250+ TOP MCQs on Chain Reaction and Nuclear Reactors and Answers

Power Plant Engineering Multiple Choice Questions on “Chain Reaction and Nuclear Reactors”.

1. The atomic weight and atomic number of an element are A and Z respectively. What is the number of neutrons in the atom of that element?
a) Z
b) A
c) A+Z
d) A-Z
Answer: d
Clarification: Number of neutrons = Atomic weight – Atomic number.

2. The time required for half of the __________ of a radioactive isotope to decay is called its half-life.
a) neutron
b) electron
c) proton
d) nuclei
Answer: d
Clarification: The time required for half of the nuclei of a radioactive isotope to decay is called its half life.

3. Thermal nuclear reactors using enriched uranium as fuel contains a maximum of __________ percent fissile material i.e. U-235.
a) 1
b) 2
c) 3
d) 6
Answer: c
Clarification: Thermal nuclear reactors using enriched uranium as fuel contains a maximum of 6 percent fissile material i.e. U-235.

4. __________ moderator is used in a fast breeder reactor.
a) Heavy water
b) Graphite
c) No
d) Beryllium
Answer: c
Clarification: A fast breeder reactor doesn’t employ any moderator.

5. Nuclides having the same atomic number are termed as?
a) Isobars
b) Isotones
c) Isotopes
d) Isomers
Answer: d
Clarification: Isomers are nuclides having the same atomic number.

6. Main source of __________ is monazite sand.
a) Uranium
b) Polonium
c) Halfnium
d) Thorium
Answer: d
Clarification: Thorium is the main source of Monazite Sand.

7. Emission of β-particles during radioactive decay of a substance is from __________
a) nucleus
b) innermost shell
c) outermost shell
d) none of the mentioned
Answer: a
Clarification: Emission of β-particles during radioactive decay of a substance is from the nucleus as all emissions are nuclear phenomenon.

8. A fertile material is the one, that can be __________
a) converted into fissile material on absorption of neutron
b) fissioned by either slow or fast neutrons
c) fissioned by slow (thermal) neutrons
d) fissioned by fast neutrons
Answer: a
Clarification: A fertile material is the one, which can be converted into fissile material on absorption of neutron.

9. The half-life period of a radioactive element depends on its __________
a) temperature
b) pressure
c) amount
d) none of the mentioned
Answer: d
Clarification: The half-life is independent of the mentioned factors.

10. Which is radioactive in nature?
a) Helium
b) Deuterium
c) Tritium
d) Heavy Hydrogen
Answer: c
Clarification: Tritium is a radioactive element.

11. Which is the most commonly used nuclear fuel in boiling water reactor?
a) enriched uranium
b) plutonium
c) natural uranium
d) monazite sand
Answer: a
Clarification: Enriched uranium is the most commonly used nuclear fuel in boiling water reactor.

12. Enrichment of uranium is done to increase the concentration of __________ in the natural uranium.
a) U-235
b) U-233
c) U-238
d) PU-239
Answer: a
Clarification: Enrichment of uranium is done to increase the concentration of U-235 in the natural uranium.

13. Fuel for a nuclear reactor (thermal) is _____________
a) Uranium
b) Plutonium
c) Radium
d) None of the mentioned
Answer: a
Clarification: Uranium is the fuel for a thermal reactor.

14. The first underground nuclear test was conducted by India at _____________
a) Pokhran
b) Kalpakkam
c) Jaisalmer
d) Narora
Answer: a
Clarification: Pokhran had the very first underground nuclear test.

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