141. The first underground nuclear test was conducted by India at
Jaisalmer
Pokharan
Kalpakkam
Narora
✅ The correct answer is option B.
Nuclear Power Engineering MCQs
142. Which of the following is not a good moderating material ?
Concrete
Boron
18/8 stainless steel
All (a), (b) and (c)
✅ The correct answer is option D.
143. Thermal shield is used in high powered nuclear reactors to
protect the walls of the reactor from radiation damage.
absorb the fast neutrons.
slow down the secondary neutrons.
protect the fuel element from coming in contact with the coolant.
✅ The correct answer is option A.
144. Number of secondary neutron emitted on fission of an atom of U-235 by slow neutron bombardment is
3
235
200
92
✅ The correct answer is option A.
145. The most commonly used nuclear fuel in boiling water reactor is
enriched uranium
natural uranium
plutonium
monazite sand
✅ The correct answer is option A.
146. Mass of a positron is same as that of a/an
electron
α-particle
proton
neutron
✅ The correct answer is option A.
147. Which of the following is a fuel for a fusion reactor (thermonuclear reactor) ?
Deuterium and tritium
U-233
Thorium
Heavy water
✅ The correct answer is option A.
148. Graphite is used in nuclear reactor as
insulation lining of the reactor.
fuel.
lubricant.
retarder of neutron velocity.
✅ The correct answer is option D.
149. “Critical mass” is the minimum mass of nuclear fissile material required for the
sustainment of chain reaction.
power generation on commercial scale.
economic power generation.
none of these.
✅ The correct answer is option A.
150. The mass number of an element is equal to the number of __________ in the nucleus.
electrons
neutrons
protons
neutrons plus protons (i.e., nucleons)
✅ The correct answer is option D.