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MCQs

Total Questions : 807 | Page 11 of 81 pages
Question 101. The following present serious difficulty in designing reactor shield
  1.    Alpha particles
  2.    Beta particles
  3.    Thermal neutrons
  4.    Fast neutrons and gamma rays
 Discuss Question
Answer: Option D. -> Fast neutrons and gamma rays
Question 102. The most commonly used moderator in nuclear plants is
  1.    Heavy water
  2.    Concrete and bricks
  3.    Graphite and concrete
  4.    Graphite
 Discuss Question
Answer: Option D. -> Graphite
Question 103. Uranium has isotopes
  1.    U₂₃₄
  2.    U₂₃₅
  3.    U₂₃₈
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 104. Breeder reactor has a conversion ratio of
  1.    Unity
  2.    More than unity
  3.    Less than unity
  4.    Zero
 Discuss Question
Answer: Option B. -> More than unity
Question 105. Hydrogen is preferred as better coolant in comparison to CO₂ because former
  1.    Is lighter
  2.    Is inert
  3.    Has high specific heat
  4.    Is a good conductor
 Discuss Question
Answer: Option C. -> Has high specific heat
Question 106. Half life of a radioactive isotope corresponds to the time required for half of the following to decay
  1.    Electrons
  2.    Protons
  3.    Neutrons
  4.    Atom
 Discuss Question
Answer: Option D. -> Atom
Question 107. When a reactor becomes critical, then the production of neutrons is
  1.    Infinite
  2.    Zero
  3.    Exactly balanced by the loss of neutrons through leakage
  4.    Initiated
 Discuss Question
Answer: Option C. -> Exactly balanced by the loss of neutrons through leakage
Question 108. Plutonium is produced
  1.    As basic raw material
  2.    By neutron irradiation of Uz
  3.    By neutron irradiation of thorium
  4.    Artificially
 Discuss Question
Answer: Option B. -> By neutron irradiation of Uz
Question 109. The energy released during the fission of one atom of Uranium 235 in million electron volts is about
  1.    100
  2.    200
  3.    300
  4.    400
 Discuss Question
Answer: Option B. -> 200
Question 110. In triggering fission, the following types of neutrons are desirable
  1.    Fast moving
  2.    Slow moving
  3.    Critical neutrons
  4.    Neutrons at rest
 Discuss Question
Answer: Option B. -> Slow moving

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