Lakshya Education MCQs

Question: Fast breeder nuclear reactors using enriched uranium as fuel may contain upto a maximum of __________ percent of U-235 (i.e. fissile material).
Options:
A.15
B.45
C.65
D.85
Answer: Option D

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Question 1. The number of neutrons in the nucleus of Uranium⁻²33 (92U233) is
  1.    141
  2.    92
  3.    233
  4.    325
Answer: Option A
Question 2. Solar energy results from __________ reaction.
  1.    Fission
  2.    Combustion
  3.    Thermonuclear
  4.    None of these
Answer: Option C
Question 3. Pick out the wrong statement.
  1.    Atoms with same number of nucleons but different number of protons are called isobars
  2.    Atoms with same number of protons but different number of nucleons are called isoters
  3.    Out of α, β, and γ-rays, the one having maximum penetration power are γ-rays
  4.    The product formed by emission of ?-particle has mass number less by 4 units than the parent nuclide
Answer: Option B
Question 4. Thorium can be converted into U-233 in a __________ reactor.
  1.    Liquid metal cooled
  2.    Fast breeder
  3.    Thermal
  4.    Swimming pool
Answer: Option B
Question 5. The ratio of atomic radius to its nuclear radius is about
  1.    10⁵
  2.    10⁸
  3.    10¹²
  4.    10¹⁵
Answer: Option A
Question 6. Critical energy should be __________ the neutron binding energy of the atom in order to initiate a nuclear fission.
  1.    Equal to
  2.    Less than
  3.    More than
  4.    Either more or less
Answer: Option C

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