250+ TOP MCQs on Nuclear Fission and Answers

Power Plant Engineering Multiple Choice Questions on “Nuclear Fission”.

1. What is the function of moderators in nuclear reactor?
a) absorb the secondary neutrons
b) slow down the secondary neutrons
c) control the chain reaction
d) none of the mentioned
Answer: b
Clarification: The function of moderators in nuclear reactor is to slow down the secondary neutrons.

2. Which of the following is not used as a nuclear fuel cladding material?
a) Cadmium
b) Zircalloy
c) Ceramics
d) Stainless Steel
Answer: a
Clarification: Cadmium is not used as a nuclear fuel cladding material.

3. Nuclear fuel complex, Hyderabad is engaged in the job of __________
a) processing of uranium ore
b) manufacture of nuclear fuel elements/assemblies
c) treatment of spent fuel
d) none of the mentioned
Answer: b
Clarification: The Hyderabad complex is involved in the manufacturing of nuclear fuel elements.

4. Which one is different for the neutral atoms of the isotopes of an element?
a) Number of electrons
b) Atomic weight
c) Atomic number
d) Number of Protons
Answer: b
Clarification: The isotopes are atoms of the same element but with a different atomic weight.

5. Thorium can be converted into U-233 in a __________ reactor.
a) fast breeder
b) liquid metal reactor
c) curtis reactor
d) none of the mentioned
Answer: a
Clarification: Fast breed reactors are used to convert Thorium into U-233.

6. A moderator ______ the neutrons.
a) accelerates
b) slows down
c) blocks
d) stops
Answer: b
Clarification: The function of a moderator is to slow down fast moving neutrons thus controlling the extent of fission reaction.

7. __________ nuclear reactor does not require a heat exchanger to supply steam to power turbine.
a) pressurised water
b) boiling water
c) helium cooled
d) molten sodium cooled
Answer: b
Clarification: Boiling water nuclear reactor does not require a heat exchanger to supply steam to power turbine.

8. If 4 gm of a radioisotope has a half-life period of 10 days, the half-life of 2 gm of the same istotope will be __________ days.
a) 10
b) 5
c) 20
d) 30
Answer: a
Clarification: Applying Radioactive Decay law.

9. Thermal neutrons which are used to cause the fission of U-235 have energy __________ eV.
a) >1
b) <0.025
c) >200
d) 1-25
Answer: b
Clarification: Thermal neutrons which are used to cause the fission of U-235 have energy < 0.025 eV.

10. Pick out the wrong statement.
a) Positron is heavier than a proton
b) A, β-ray particle is identical with an electron
c) The nucleus of a hydrogen atom is identical with a proton
d) Mass of an electron is about 1/1800th of the lightest nucleus
Answer: a
Clarification: Positron is lighter than a proton.

11. Specific gravity of uranium and plutonium is about __________
a) 13
b) 9
c) 19
d) 27
Answer: c
Clarification: Specific gravity of Uranium & Plutonium is about 19.

12. Which of the following types of nuclear reactors is most prone to radioactive hazards?
a) Gas cooled reactor
b) Molten Sodium Reactor
c) Boiling water reactor
d) Pressurised water reactor
Answer: c
Clarification: Boiling water reactor is the most prone to radioactive hazards.

13. The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about __________ metres/second.
a) 1100
b) 2200
c) 3300
d) 4400
Answer: b
Clarification: The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about 2200 m/sec.

14. Radioactive decay is a ________ change.
a) Physical
b) Chemical
c) Nuclear
d) None of the mentioned
Answer: c
Clarification: Radioactive decay is a nuclear phenomenon.

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