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material
Question 775. 7. Which of the following particles is the lightest
  1.    Nucleus
  2.    Electron
  3.    Proton
  4.    Meson
 Discuss Question
Answer: Option B. -> Electron
Question 776. 8. Which of the following is the heaviest
  1.    Neutron
  2.    Proton
  3.    Atom
  4.    Electron
 Discuss Question
Answer: Option C. -> Atom
Question 777. 9. In fast breeder reactors
  1.    Any type of moderator can be used
  2.    Moderator is dispensed with.
  3.    Heavy water is used as the moderator
  4.    Moderator may or may not be used
 Discuss Question
Answer: Option B. -> Moderator is dispensed with.
Question 778. 1. The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is
  1.    Same
  2.    Lower
  3.    Higher
  4.    Unity
 Discuss Question
Answer: Option B. -> Lower
Question 779. 0. In nculear fission each neutron that causes fission releases
  1.    No new neutron
  2.    At least one new neutron
  3.    One new neutron
  4.    More than one new neutrons
 Discuss Question
Answer: Option D. -> More than one new neutrons
Question 780. 2. Gas cooled reactor uses following materials as moderator, and coolant
  1.    Graphite, CO2
  2.    Graphite, air
  3.    Heavy water, CO2
  4.    Lead, H2
 Discuss Question
Answer: Option A. -> Graphite, CO2

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