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MCQs

Total Questions : 943 | Page 9 of 95 pages
Question 81. The main ore of thorium is
  1.    Pitchblende
  2.    Monazite sand
  3.    Limonite
  4.    Galena
 Discuss Question
Answer: Option B. -> Monazite sand
Question 82. The main ore of uranium is
  1.    Pitchblende
  2.    Monazite sand
  3.    Cassiterite
  4.    Chalcopyrite
 Discuss Question
Answer: Option A. -> Pitchblende
Question 83. In β-decay of radioactive material, the ratio of neutron to proton
  1.    Increases
  2.    Remains same
  3.    Decreases
  4.    Is unpredictable; may increase or decrease
 Discuss Question
Answer: Option C. -> Decreases
Question 84. A radioactive isotope undergoes decay with respect to time following __________ law.
  1.    Logarithmic
  2.    Exponential
  3.    Linear
  4.    Inverse square
 Discuss Question
Answer: Option B. -> Exponential
Question 85. Thorium metal
  1.    Resembles steel in appearance
  2.    Is less hard (in the range of silver)
  3.    Is highly ductile
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 86. 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
 Discuss Question
Answer: Option C. -> More than
Question 87. The ratio of atomic radius to its nuclear radius is about
  1.    10⁵
  2.    10⁸
  3.    10¹²
  4.    10¹⁵
 Discuss Question
Answer: Option A. -> 10⁵
Question 88. Thorium can be converted into U-233 in a __________ reactor.
  1.    Liquid metal cooled
  2.    Fast breeder
  3.    Thermal
  4.    Swimming pool
 Discuss Question
Answer: Option B. -> Fast breeder
Question 89. 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
 Discuss Question
Answer: Option D. -> 85
Question 90. The number of neutrons in the nucleus of Uranium⁻²33 (92U233) is
  1.    141
  2.    92
  3.    233
  4.    325
 Discuss Question
Answer: Option A. -> 141

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