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MCQs

Total Questions : 943 | Page 91 of 95 pages
Question 901. Isotopes of an element have different
  1.    Nuclear charge
  2.    Mass number
  3.    Electronic configuration
  4.    Chemical properties
 Discuss Question
Answer: Option B. -> Mass number
Question 902. Which is used as a coolant in nuclear reactor due to its high capture cross-section?
  1.    N₂
  2.    He
  3.    H₂
  4.    CO₂
 Discuss Question
Answer: Option C. -> H₂
Question 903. Liquid metal (e.g, . molten sodium) is preferred as a coolant in case of a/an __________ reactor.
  1.    Enriched uranium (3% U-235) fuelled
  2.    Homogeneous
  3.    Fast breeder
  4.    Graphite moderated
 Discuss Question
Answer: Option C. -> Fast breeder
Question 904. Radioactive decay of a material involves a __________ order reaction.
  1.    Second
  2.    First
  3.    Third
  4.    Zero
 Discuss Question
Answer: Option B. -> First
Question 905. Ordinary water is not used as a moderator because, it
  1.    Does not absorb neutrons
  2.    Has a low scattering cross-section
  3.    Has a low absorption cross-section
  4.    Absorbs neutrons
 Discuss Question
Answer: Option D. -> Absorbs neutrons
Question 906. Mass of a positron is same as that of a/an
  1.    Proton
  2.    α-particle
  3.    Electron
  4.    Neutron
 Discuss Question
Answer: Option C. -> Electron
Question 907. __________ moderator is used in a fast breeder reactor.
  1.    Beryllium
  2.    Graphite
  3.    Heavy water
  4.    No
 Discuss Question
Answer: Option D. -> No
Question 908. __________ nuclear reactor does not require a heat exchanger to supply steam to power turbine.
  1.    Helium cooled
  2.    Boiling water
  3.    Pressurised water
  4.    Molten sodium cooled
 Discuss Question
Answer: Option B. -> Boiling water
Question 909. Critical mass is the minimum mass of nuclear fissile material required for the
  1.    Sustainment of chain reaction
  2.    Economic power generation
  3.    None of these
  4.    Power generation on commercial scale
 Discuss Question
Answer: Option A. -> Sustainment of chain reaction
Question 910. The mass number of an element is not changed, when it emits __________ radiations.
  1.    β & γ
  2.    α & β
  3.    γ & α
  4.    α, β, & γ
 Discuss Question
Answer: Option A. -> β & γ

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