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MCQs

Total Questions : 943 | Page 1 of 95 pages
Question 1. Which of the following gases has very high neutron capture cross-section, making it unsuitable as a coolant in nuclear reactor?
  1.    N₂
  2.    He
  3.    CO₂
  4.    H₂
 Discuss Question
Answer: Option A. -> N₂
Question 2. Heavy water (D₂O) in a nuclear reactor serves as a
  1.    Coolant
  2.    Moderator
  3.    Both A & B
  4.    Neutron absorber
 Discuss Question
Answer: Option C. -> Both A & B
Question 3. Moderating material used in a thermal-reactor should be a
  1.    Good absorber of neutrons
  2.    Solid substance
  3.    Poor absorber of neutrons
  4.    None of these
 Discuss Question
Answer: Option C. -> Poor absorber of neutrons
Question 4. The 92U238 emits an a-particle. The product is
  1.    90U234
  2.    90U238
  3.    90U236
  4.    92U236
 Discuss Question
Answer: Option A. -> 90U234
Question 5. Nuclear fuel generally used in reactors is uranium oxide instead of uranium, because the former has higher
  1.    Melting point, hence can be subjected to higher temperature
  2.    Density ; hence core volume for a given power output would be smaller
  3.    Resistance to effects of irradiation
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 6. __________ have the same mass number, but different nuclear charge.
  1.    Isotopes
  2.    Isobars
  3.    Isotones
  4.    None of these
 Discuss Question
Answer: Option B. -> Isobars
Question 7. Water is a better coolant than a gas (like CO₂, He, N₂ etc.), because it
  1.    Is a better neutron moderator as well
  2.    Requires comparatively smaller pumps and heat exchanger for a given heat transfer rate
  3.    Has a better heat transfer characteristics, and it can be pressurised to attain a high temperature
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 8. Which is the most commonly used molten metal for cooling of nuclear reactors?
  1.    Calcium
  2.    Sodium
  3.    Mercury
  4.    Zinc
 Discuss Question
Answer: Option B. -> Sodium
Question 9. Radioactive decay is a __________ change.
  1.    Chemical
  2.    Nuclear
  3.    Physical
  4.    None of these
 Discuss Question
Answer: Option B. -> Nuclear
Question 10. Heavy water used in the nuclear reactors to slow down the speed of neutrons is
  1.    Highly purified water
  2.    A compound of oxygen and deuterium
  3.    Water having dissolved salts of heavy metals
  4.    None of these
 Discuss Question
Answer: Option B. -> A compound of oxygen and deuterium

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