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MCQs

Total Questions : 943 | Page 6 of 95 pages
Question 51. In a homogeneous nuclear reactor, the __________ are mixed together.
  1.    Fuel & coolant
  2.    Fuel & moderator
  3.    Coolant & moderator
  4.    None of these
 Discuss Question
Answer: Option B. -> Fuel & moderator
Question 52. An electron has a mass that is approximately __________ that of the proton.
  1.    1836 (approximately)
  2.    1/1836 (approximately)
  3.    1
  4.    ∞
 Discuss Question
Answer: Option B. -> 1/1836 (approximately)
Question 53. Nucleus of 92U235 contains __________ protons.
  1.    92
  2.    235
  3.    143
  4.    325
 Discuss Question
Answer: Option A. -> 92
Question 54. Thermal neutrons which are used to cause the fission of U-235 have energy __________ eV.
  1.    < 0.025
  2.    > 1
  3.    1-25
  4.    > 200
 Discuss Question
Answer: Option A. -> < 0.025
Question 55. Primary purpose of a __________ nuclear reactor is to supply a high neutron flux of the order of 10¹³ to 10¹⁴ neutrons/cm² second.
  1.    Research
  2.    Power
  3.    Breeder
  4.    Homogeneous
 Discuss Question
Answer: Option A. -> Research
Question 56. Velocity of the thermal neutron (< 0.025 eV) used for fission of U-235 is around __________ m/sec.
  1.    1
  2.    2200
  3.    3 x 10¹¹
  4.    9 x 10²¹
 Discuss Question
Answer: Option B. -> 2200
Question 57. Atoms of U-238 and U-235 differ in structure by three
  1.    Electrons and three protons
  2.    Protons
  3.    Neutrons
  4.    Electrons
 Discuss Question
Answer: Option C. -> Neutrons
Question 58. Candu reactor is a __________ nuclcear reactor.
  1.    Natural uranium fuelled heavy water cooled & moderated
  2.    Highly enriched uranium (85% U-235) fuelled
  3.    Homogeneous
  4.    Fast breeder
 Discuss Question
Answer: Option A. -> Natural uranium fuelled heavy water cooled & moderated
Question 59. Percentage of U-238 in natural uranium is around
  1.    0.71
  2.    99.29
  3.    0.015
  4.    29.71
 Discuss Question
Answer: Option B. -> 99.29
Question 60. A control rod
  1.    Should have small absorption cross-section
  2.    Is generally made of boron, hafnium or cadmium
  3.    Should have large absorption cross-section
  4.    Both B and C
 Discuss Question
Answer: Option D. -> Both B and C

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