Lakshya Education MCQs

Question: Half life of a radioactive isotope corresponds to the time required for half of the following to decay
Options:
A. Electrons
B. Protons
C. Neutrons
D. Atom
Answer: Option D
Explanation :

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Question 1. The energy released during the fission of one atom of uranium 235 in million electron volts is about
  1.     100
  2.     200
  3.     300
  4.     400
Answer: Option B
Explanation :
Question 2. When a reactor becomes critical, then the production of neutrons is
  1.     Infinite
  2.     Zero
  3.     Exactly balanced by the loss of neutrons through leakage
  4.     Initiated
Answer: Option C
Explanation :
Question 3. Plutonium is produced
  1.     As basic raw material
  2.     By neutron irradiation of Uz
  3.     By neutron irradiation of thorium
  4.     Artificially
Answer: Option B
Explanation :
Question 4. In triggering fission, the following types of neutrons are desirable
  1.     Fast moving
  2.     Slow moving
  3.     Critical neutrons
  4.     Neutrons at rest
Answer: Option B
Explanation :
Question 5. The energy released during the fission of one atom of uranium 235 in million electron volts is about
  1.     100
  2.     200
  3.     300
  4.     400
Answer: Option B
Explanation :
Question 6. Plutonium is produced
  1.     As basic raw material
  2.     By neutron irradiation of Uz
  3.     By neutron irradiation of thorium
  4.     Artificially
Answer: Option B
Explanation :

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