Lakshya Education MCQs

Question: Pick out the wrong statement.
A.Atoms with same number of nucleons but different number of protons are called isobars
B.Atoms with same number of protons but different number of nucleons are called isoters
C.Out of α, β, and γ-rays, the one having maximum penetration power are γ-rays
D.The product formed by emission of ?-particle has mass number less by 4 units than the parent nuclide
Answer: Option B

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Question 1. Percentage of natural uranium present in uranium ore found in Jadugoda (Jharkhand) is
  1.    0.1
  2.    1
  3.    3
  4.    12
Answer: Option A
Question 2. Unit of radioactivity is
  1.    Barn
  2.    Fermi
  3.    Angstrom
  4.    Curie
Answer: Option D
Question 3. A fast breeder reactor employs
  1.    Graphite as moderator
  2.    Water as coolant
  3.    Molten sodium as coolant as well as moderator
  4.    U-235 as fuel
Answer: Option D
Question 4. Solar energy results from __________ reaction.
  1.    Fission
  2.    Combustion
  3.    Thermonuclear
  4.    None of these
Answer: Option C
Question 5. The number of neutrons in the nucleus of Uranium⁻²33 (92U233) is
  1.    141
  2.    92
  3.    233
  4.    325
Answer: Option A
Question 6. Fast breeder nuclear reactors using enriched uranium as fuel may contain upto a maximum of __________ percent of U-235 (i.e. fissile material).
  1.    15
  2.    45
  3.    65
  4.    85
Answer: Option D

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