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MCQs

Total Questions : 943 | Page 5 of 95 pages
Question 41. Absorption/scattering cross-section of an element is expressed in "barn", which is equivalent to
  1.    10⁻²⁴ cm²
  2.    10⁻¹² cm
  3.    1 Angstrom
  4.    10⁻²⁴ cm
 Discuss Question
Answer: Option A. -> 10⁻²⁴ cm²
Question 42. U-235 content in enriched uranium, that is normally used in power reactors (e.g., at Tarapur atomic power plant), is about __________ percent.
  1.    85
  2.    50
  3.    3
  4.    97
 Discuss Question
Answer: Option C. -> 3
Question 43. Thorium⁻²32 (a fertile material) on absorption of a neutron gets converted into __________ , which is a fissile material.
  1.    Thorium⁻²33
  2.    Uranium⁻²35
  3.    Uranium⁻²33
  4.    Plutonium⁻²39
 Discuss Question
Answer: Option C. -> Uranium⁻²33
Question 44. In the nuclear reaction, 93N239 → 93Pu239 + ?; the missing particle is a/an
  1.    Electron
  2.    Proton
  3.    Neutron
  4.    Position
 Discuss Question
Answer: Option A. -> Electron
Question 45. Enrichment of uranium is done to increase the concentration of __________ in the natural uranium.
  1.    U-238
  2.    U-233
  3.    U-235
  4.    Pu-239
 Discuss Question
Answer: Option C. -> U-235
Question 46. The amount of a radioactive material (having a half life of 100 years) remaining after 400 years will be __________ of its original weight.
  1.    1/2
  2.    1/4
  3.    1/8
  4.    1/16
 Discuss Question
Answer: Option D. -> 1/16
Question 47. Biological shield is provided in a nuclear power reactor to protect the __________ from radiation damage.
  1.    Fuel elements
  2.    Operating personnels
  3.    Walls of the reactor
  4.    None of these
 Discuss Question
Answer: Option B. -> Operating personnels
Question 48. Biological shield is provided in a nuclear power reactor to protect the __________ from radiation damage.
  1.    Fuel elements
  2.    Operating personnels
  3.    Walls of the reactor
  4.    None of these
 Discuss Question
Answer: Option B. -> Operating personnels
Question 49. In nuclear reactions, __________ number is conserved.
  1.    Mass
  2.    Atomic
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both A & B
Question 50. The atomic number of an element is equal to the number of __________ present in its atom.
  1.    Neutrons
  2.    Electrons
  3.    Protons
  4.    Either B or C
 Discuss Question
Answer: Option D. -> Either B or C

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